Curtis I noticed the same thing, my theory is when using powders like 4756 that are on the slow side the plated bullets just don't allow the powder to build enough pressure to get the burn right. I have gone over max loads just to get them where they were healthy but right where they start to working good they go full retard with just a hair more powder. I like plated bullets because they are cheap but ive had better luck with heavy bullets like 230 ball or 180gr in 45acp and .40. 115 plateds are great but its just hard to get them dialed in being that light. I just bought a lb of longshot and I'm gonna try and get something that works to finish off all these plated but then I'm getting either 147 bayou bullets or some real jacketed 115 bullets and load them to 1300 plus