I had a similar idea, wanted to build a full length H&H MAgnum 338 and so simply necked up the 8mm RemMag case to 338 for my 340 Tyrannosaur. I get 3100fps from 225gr Barnes TTSX bullets (Exact same speed the 338 Lapua round gets with those according to the Barnes Manual), and can use 340WBY or 338 Winchester Magnum ammo in my rifle if I need to or want to. Case making is a snap, just run an 8mm RemMag case through a 340WBY or 338 Win Mag re sizing die, but only enough of it to push the neck out to take the new .338 bullets.
I have been shooting this round for about 20 years now, and really like it on larger game.
LOVE God, LOVE your family, LOVE your country, LIKE guns and sports.
About 2016 team "R" candidates "We definitely need a crew with a sack of balls the size of hot water bottles, bloviated estrogen leaking feel-gooders need not apply." Gunner 500
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