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338 lapua v. 338-378 weatherby

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Unread 12-10-2004, 05:11 PM
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Re: 338 lapua v. 338-378 weatherby

Christopher, I have a 338 Lapua and love it. I don't see how the 338-378 gets 150-200fps more than the Lapua?
The Wby gives you 3060 with a 250 grain, you could get that from the Lapua. Besides velocity is not the be-alll end-all. Its accuracy that counts!

I wouldn't buy the HS precision rifle for that much.
I paid $3000 for my full custom 338 lapua that my smith built the way I wanted it.

PGW M18 SS Action
McMillian Rem hunter stock
Jewell Trigger
Lilja #7 fluted 28" tube
Tally bases and rings.

I have no complaints!
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Unread 12-10-2004, 10:58 PM
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Join Date: Jun 2004
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Re: 338 lapua v. 338-378 weatherby

John M,

I agree with most of your comments about accuracy being the end all as far a long range performance goes but I will also say that in 26" or longer barrels when they are both loaded with the 300 gr ULD bullets, the 338-378 Wby will easily top the Lapua by 150 fps.

I have yet to see the 338 Lapua top 2900 fps with a 250 gr bullet in a 26" barrel without it being overloaded. Your 28" barrel will obviously produce more fps. The 338-378 Wby in an Accumark will hit 3075 fps with the 250s comfortably with the proper loading, in fact I have witnessed 3100 fps from the 338-378 Wby with decent case life. It was a hotter load then I would recommend but he was getting 5 firings per case so whatever I guess.

In 30" or longer barrels, the velocity advantage with these 300 gr ULD will be 200 fps.

With the lighter 250 gr class of bullets the Lapua does do pretty well in velocity but it is still a ways short of the 338-378.

As an example, my 338 Kahn will drive the 250 gr bullets to just shy of 3400 fps out of its 34.5" barrel. Figuring I would loose about 20 fps per inch of barrel which is probably more then I really would, that would be around 130 fps from just barrel length compared to your 28" barrel which would result in a velocity of +3250 fps or right at that 200 fps advantage. The Kahn is slightly larger in case capacity then the standard 338-378 but they are similiar.

Again though, you are correct that the rifle needs to be built to deliever teh accuracy needed for extreme range use or everything is wasted.

Good Shooting!!!

Kirby Allen
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 12-14-2004, 11:59 PM
Bronze Member
Join Date: Dec 2004
Location: BC
Posts: 89
Re: 338 lapua v. 338-378 weatherby

What type of accuracy can I expect from a Weatherby Accumark
338/378? I looked at one locally here in Vancouver, BC on special for roughly $1500 in American $ after converting, and thought econonically it's a good deal.

I currently use a Sako 338 Win Mag my favorite load is a 250 gr Sierra with 69.5 gr of IMR 4350 which I chronographed @ 2780 fps @ 65 degrees F. When I'm able to concentrate the rifle will shoot MOA or better. I like it, but would also like to reach out a little farther. BC is a land on edge and shooting across valleys up to 5 or 6 hundred yards is often the only reasonable choice. I've taken an Elk and a Moose this way and never lost game.

Ok so let me phrase my question this way: Do you think the Weatherby Accumark will equal or exceed the ACCURACY of what I stated for my Sako? I appreaciate your comments.
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Unread 12-15-2004, 03:17 AM
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Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: 338 lapua v. 338-378 weatherby

Kirby might know more on the 338/378 WBY, but my brother's pushes the 300 gr. SMK at 3050 fps in the 32" Pac-Nor with 118gr H870 at 4.1" OAL.

He's loaded them up to 122gr at 3150 but brass didn't last real long...
Brent Moffitt
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Unread 12-15-2004, 09:01 AM
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Join Date: Feb 2002
Location: Jackson MI
Posts: 247
Re: 338 lapua v. 338-378 weatherby

A friend has a 338-378 Wby and I watched him shoot just under 1" at 100 yards with factory 250gr loads.
"When working with the public, there are two things you need to remember. - 1. The public is a bunch of ignorant morons. - 2. YOU and I are one of them!"
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Unread 12-15-2004, 09:34 PM
Bronze Member
Join Date: Dec 2004
Location: BC
Posts: 89
Re: 338 lapua v. 338-378 weatherby

Hm, that's good to hear, but it's already too late for me. I bought the rifle today, but here in Canada since I've only got a possesion of firearms permit, I have to leave the rifle at the store until I pass the acquisition test and receive the permit which will likely take several months. Fortunately in the meantime I still have my 222, 270, 308, 7mmRemMag, and 338 Win Mag.
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Unread 12-15-2004, 09:49 PM
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Join Date: Dec 2004
Location: BC
Posts: 89
Re: 338 lapua v. 338-378 weatherby

Interesting...I've been away from shooting for about 10 years and am getting back into it. From what I hear here, it sounds like a lot more people have realized what a good caliber the big 338's are. I don't know what a "Pac-Nor" is, but will probably eventually replace the stock 26" barrel with a 30" Lilja one or two contours heavier than the stock barrel. I don't know what a "SMK" is either, although I've heard Sierra has a 300gr Matchking with a verry high BC. What worries me about that bullet is that it might blow up on an Elk or Moose.

Years ago I picked up 8 lbs of H870 figuring someday I'd get a 338/378. Also I've a hundred of the old style Barnes 300 gr round nose for up close against a Grizzly. Which I wouldn't want to load any faster than 2700fps for that purpose. Although, if I was hunting Grizzly specifically I want to use something more like a 475/416...ah another rifle to dream about...
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