I purchased approximately 120 loaded 500 Jeffrey cartridges from a member here. I dug some out to let a few friends experience the rifle and recoil. With some pre shot coaching they handled it well! However before the first round was fired I noticed high primers. Sorting through the cartridges many were in the same condition. Referring back to the ad some of them were from an estate sale. I do not hold the seller responsible, he did represent as such. The boxes were from reputable companies but obviously not factory. One would think with such a cartridge, an experienced person would be loading them. Taking no chances I pulled and deprimed 86. Weighing the bullets and charges (unknown powder type) they seemed to match up to manuals, and 9 had cracked case necks. I did fully seat a primer and I did go off, but I tossed them in a bottle of water. All brass was Jamison and were virgin. The dates on the custom boxes was from 2010. There were 12 that has some sort of filler above the powder. I made up a few dummies for friends, still have the components to reload, but I'll anneal before I do anything with these Jamison cases. When something isn't right, or don't seem right step back for a moment. It's not worth injury or destroying a rifle. John