I have not tried any thing over the 60 grain V-MAX. I use mine for shooting critters and such, and do not want to shoot any thing that may croom off into the wild blue. I do most of my shooting where there are houses not too far away. With that said, I still think the 60 grainers will shoot well, as well as the heavier VLD bullets up to around 70 - 74 grains. I just need to find a good powder and powder charge to go with it. I have Benchmark, Varget and H4895 to try with them, but have not had the time yet. I really think I will hit gold with one of them. I was using VV N133 which shoots a 50 grain V-MAX very, very well, but that is in a 1-14" twist barrel. I have several bullets in the 55 grain weight too. I would think I could find a good load with one of them also. I should mention that the 223 barrel that is 1-9" twist is a light weight 22" barrel. I have found that I can still find a load that shoots well in them as long as I space out the shots. I am going on here a little, but I have found in general that the heavier the bullet, the slower the powder needs to be to shoot well. That is why I have the powders listed to try. They are in the slower end of the 223 range. Keep us posted on your findings.