Info on RCBS Ammo Master eloading press

[Sagebrush7]

Need a heavy duty press to size large size cast lead 50 caliber and larger bullets with BMG size .025 gas checks Have you used one and recommend for other calibers? James

[DonMountain]

I size .458 caliber 520 grain bullets for a 45-70 without much trouble with an RCBS LAM-II sizer/lubricator including installing gas checks. I don't believe it will take much additional effort to size .510" diameter bullets. I use an RCBS Ammo Master for doing all of my really heavy work like reforming cases and resizing/loading 50 BMG rounds. I believe this press has way more capacity than what you require for resizing 50 caliber rounds. I would recommend just trying a 0.512" RCBS sizer die in your LAM-II.