If you can get your hands on some 55 gr bullets , give a 21.5 gr shot of Reloader 7 and that 55 gr bullet a try and see how it shoots for you... that is Sierra's recommended accuracy load for the 55 gr projectiles ... Both my 1 in 12 ruger target grey and my 1 in 9 20" Colt AR like this loading alot , The AR witha 55 gr FMJBT and the Target grey the 55 gr hornady V-max..
If you can get into some of the winchester 64 gr that would be a good round for the 1 in 9 twist rate your rifles barrel has ... Like wise the 68 , 69 , 70 and very possibly the 75gr projectiles would be worth tryin in the future..
John is right also , the 60 gr should be a good choice to go with if you can find them , 62's are always a awesome performer but like the 60s good luck finding them ..
Hope this helps you out ,
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