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7mm Allen Magnum finished.....

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Unread 11-08-2005, 02:08 PM
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Join Date: Jun 2004
Location: Fort Shaw, Montana
Posts: 6,848
Re: 7mm Allen Magnum finished.....


I would agree that the 200 gr ULD 7mm bullet is going to change the way we look at long range shooting. Just a few years ago it was a big 338 magnum with a 300 gr SMK as the end all of extreme range shooting.

Like you say, it takes a great deal of a round to get 300 gr of bullet up to speed. Not that it doesn't take a large 7mm to get a 200 gr ULD up to speed but recoil is much less.

Plus top velocity potential with the 7mm is much higher then even the largest conventional 338 magnums.

The 338 does have an advantage in Sectional Density but the 200 gr ULD still has a very high SD for great penetration on anything on this side of the ponds at .354.

I am very curious to see how my 338 Allen Mag performs this winter. Still, I suspect it will not offer alot more if any ballistically then the 7mm AM. Terminally, thats a different story.

I just took my 7mm AM out for its initial long range drop chart test. Used the following data for the drop chart with a 300 yard zero:

3100 fps
40 degrees F
29.92" BP
3000 ft alt.
.925 BC

Headed out to my shooting area and after the 4" of snow last night we are now getting warm temps and alot of wind, that equals a freakin MESS as its about 8 miles of dirt road to my favorite shooting spot.

Needless to say the truck is BROWN from top to bottom!!!

The wind was quartering from my 8:00 position. I found a quality target rock on the hill side and ranged it at 842 yards. On the drop chart this range lists -3.6 mils for a hold. I was not concerned about wind drift at this point, just wanted to get the vertical dialed in first.

Let the first shot go and she landed roughly a foot high and a foot or so to the right. Took a bit out of the elevation and sent another 200 gr toward the rock. Again I was not correcting for wind at this point. This second shot was again roughly a foot to the right but only an inch or two high of the center line of my aiming point.

Took another shot with the same hold and mud slattered from the same hole.

Next to test the drop chart out I found a smaller rock in the stubble field, roughly 6" thick. Ranged it at 374 yards. On the drop chart, the hold is listed as -0.4 mil.

I held the .5 hash line on the bottom edge of the rock and at the break of the trigger the rock simply disappeared into fine gravel.

This made me feel good. This shot was taken with the wind directly at my back. Now it was clear that the drop chart was very close to actual bullet flight from the muzzle to 375 yards to 840 yards.

I then found a rock at 693 yards, This was a very small rock laying in the middle of a dirt slide so it would give me a good bullet impact splash. -2.5 mils was the correct hold for 690 yards so I out that line on the top of the 3" white rock. It was a miss but a very close miss. I had held 0.5 mil into the wind as the chart listed 0.8 mil for a 90 degree 10 mph wind. The shot landed about 2" high and just an inch or so off the rock. Certainly a dead deer at that range easily.

I let the rifle cool for a bit while I fireformed some brass for my 257 AM which is also going on the hunt in a back up role.

Then decided I wanted to really test the drop chart which went to 1010 yards. I found a nice black rock sitting on the snow covered hill side. The range was 988 yards. Looked her up and the hold was -4.8 mils for a 990 yard range. The rock was roughly 8" tall by 12" long. I allowed 3/4 mil into the wind and bracketed the rock between the -4.5 hash and the bottom post.

Again, not a hit but dead on vertically and only a couple inches to the right, again, on the front shoulders of a 300 lb whitetail, IN THE TRUCK.

I am not 100% ready though. I want to get some calm shooting conditions and verify the horizontal zero. It seems to be very close but just want to make sure. Have a few day so this should not be a problem. As she sits now though I would take a 700 yard shot with no second guesses at all.

The big 200 gr ULD really spoils you as far as limited wind drift. At a full 1000 yards, its only 1.0 mil hold for a 10 mph 90 degree crosswind.

Recoil wise, its on line with a 243 varmint rifle, if that much. Most do not believe me about this but those that have shot them really will back me up on this, there is simply nothing as far as recoil to worry about.

One last thing, getting the 3.5-15x 50mm NXS was the best decision I have made in several years. Flat out awsome in every way and the smaller 50mm objective is perfect for getting that scope down for a comfortable shooting postion.

This rifle may become my go to rifle VERY QUICKLY!!

Kirby Allen(50)
Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

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Unread 11-08-2005, 03:39 PM
Join Date: Jun 2007
Location: Wyoming
Posts: 2,840
Warms my heart

I'm sure there was just a real good feeling after shooting today. A lot of time, thought, money and effort all coming together.
I am overjoyed that it matched up like you thought it would.
Just makes me even more excited for my little 7 to be in action.
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Unread 11-08-2005, 03:41 PM
Join Date: Jun 2007
Location: Wyoming
Posts: 2,840
Re: Warms my heart

On a side note, I can't wait to try it on a windy day at a 1k match [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Unread 11-08-2005, 04:10 PM
Platinum Member
Join Date: Jun 2005
Location: Yakima, Washington
Posts: 3,775
Re: 7mm Allen Magnum finished.....


Sounds like the drop chart and field testing is coming together nicely in time for your trip.

As to the recoil of the 7mm AM. Iíve had mine along side a standard weight Rem. 700 243 with 3-9 scope on it and the 7mm AM is much easier and far more comfortable to shoot. People donít believe it until they try it.

Iíve shot a lot of guns in many different calibers and configurations but have to say that my 7mm AM is the most comfortable, dead nuts on, easy to shoot gun Iíve ever had the pleasure to get behind. All you have to do is range the target, dial for the range, get set up on the bipod and rear bag and it just lays there and does its thing with deadly precision.

This is, in my opinion, quite possibly the best combination of bullet and cartridge available for hunting today. [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/smile.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]

I can easily understand your statement about how this could become your ďgo toĒ gun.

Glad to hear the Nightforce is working for you. They make an awesome scope. Iíve commented that watching the impact through mine is about like watching a big screen tv. Stuff just happens and animals drop.

That 200 grain Wildcat will drop any whitetail you find and do it with ease. Just listen for the unmistakable whack. Donít blink at the shot though or youíll miss it all. That pill gets on target at long range, and things happen very very quickly. [img]/ubbthreads/images/graemlins/grin.gif[/img]

Your comments about the wind drift are dead on. The 7mm AM with the 200 gr. Wildcat makes the wind a non-issue in most cases.

Finish your testing and enjoy your trip. Tell Richard hi and you guys have a safe and enjoyable hunt. Remember, lots of pics to go along with the story.
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Unread 11-08-2005, 08:25 PM
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Join Date: Jul 2001
Posts: 1,459
Re: 7mm Allen Magnum finished.....

Kirby, that's what I like to see, predictable 'linear' ballistics. I can see that you aren't going to need to dial up much with that reticle.

4.5mil X 3.6min/mil= 16.2 min to 990yds. That is nice and flat. I assume just a bit high for a 100yd zero (maybe 17.5 mins from a 100yds zero???). My 7RM and 162gr Amax at 3150fps needs about 18.5 to 19.5 mins to 1000yds (940yds is 17.5 so extrapolating to 1000yds). What type of rangefinder are you using?

When you generated your drop table, which G function did you use?

The most important thing is that the wind drift is really low. That matters more then just about anything in LRH. 1 mil of wind drift in that type of wind is superb.

For those not that familiar, run the numbers on a 175grMK from a 308. You are working way too hard to dope this cartridge.

A enormous benefit of that high BC is the retained velocity. That just ensures consistent bullet expansion and a good wound channel. Me guess Mr. Whitetail is not going to run far with a 4" exit hole.

Not too far at all.

Good luck on your hunt...

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