12.7 X 48 (510 whisper) Ammo Box

I've been using cases for .338 Lapua Mag and they work great. I like the MTM case gard cases the best. Berrys manufacturing makes some too but I've found them to be a bit more brittle. The ones from MTM have a base inside which holds the bullet end and keeps things from rattling around as much. You can load ammo in the cases bullet up or down as well. The berrys boxes are just square holes so the ammo bounces around a bit more. Either one works. I'm using the 50rd cases and both companies make them for 20rd as well. The MTM case number is H50 XL if memory serves. I don't know the Berrys number but I can go down to the shop this eve and look at a case if you need the number. I use both BMG bullets and short Barnes 300gr flat points and the cases work great for all.

Hope that helps

Frank