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338 build advice

The .340wby ought to be your ticket. Look for one of their AccuMark rifles with the fluted stainless light varmint barrel. Something like the Sendero SF... The AccuMarks have a good reputation as accurate shooters.

If you can wildcat, there's the .338/375 Ruger. This is about the best case design for the .338mag class. Shorter so you get more bullet seating flexibility, but maybe limited in die set availability. The .338/300win is very capable of almost duplicating the .340wby and .338rum. Very flexible for light to max loads; no detonation worries. With a Redding Type S FL die in .300win you can use a .358-.360 bushing and be in business. A Forster benchrest seater in .338win or a .300win w/.338 seater plug puts you in business with match quality dies. A Q or R drill bit (I forget which) will drill your ctg carrier out to accept the .338 plug if you go with a .300win seater.

Weatherby ammo is fairly cheap, but Norma made cases are out there.
Still looking at a 12-13lb rifle, but from a bipod or other rest the Accumark will perform right with the .338 Lapua and ultra mag. Shop for a used one and I'd bet you find one hardly broken in for about a grand... I would avoid the .338win for longrange purposes.
 
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250 gr Elite Hunter B.C. = 0.685 (85-cents each)

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300 gr Elite Hunter B.C. = 0.814 (85-cents each)

http://bergerbullets.com/products/hunting-bullets/

MIDWAY USA
https://www.midwayusa.com/s?userSearchQuery=BERGER+.338+BULLETS+&userItemsPerPage=48
 
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B.C. = .829 (The highest I have found at Midway USA).
285-gr. Hornady ELD (86-cents each)
https://www.midwayusa.com/product/684485/hornady-eld-match-bullets-polymer-tip-boat-tail

In ballistics, the ballistic coefficient (BC) of a body is a measure of its ability to overcome air resistance in flight.[1] It is inversely proportional to the negative acceleration: a high number indicates a low negative acceleration—the drag on the vehicle or projectile is small in proportion to its mass.
https://en.wikipedia.org/wiki/Ballistic_coefficient
 
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