I was at the range the other day with a friend, helping him sight in an older 30-30 Model94. He was using brand new Remington CorLok cartridges. On 50% of the 20 rounds he fired half had neck splitting.
The splitting did not start at the lip of the cartridge but slightly down from the lip and extending about to the shoulder. I suggested an oversized chamber might be the cause. Was I right or did I miss other possibility?
thanks
atr