i have the same rifle as you ,iv had the same problem..becouse its such a fast round it needs cleaning really well after use, boreshine which i have is not really the best around ,find another ...give it a good soak .in your copper cleaner ..in fact clean it twice and then some.. i was useing remmington ammo and found it bang on ..32gn but now homeload ..check the crown on your barrel for any dents i had a really small one on mine and it made the bullets drift a bit ..i would get two on then one top left ...8x56 scope is really no good for you to try to shoot a 1" group at 100 yrds ..you ne