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Well normally just corn media shine, but now that I think about it a while back I did experiment with some half-arsed home brew wet style(unsuccessfully) to try and get the heavy deposits the...

Ahhh didn't throw them all away, found one of suspects in my ammo tin. Put in Lyman chamber gauge, dimensions look ok to me?

Suspect it maybe something to do with primer pockets, primer looks just...

Yes, understand what you are saying. I've modified Milspec triggers before and this is one of the things you do to lighten.

RockRiver 2 stage, one of their better ones in a Fred Eichler lower. Guessing around a 3lb break, quite a nice trigger that's why I don't really want to fuck with it if that's not the problem. I do...

Ok,
So no difference in case apart from thickness and pressure and you can seat bullet out further in 5,56 so case gauge essentially the same

What is a small base die? Skinnier at base for sizing? No problems feeding.
No hangfires, looked like a nice strike on primer. Yes a weaker hammer spring wouldn't help but was firing off Geco,...

Yep, have a case gauge. Just laziness and something along the lines "assumption is the mother of all fuck-ups".
When trying to mass produce ammo for semis and pistol you often cut a few corners...

Biffed the dud ammo in disgust with a big long biff, bit silly in hindsight as making assumption it was primers.
Could chamber check now and pick it up exact cause, ahh lessons learnt!

Primers were'n t proud, ok so over sizing knocking shoulder back too far creating too much headspace....had a jammed case a while back and real mission to get out, may not have set up properly and...

Yeah, but if firing pin has worked fine on numerous other brands with no problems why would it be that? In saying that you are probably not wrong but for a different reason that the case is too...

Ok thanks,
That never occurred to me, so some over-trimmed brass? Hammer striking and case having movement=not enough force to detonate.
This might actually make sense as think it was just doing it...

What primers are people using in their 223 loads for AR15?

Had heap of problems yesterday with no bang action on my reloads, using Federal small rifle primers. Factory ammo of numerous makes...