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  #8  
Old 11-08-2004, 08:01 PM
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Join Date: Aug 2004
Location: utah
Posts: 302
Re: .338

CrowMag,
I have read your post's on your 338 Lapua Mag Imp Nawaska (sorry I know I mis-spelled it) but are you kidding me a 338/408 Chey-Tac please tell me more about it, I am fascinated.
Thanks B
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  #9  
Old 11-08-2004, 09:44 PM
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Join Date: Mar 2002
Location: mi
Posts: 991
Re: .338

I have been thinking about having a barrel chambered for the 338/408 for my HG if the 350g bullets work in the 338 Nawakwa I will be getting a 40" barrel and new bolt for my 10" Bat and have Bruce Bear chamber it for the 338/408 and see what it will do here is a pic
Crow Mag
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  #10  
Old 11-08-2004, 09:51 PM
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Join Date: Dec 2003
Location: Springfield, VA
Posts: 40
Re: .338

Whats the difference in case capacity between the 338 YOGI, and the 338/416 Rigby improved?
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  #11  
Old 11-09-2004, 10:10 AM
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Join Date: Aug 2004
Location: utah
Posts: 302
Re: .338

CrowMag,
thanks for the pic.let us know how it works out it sounds very interesting.
what could possibly be left after that cartridge a 408/50bmg Imp ?????
B
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  #12  
Old 11-09-2004, 10:26 AM
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Join Date: Sep 2004
Location: Nevada
Posts: 594
Re: .338

Crow Mag - You've got me rethinking my idea of a 32 inch Lilja target SS 1.250 6 inches then taper to .875 or so using Lapua 338. My thoughts also included a 2 inch brake bringing the barrel length to 34 inches.

Correct me if I'm wrong. We did some extensive testing in .277, .284, & .30 using the heavier bullets in each class. Comparing identicle loads using slightly hotter powders like 4831,r-22, 7828, MRP in 24 inch barrels vs. 28 inch.

Then and slower powders like 7828, h1000, r-25 h-870 in 26 inch vs 30. We were looking at chrono readings and the gains of FPS with optimized powders for barrel length. Of course it proved that a longer barrels can take advantage of slower powders and have increased FPS.

What I did find is that the speed between 28 and 30 inch followed the law of diminishing returns. That's why i kind of limited my barrel idea to 32 inches.

Your planing on 40 inches. Am I wrong in thinking that the speed increase is minimal over a 34 including a 2 inch brake? [img]images/icons/confused.gif[/img]

[ 11-09-2004: Message edited by: budlight ]
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.270 Ackley improved 29 inch 1.250 dia. target barrel 7mm STW 28 inch 1.250 target barrel. I also love my .458 mag for varmints and the biggest game in the world.
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  #13  
Old 11-09-2004, 04:33 PM
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Join Date: Mar 2002
Location: mi
Posts: 991
Re: .338

We want the most velocity we can get and still be very accurate. I am talking about a bench rifle around 70 to 90 pounds with at least a 1.450 to 2" barrel no taper in a barrel block. Not something you would want to carry far. I am hoping to get the 350g ULD bullets to a velocity around 3200 fps with a bc of around .920 shot at an elevation of 10,000" above sea level this would shoot very flat at ultra long range and have a substantial amount of energy. I have a 338 Lapua IMP that is in a LG #17 with a 1.250 HV taper 10T 29 1/2" barrel + brake this rifle works excellent for a rifle that is easy to carry and shoot off a bipod.
Dan Lilja did a test on the 338/378 here is a link. http://www.riflebarrels.com/articles...l_velocity.htm

Crow Mag

[ 11-09-2004: Message edited by: crow mag ]
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  #14  
Old 11-09-2004, 04:57 PM
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Join Date: Sep 2004
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Posts: 594
Re: .338

[img]images/icons/smile.gif[/img] Very interesting read. My two target/hunting guns are sub 20 pounders and I've learned how to keep changing arms while humping the mountians. I'm hoping to manage a 34 inch.

40 - 42 inch does get that little extra FPS

I've hunted at 9000 feet near tree line. This summer i saw elk bedded down in meadows at 12,000 feet. But they would be way off the mountian during hunting season.
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.270 Ackley improved 29 inch 1.250 dia. target barrel 7mm STW 28 inch 1.250 target barrel. I also love my .458 mag for varmints and the biggest game in the world.
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