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338 Allen vs. 338 Snipe tac vs. 338 XT - Which one?

 
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  #1  
Old 07-16-2009, 04:01 PM
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338 Allen vs. 338 Snipe tac vs. 338 XT - Which one?

I am thinking about having one of the big 338 bombers built, and would like to know everyones thoughts on these calibers before I call one of the smiths.

I found balistic data for the 338 Xtreme Tactical with the 266 gr bullet they designed it for, but I can't find much balistic info on the 338 Allen Magnum or the 338 Snipe Tac. Can anyone show me their numbers?

How is the brass availability for each?

What action are your rifles built on?

What is the realistic range capability of these rifles?

What type of rangefinders are you using to accurately get out to 2000+ yards without breaking the bank?

Thanks for any info

critrgitr
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  #2  
Old 07-16-2009, 04:35 PM
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Re: 338 Allen vs. 338 Snipe tac vs. 338 XT - Which one?

I can only comment on the 338 Allen Magnum. I have a 32" barrelled 338AM that was built by Kirby Allen. I use a very mild load in my rifle and average 3270fps with the 300gr SMK. You asked about shooting to 2000yds +, I've only shot mine to 1500yds and have not had problems hitting elk vital sized targets to that distance (assuming I judge the wind correctly). I use jameson brass and can get 5-6 reloads on the brass before the shoulder is worked to the point that I can't resize it enough to feel comfortable using it in hunting. I could probably anneal the brass, but it is a high enough powered load that I feel fine throwing it out after 4-5 firings.

My rifle weighs just under 18lbs with a harris bipod attached. (Includes a 3.5x15x50 Nightforce NXS scope and 2 sets of steel nightforce rings, very large slab brake and adjustable McMillan A5 Stock. A BAT machine 1.55" action was used for my rifle.

Hope this helps. Much more info is available in the search area, in fact if I remember correctly, Kirby even posted a comparison of the different 338 boomers several months ago.

AJ
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Last edited by AJ Peacock; 07-16-2009 at 04:42 PM.
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  #3  
Old 07-16-2009, 07:43 PM
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Re: 338 Allen vs. 338 Snipe tac vs. 338 XT - Which one?

Sticky worthy post......
fastest 338 caliber?Build advice?
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  #4  
Old 07-16-2009, 09:41 PM
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Re: 338 Allen vs. 338 Snipe tac vs. 338 XT - Which one?

As far as actual performance difference, there is not alot of difference. The Sniper Tac and Xtreme are nearly identical in case design but for some reason they load the Xtreme to very low pressures. I believe this is because the brass they use will not take any higher pressure.

Because of that, it will run around 150 fps less then the Sniper Tac with same bullet and barrel length.

The 338 Allen Magnum is a bit different, shoulder angle is sharper and shoulder location is moved forward around 80 thou to increase the length of the case body.

When the 338 AM will match the Sniper Tac when loaded to the mild Xtreme pressures or will be 100 fps faster then the Sniper tac when loaded to top pressures.

In all honesty, all three are dependant on what brass they are using. Most current brass will not allow any of these to reach their full velocity potential. I generally load my 338 AM to 3300 fps in a 33" barrel length but many of my customers are pushing 3400 fps with the 300 gr SMK with good brass life.

Professionally, I would not recommend the Xtreme simply from what I have seen in the rifles. Other then that, take your pick.

One bonus of my 338 AM is that I sell fully formed, correct headstamped cases for my 338 Allen Magnum so its no different to load for then say a 300 RUM, just alot larger!!!!
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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

allenmagnum@gmail.com
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  #5  
Old 07-17-2009, 12:37 AM
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Re: 338 Allen vs. 338 Snipe tac vs. 338 XT - Which one?

I typically do not respond to something I have no personal experience with and I have none with the big 338's off the chey-tac case. But you asked for everyones thoughts so just let me do you a little comparison of things I know very well from many 338's I have built through the years. I personally stick to the biggest, baddest 338's that can be built in a 10 1/2 pound hunting rifle. If you want by far the best thing out there and do not mind an 18 pound rifle the chey-tac case is the way to go. From the velocities and accuracy reported on here from the Allen version I can tell you it would be amazing to shoot one. If I was going to do an 18 pound rifle I would not consider any other round.

This is why. The popular big 338 cases that can be built on a 10 pound hunting rifle are primarily the ultramag, the lapua and the 378 wby/416 rigby full length. The various wildcats off the ultramag case will top out from 2750-2825 with the 300 matchking. The lapua imp wildcats will top out from 2900-3000 fps. The 378/416 improved cartridges can get up to 3100 fps. Up to 300 fps difference from the ultramag stuff to the 378/416 case stuff. Or about the same as between a 30-06 and a 300 weatherby. That difference is very impressive and quite unforgettable when the bullet impacts a target. That 300 fps makes an incredible difference when shooting in the wind. To go up another 200-300 fps with the allen mag I could not imagine the thrill of shooting it. Long range hunting is different than long range shooting and my choice of calibers for each reflect that. For hunting it is caliber/weight/bc/velocity. The largest caliber, heaviest weight, highest bc bullet you can drive the fastest is going to give you the best opportunity to harvest large game. In other words the best combination of those factors and the 338 allen off the chey-tac case is going to be very hard to beat.
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  #6  
Old 07-17-2009, 12:25 PM
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Re: 338 Allen vs. 338 Snipe tac vs. 338 XT - Which one?

Thanks for all the info guys!!!!

critrgitr

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  #7  
Old 07-17-2009, 12:51 PM
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Re: 338 Allen vs. 338 Snipe tac vs. 338 XT - Which one?

LTLR brings up a valid point. There have been some claims that this class of rifle can be built into a sub 12 lb rifle using exotic carbon barrels, Ti receivers and very expensive carbon fiber barrels.

About the lightest I will build one of my rifles is 16 lbs but that is ready to hunt with including NF NXS scope, rings and harris bipod.

If your alright with a 16-19 lb rifle, the Chey Tac case is the way to go for shear performance and power at long range.

In lighter rifles there are other options that get you very good performance as those already mentioned as well as my 338 Allen Xpress which I designed specifically for this niche. For those that wanted high performance but with longer barrel life and in a lighter rifle
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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

allenmagnum@gmail.com
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