Although you didn't mention what ammunition was used if you do not reload then you are at the mercy of the ammo companies. Having said all that My #4MK2 was given a thorough cleaning and only the remington 180 grain softpoint shot the best. I have tried Sellier and Bellot fmj's, greek HXP fmj's and South African FMJ's. Of the three the Greek HXP was the best followed by the South African and lastly the Sellier and Bellot. Unfortunatly the South African is no longer available. Still mentally kicking myself for not picking up a case when it was still available. The South African was berdan primed but the Greek and Sellier and Bellot are boxer primed. Frank