I seem to only have issues with .223/5.56 brass on my RCBS Trimmer. My pilot is .220" for the obvious .223 caliber I mean .224" bullet but man I swear this is not supposed to be so damned hard. My .30 cal is nowhere near as hard nor has the 6mm pilot been difficult. I really have to force that pilot in the case neck. We are talking I have to push so hard my freaking shoulders start hurting after a dozen cases. I've tried the drill method but that doesn't help with pilot insert or lateral pushing force. I'm using RCBS dies (11103). So I'm about to revert to trimming before sizing with this caliber. I'll trim to the short end of the size and brass shouldn't grow that much after one sizing. Reasons against? Let's hear it. Edit: I've been slowly trying to sand down the pilot and so far I've been hesitant to go a long way on sanding. Maybe I should just keep going until it fits properly..?