I was at the range yesterday and all of my reloaded LC brass failed to chamber in my Howa. This is a new gun but it happens in my other Howa also. It just happens with LC brass so I'm perplexed. It isn't one year stamp like 07 or 03, it's all LC brass. I don't know where the brass came from other than it's brass I have picked up or was given to me. The COL on all my ammo in the same. I'm using 55 grain Hornady FMJBT bullets if that matters.
My understanding is 5.56 and .223 have the exact same case dimensions. My Hornady manual confirmed that.
My theory is because it's LC (5.56) it was fired in an AR. I don't know why an AR chamber would be different but I know very little about them as I don't own one. It appears the shoulder of the brass has been rounded and isn't as defined as my .223 brass. It could also be the base of the case being too large but I have my doubts about that.
I full length resize so I'm not understanding why my LC brass won't chamber.
Anyone have any insight or helpful suggestions?
