Re: Need info on fireforming 338 Lapua Imp
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If its a true 338 Lapua Improved chamber set up properly, its totally safe to shoot stadnard 338 Lapua ammo through it to form cases.
Is the extra 100 to 150 fps worth it, thats your call. Basically puts you in the same class as the 338-378 with around 10 grains less powder capacity.
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Thanks for the info Kirby. It is great to have knowledgeable people like you to provide information and guide us.