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338 lapua v. 338-378 weatherby

 
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  #15  
Old 12-16-2004, 04:10 PM
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Re: 338 lapua v. 338-378 weatherby

I assure you the 300 gr Sierra Matchking(SMK) will not explode on elk and moose size targets. They actually perform quite well on this size targets from all the reports I have seen and heard about.

I personally have found H-50BMG to be the best powder I have tested in my 338 Kahn. I do not load it very hot, in fact pretty mildly at around 3050 fps but it shoots very well.

I have some H-870 but not enough to really develop a load for this round. Sure as heck as soon as I played with this powder I would find that magical load about the time I ran out of powder.

Out of my V-Block rifles, the 338 Kahn will average less then 1.5" groups at 500 yards for three shot groups. I have shot several groups in the.8" to .9" range with the 300 gr Wildcat Bullets ULDs at this range.

A properly set up 338-378 will do the same thing of the ammo is up to it.

Good Shooting!!!

Kirby Allen(50)
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  #16  
Old 12-16-2004, 05:21 PM
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Re: 338 lapua v. 338-378 weatherby

guys, thanks for the overwhelming amount of feed back. I believe that I have decided to get sort of a two in one deal. After some of the comments about H S Precision, I have decided to go with a fast little 257 wby round in this rifle and my new question is what type of barrel I should use to rechamber my 300 wby into a 338 caliber. Does anybody know if I can use the same action as in the mark v action chambered in 300 wby to make a 338 ultra mag or should I stick with the 340 wby. I have a buddy gunsmith who can do this and put a brake on it for a reasonable price.
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  #17  
Old 12-16-2004, 11:56 PM
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Re: 338 lapua v. 338-378 weatherby

Hm, ok I'd heard of the 300 gr Sierra at Lilja's site, but dismissed them thinking they were hollow points and would explode at close range, under 500 yards. Looking at his data now which says I could get 3100 fps with the 250 gr and 2900 + with the 300 gr, makes me think I'll have to try the 300 gr too. They wern't in existence the last time I did load developement for my 338 Win Mag.

If your rifles can produce that kind of accuracy they're certainly worth that money. With a little luck maybe someday I'll have one of your rifles. Is the Kahn made only in single shots? I wonder because the recoil of these rifles might unseat the bullets in the magazine and looking at the 378 case the only way I can see to improve it would be to shorten the case neck. It would be interesting to hear how you improved the 378 case. For now my interest is for a long range hunting rifle.

I can see my spare time and money will be tied up likely for the next couple of years getting my Accumark up to speed and fully equiped. Do you have any advice as to what primers, powder and brass to use with either the 250 or 300 grainers? I intend to start with Federal primers and get some Weaterhby/Norma brass and try my existing supply of H-870.
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  #18  
Old 12-17-2004, 09:28 AM
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Re: 338 lapua v. 338-378 weatherby

In your 338 Win, you will probably only get around 2500 fps with the 300 gr Smk. This is fine for long range shooting but long range hunting teh larger rounds are generally used. This is not to say that it will not perform because it will.



This pic shows the 338-378 Wby parent cases on the left and the 338 Kahn cases on the rifle. The shoulder is moved slightly forward and the shoulder is blown out to a 35 degree conventional shoulder. Case capacity is increased by around 8 grains.



This pic shows a 338 RUM flanked by two 338 Kahns.

Good Shooting!!

Kirby Allen(50)
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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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  #19  
Old 12-18-2004, 03:05 PM
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Re: 338 lapua v. 338-378 weatherby

Ah ok, a picture is worth a thousand words. I notice you neck turn your cases. Do you use a Forester neck turner? Last time I was shooting I bought bought a Forester neck turning machine, but quit shooting before I used it.

Are your rifles single shots? I understand that the single shot is prefered for target shooting becasue the action is stiffer and more solid.

I see the case necks were shortened by pushing forward the case shoulder on your Kahn. Originally I thought about having a gun made based on the 338 A-Square Excalibur, but those cases are extremely exspensive about 3x the cost of Weatherby 338/378 cases. Is this the main reason no one uses the 338 Excalibur? Your Kahn seems to approximate it's case capacity. By the way I was mildly shocked at the cost of 338/378 brass here in Canada $62/box of 20, the cheapest I've been able to find here. I tried Midlway in the states, but despite NFTA they don't ship to Canada. [img]/ubbthreads/images/graemlins/frown.gif[/img] Their cost would have been about $40/box of 20 in Canadian$. The a mail order house didn't have 300gr. SMKs in stock so I back ordered 200 with the 120 brass.

Can you recommend Scope Bases and Rings for a Weatherby 338/378? Since my main use for the rifle will be hunting Elk and Moose in Grizzly country I'm looking for a variable scope in the range of 2x7 to 3x10 in Luepold, Swavorski, or Zeiss. Of course I'm interested to hear any recommendations you have with regard to scope as well. Thank you for your time I think this thread of conversation will be of interest to others in the future.
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  #20  
Old 12-18-2004, 06:16 PM
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Re: 338 lapua v. 338-378 weatherby

I already have a Lapua and just ordered a 338-378. I don't think the difference is that great, but I'll let you know real world numbers when the new rifle comes in.

Jim
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  #21  
Old 12-19-2004, 12:39 PM
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Re: 338 lapua v. 338-378 weatherby

The Excaliber is a great design but I think the legal trouble A-Square had kind of scared off alot of people from using their stuff that could not be formed from other brass. Also cost is also an issue.

My Heavy V-Block rifles are all single shot. I am not concerned with stiffness really as this is not an issue with a Barrel Bedding V-Block rifle where the action is totally floated and converted to a non stressed componant of the rifle except of course the first 1.5" that has to hold the bolt in place.

Mounting a scope on a heavy recoiling rifle, especially one with high recoil velocitied can be hard on a mounting system.

For a lower price set up that is still brute strong, I find a Burris Double Dovetail system using the Burris Signature rings is very hard to beat for strength and scope holding power. Plus they are very easy on the scope body.

YOu do give up some versitility with the double dove tail which does not make it the best for extreme range shooting but for a big game rifle used out to 500 to 600 yards they are a very good system.

Other then that, any of the heavy tactical rings from Leupold, Badger and many others work well.

My 338 Kahn has a Standard Burris one piece base with Sig rings but my 338 Kahn also weights 26 lbs. In a more conventional weight rifle, the standard base is subject to slipping the rear scope ring. Something to consider. I have only seen this once with Burris Sig rings and that was due to a broken clamping bolt but with other rings this is a common problem.

Always remember it is easier to keep a light weight scope solidly in place then a heavy scope. Physicals is a bugger in this aspect.

GOod Shooting!!

Kirby Allen(50)
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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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