Re: 338 edge
i was discussing this a couple weeks ago with someone that has a lot of experience with big cartridges. i had 2 shells not go off last year. the primer ignited, but only burnt/blackened the bottom 1/3 of the powder column. this was with the edge and 215 primers. he said it's important to get as close as possible to a 100% load density for this reason. if there's too much room in there to move the powder, not enough of it will get ignited and won't go off, inconsistant ignition, cause higher than normal spreads, of course accuracy will suffer. it's why you use magnum primers in the big stuff.