What is TIR? Also, is it required that you use "small base" dies for AR reloads?
Total Indicator Runout.
No.
Anything to the right of the 100ths place in overall length is irrelevant.
Yes sir. Total indicatior reading, but for run-out. I like straight ammo. It tends to shoot better than crooked chidt. Im running small base dies for my CLE chambers. Get good accuracy and good enough longevity out of my brass. Not that im too concerned about it. Brass is free around here.
If adding crimp reduces your indicated runout, you probably have something funky going on elsewhere in the loading process. Obviously we all like straight ammo for accuracy, but crimping isn't usually necessary or helpful.
You are a fu cking idiot. That is an old trick to reduce run-out. It's also the way I set all of my dies and I get far better accuracy than most do here. How do you fare at shooting and accuracy? Until you can start proving you know what you are talking about, I'd suggest you shut the fu ck up.
Calm down Francis. That sure seems like a lot of anger to put into something so minor as crimping; maybe it's really about your need to prove that you're the best person here all the time?
If you can set that aside for a minute, could you explain how/why adding crimp straightens out a crooked round? Show us your runout numbers and explain what the mechanism is that straightens out the rounds when you crimp.
I could picture maybe if you've got a sticky expander ball pulling necks out of alignment, that adding a crimp might push the neck back down into place. Not sure what other mechanism could be responsible for the straightening.
Never experienced that phenomenon myself, but maybe that's because I can't shoot, like most everyone else here.
