Bertram Brass 375 Remington Ultra Mag Unprimed Box of 20

I ordered 100 of the 375 rum brass and I am pleasantly surprised. I weighed some and the spread was only 3 grains. Lapua 338 lapua brass has that much and these cases are actually bigger and hold more powder. In hardness they are similar to Winchester brass. I will definitely buy again. I was skeptical at first but I am a believer now!! As for the primer pockets? Perfect. I loader wlrm primers with a rcbs priming tool that screws to the bench with the cammed primer tube and about a foot long lever handle. The primers were snug but went to bottom without crushing. Just the way you want. I am loading R25 and approaching maximum with a 300 grain bullet and no ejector marks and only .0005 expansion. What is not to like? Also this is the only component brass available for this boomer