I have a ZKK601 .308 that I have always used PPU 165gr rounds in as they were the 1st ones I tried when I bought the rifle and they group great. Whilst at the H4H shoot, I ran out so had to buy some at Bisley, but they only had some GGG 168gr which I bought and used (very well I might add get 40/50 on the running deer!!)
What I noticed was how much easier the bolt closed using the GGG ammo as opposed to the PPU.
What causes the tightness when closing the bolt with certain factory ammo?
Is it safe to use ammo where the bolt is tight to close?
Will it affect acuracy? This may (hopefully) be the reason I shot like a muppet on the stalkers test!!
Is there anything I can do to check for problems, ie, colouring in a round with black pen and looking for marks, etc? I have a couple PPU left in the ammo safe at home so don't need to buy a full box to try.
I know the chamber is nice and clean but I've never had the bolt to bits to clean so maybe this could be an issue? If so anyone know how to dismantle a ZKK601 bolt for cleaning?