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The Mild Bunch
Part 1: 7mm

September 2007
Dan Martinez

The Mild Bunch
Left to right: Custom Remington 700 VLS in .260 Rem., Browning
Stainless Stalker A-Bolt in .260 Rem., Browning CompositeStalker
in .243 Win., Browning Micro Hunter in 7mm-08, Browning Micro
Hunter in .260 Rem., Remington Model 600 in 6mm Remington.

Several years back, I picked up a Sako Hunter in 7mm Rem. Mag. for a decent price. It features a 25ĹĒ barrel, a wonderfully ergonomic stock made out of a really nice piece of walnut, and it has a truly angelic trigger pull. The Sako got to go on two deer hunts with me, but without getting the opportunity to take game.

But I was never really happy with the rifle. On good days, it would group five shots under an inch, but on another day, same load, nothing else changed, it would shoot a two-inch-plus group. Thatís the kind of performance that can really sour the trust you have in a gun at the moment you need it to shoot right.

There were other things too, primarily the length and weight of the piece. Like I said above, the stock is an ergonomic masterpiece. It has a very comfortable palm swell which aids your hold when squeezing the trigger, and the comb of the stock meets your cheek perfectly as you hold to make the shot. But the rifle is long and it carries a slightly heavier than standard contour barrel. The rifle gets really heavy after a day of humping the deer hills.

I tend to carry a heavy daypack filled with lots of water and other fluids, an MRE for lunch, raingear, various electronic gadgets for navigation, rangefinding, and communication, and other whatnots. Iím constantly trying to figure out how to pare the weight in my pack. Usually when I find a better, lighter solution to something Iíve been carrying, I find something else to add that I just HAVE to take with me. The upshot is that it I never seem to be able to lose weight in my daypack. Add this big rifle to my heavy daypack and you can see how my field mobility might be seriously impaired.

Thatís the main reason that the 7mm Mag hasnít seen that many days in the field with me. I usually prefer to carry a lighter standard- or short-action sporter.

On one scouting trip, I got to carry a Browning Micro Hunter in .260 Rem. Iíve written about this rifle before. Itís the one my youngest son Sam usually hunts with. Itís really a compact rifle, not exactly a youth rifle. Most so-called youth rifles are made rather cheaply with a shortened birch or plastic stock and an 18Ē barrel. The Micro Hunter does have a shortened length of pull, but not so much that a big guy like me feels crowded. The barrel is shorter than standard at 20Ē, but does not give up the velocity that an 18Ē barrel does. And the stock is made out of a nice piece of genuine walnut, not birch or plastic. The forend of the stock is slightly abbreviated and the stock is turned to overall slimmer proportions.

Because the Micro Hunter is so trim and light, and is easily one-handed, it is a real joy to carry in the field. Yet, because it can be had chambered for some pretty serious cartridges, you never have to feel under-ranged with this little carbine. This year the Micro Hunter is chambered for .22 Hornet, .22-250, .243 Win., 7mm-08, .308 Win., .270 WSM, 7mm WSM, .300 WSM, and .325 WSM.

But alas, because we usually have our .260 Micro Hunter zeroed-in for some Sammy load, rather than for a load that I would hunt with given my druthers, I never really get a chance to use this gun. So I started thinking that I might like to have my very own Micro Hunter, one I wouldnít have to share with the kid. I was thinking one in .308 might be nice.

So one evening, I was sort of absent-mindedly browsing the internet gun auction sites, AuctionArms.com and Gunbroker.com, as is my occasional habit. There was no extra wad of cash in my bank account that I could use to buy a gun anyway, let alone any more room in the abode to store it. I typed in the search term, ďMicro HunterĒ to see what was out there. One offering caught my eye.

Someone was selling a new-in-box Micro Hunter in 7mm-08. OK, seven-O-eight is cool. But the important thing about this listing was that they said they were willing to entertain trades. I shot off a very short email offering up the Sako. I told them that it had been hunted with, so it did have a few scuffs and bruises, but I said that it was still in about 90% condition. Any interest?

They said yeah, maybe, send some pictures. So after a number of emails back-and-forth, offers and counter-offers, the deal was sealed. The Sako 7mm Mag was on its way to Texas, and a 7mm-08 Micro Hunter was on its way to Arizona (following all federal and local laws, of course). From wild to mild, I downsized my only 7mm just like that.

Shortly after receiving the new Micro7, the thought occurred to me that somehow over the years I had now accumulated a number of rifles chambered for middle-sized, mid-power cartridges that could be characterized as ďThe Mild Bunch,Ē and the idea for this series of articles was born.

What is The Mild Bunch?

This time around weíll be exploring the 7mm bore size. Future installments will key-in on the 6.5mm and 6mm calibers. But first, what are the general boundaries which for me, define The Mild Bunch?

While its certainly true that the various .22 caliber centerfires can be considered mild in recoil and a hoot to shoot, Iím focusing on cartridges which are at least deer-capable. Yes I know that the more powerful .22s are used by some on deer, but I share the general opinion of most hunters that the .22 calibers are too small for deer.

So that sets the minimum caliber boundary for The Mild Bunch at .243 or 6mm. Now what about case size? I think a deer-capable case in 6mm starts with a case based on the standard set by the 7mm or 8mm Mauser head size. Of course to you Americans, thatís the same as the .308 or .30-06. With a heavy enough bullet, wildcat 6mms based on a .223-class case size are probably powerful enough for deer at short range, and definitely enough for smaller big game like javelina. But practically speaking, if we limit ourselves to factory cartridges, that means that The Mild Bunch starts with the .243 Winchester.

At the upper end of caliber size, I am excluding .30 cal. This sets the upper limit at 7mm bullets. As for case size, I would exclude cartridges based on the .30-06 length case and any case of similar powder capacity. This effectively limits The Mild Bunch at the upper end to the ďx57Ē case size, such as the 6mm Remington, the .257 Roberts, and the 7mm Mauser (7x57). The new Winchester Super Shorts (WSSM) fit into The Mild Bunch club because their case capacity is just about identical to the x57 case. The WSSMs are lesser in case capacity than .30-06 class cartridges such as the .270 Win. and the .280 Rem. These longer, more powerful cartridges are excluded from The Mild Bunch, even though their caliber is under .30.

So what is it exactly, that makes The Mild Bunch worthy of defining as a group and talking about? In one word, fun ó fun to shoot. More to the point, comfortable to shoot. Yet, they crank out enough velocity, and carry enough bullet weight that you are definitely commanding serious power when you trip the sear on a Mild Bunch rifle. Thatís the key. Power, accuracy, reasonably flat trajectory, but with the comfort that allows you to shoot all day without hurting yourself.

Getting back to the point that started me down this path, rifles chambered for Mild Bunch cartridges can be made smaller and lighter, thus easy-carrying in the field. Since the cases are smaller in capacity than standard sized cartridges (read ď.30-06 lengthĒ), the ballistic penalty for a shorter, handier barrel is less. Plus Mild Bunch cartridges based on the .308 case size are made on short actions, which also contributes to rifle downsizing.

The 7mm-08 Micro Hunter

OK? Now that you understand the general idea behind The Mild Bunch, itís time to get into specifics. I donít own or have access to any .25 caliber Mild Bunch guns, so Iím going to have to skip discussion of them in this series. I also donít have a 6.8 SPC, the only .270 caliber Mild Bunch cartridge I can think of, so I canít talk much about that either. I do have 6mms, 6.5mms, and now a 7mm Mild Bunch rifle that I can discuss though.

Iím going to start with my newest rifle, the 7mm-08 Micro Hunter, since thatís the one Iíve been playing with the most lately. The fall draw results for deer recently came out, and when the news is positive, as it was for me this year, my focus shifts away from summer activities and naturally turns to ballistics and rifle practice. With the arrival of the Micro7, plans were immediately made to use this as the primary rifle for my hunt.

Now that it had arrived, the first decision was how to scope it. We scoped Samís .260 Micro with a Weaver K6 fixed 6x38mm scope. The thinking was that small, light, and simple is best for what is supposed to be a light and handy carbine. Thatís certainly the path I was heading down when I started shopping for a scope for the Micro7.

But before ordering the Weaver, I decided to see what Leupold had to offer in the way of fixed-sixes. (We may be having a talk about fixed-sixes some time in the future, too.) In the FX-II series, Leupold offers a 6x36, but new for this year, the scope is available with their Long Range Duplex ballistic reticle.

The LRD reticle features two extra dots below the central crosshair at specifically defined MOA values to give you additional aim points for longer range shots. After discovering this scope, there was simply no other choice!

Leupold Long Range Duplex Reticle
The next order of business was figuring out what to shoot out of it. At the time that I picked the rifle up from Randallís Firearms where I had the rifle shipped, I also picked up 50 empty 7mm-08 cases, a set of Hornady dies for it, and a box of 140 grain Remington green-box factory ammo.

Looking over my small assortment of leftover bullets from the days of loading 7mm Mag, I found 140 grain Nosler Ballistic Tips, 120 grain Barnes Triple-Shock X Bullets, and 140 grain Sierra Gameking boat-tail softpoints. To that selection, I threw in a fresh box of 130 grain Speer Hot-Cor softpoints.

Upon perusing the loading manuals for recommended loads, I found that IMR 4064 is an almost ideal powder for the seven-O-eight in typical deer hunting bullet weights (120 grain to 140 grain). This is great since I buy IMR 4064 in the 8 pound jugs. I use this powder almost exclusively for all the different old military calibers that I load for.

I ended up assembling ten different loads using the bullets I had, all loaded with IMR 4064, 5 rounds of each load. The plan was to fire them for velocity and group size. I wanted to find out how the gun shot in general, and to see which of the loads might be the golden load for hunting purposes.

Downsizing my 7mm
7mm-08 on the left,
7mm Rem. Mag on the right.
I used the first 15 rounds out of the box of factory ammo to get a rough zero at 100 yards. I saved the last five to throw into the mix for load testing data.

One note about the overall loaded cartridge length for my handloads: I measured the factory rounds and found that they just fit in the Micro Hunterís magazine. That length was 2.745Ē. It has been my experience with other Browning A-Bolts, that the limiting factor for overall cartridge length is magazine space, not throat depth. So when assembling my loads I just went with the 2.745Ē length for everything.

The chart below lists the results. For the Nosler 140, the Barnes 120, and the Sierra 140, I loaded 40, 41, and 42 grain charges of IMR 4064 to plot the velocity change with charge increases. I didnít have enough leftover Nosler 140ís for this test, so I disassembled some of my leftover 7mm Mag rounds to recycle the bullets and the powder. This resulted in some tip damage to some of the Nosler bullets. So itís possible that the Noslers would have grouped a little better if I used all fresh bullets.

An unexpected result concerning the Noslers is an increase in velocity from 40 to 41 grains of powder, but a velocity decrease from 41 to 42 grains! Huh? The bullet that shot the best overall is the 140 grain Sierra Gameking BTSP. The velocity standard deviation started small, and as powder charge increased, it kept decreasing. The Sierra book says that Iím still a couple tenths of a grain under the max load at 42.0 grains. The Speer bullet load also looks like a winner.


 
7mm-08 Browning Micro Hunter Load Test Data

Each of these is a sample of one Ė one group of five rounds per load. So really, any of the loads could show better for the next five-round group fired Ė or not. One could spend a lot of time shooting, verifying, and adjusting the loads to the Nth degree Ė or they could just pick a good one and get on with it! Thatís what Iím doing. The Sierra 140 grain bullet flying at 2735 fps into a group less than an inch is fine with me. Grouping with this load was the most satisfactory of all the loads tested. I did suffer a bad primer that didnít go off in this batch, so my final group size for the 42 grain charge is only for a four-round, instead of a five-round group. Still, the results look darn good.

So whatís next? Ballistic Reticle Analysis and sight-in of course! I went into all the gory details of ballistic reticle analysis in my February 2006 article, ďUnderstanding the Ballistic ReticleĒ, so Iím not going to dive deeply here. Check out the story on the website if you need a refresher.

The short version that Iíll give you here, is that with the chosen Sierra Gameking load, when the center crosshair is zeroed at 215 yards, the bullet should strike the first dot down at 300 yards, the second dot down at 390 yards, and the top of the 6 oíclock picket-post is the 485 yard hold point.

Do I really expect to be shooting out at 485 yards with a 6x scope? No. On the other hand, I have made first-shot e-Deer kills at over 400 yards with a 6x scope at our Buckhunterís Challenge shoots Ė and no, it wasnít mere luck. You might be surprised at what you can do with a 6x scope if youíve never tried one.

This load is fully capable of delivering more than adequate power for deer all the way out to 500 yards. It has 2300 ft-lbs. KE at the muzzle, and still over 1200 ft-lbs at 500 yards. As long as the load is accurate and velocity consistent, a ballistic reticle makes it possible. With a heavier bullet, from 150 to 160 grains, even elk (at more reasonable ranges) can be on the menu for the 7mm-08.

The 7x57 Mauser is very similar ballistically to the 7mm-08. These two are the strongest members of the Mild Bunch. Factory loads for the 7x57 are actually a little weaker than the 7-08 due to the many old military surplus rifles chambered for it. But handloaded for a modern bolt action, it will do anything that the 7mm-08 can do, maybe a little more. The advantage that the 7mm-08 holds is that it is usually seen in true short-action rifles, thus trim and light rifles like the Micro Hunter can be built around it.

Other members of the 7mm Mild Bunch are the 7mmBR and the 7-30 Waters. These 7mms are specialty cartridges. They are often seen in single-shot handguns, less often in rifles. If you want to know more about these, one of you guys will have to write the story, as I have no experience with either of them.

Well that wraps up my look at the mild 7mm rifle rounds. The next time around weíll take a look at the 6.5 millimeters. That may or may not be in the next newsletter, but weíll get there.

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