Check the crown. Put white out on the end of the crown to check the muzzle blast pattern. It should look like this. Nice and even. If it does not you may need to polish the end. It is super easy and cheap. All you need is a screw gun, polishing compound, and a round headed brass screw. Chuck the screw in the screwgun, smear it with polishing compound and stick the screw in the muzzle for a few seconds. If the crown is not to bad then it will polish away any imperfections. Clean it good and reshoot. I did this with a friends 93wmr and it really cleaned the groups up, helped a lot.
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Originally Posted by sha-ul
Do a search for "brass screw" "lapping compound" crown, came up with the following.
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