Cool, here is my shot string with a Gen 1 Mrod .25, Bstaley O-ring mod, and the old clear tubing depinger trick, using JSB Kings25.4 gr. 824, 830, 829, 830, 840, 832, 833, 834, 833, 830, 829, 826, 825, 809, 798, 788 (16 shots) 782, 778, 771, 762. I started at 3000 psi and think I finished around 2000 or so. My gauge on the gun was going out so Im not sure about the final pressure. Is there much room for improved efficiency? More shots at the same average velocity would be nice. The guns shoots better than I can so accuracy is just fine with me. I have done very minimal tuning.
I was told about this thread from someone on another forum, so I just joined to ask(at least I'm honest). I know you said you haven't messed with a lot of stock guns, but I'll appreciate any advice you have. The gun shoots "two groups" for lack of a better description. It will put three in the same hole, and then three more in another group about an inch low/left. I does the same think with every different pellet I have tried, which is about 5 different ones. I have checked all the baffles/o-rings, and even "un-floated" the barrel shroud with o-rings on the shroud/brace. The barrel is centered on the gun and in the shroud without me moving anything, even after "un-floating" the shroud. I fear I may have lost the barrel lottery for the .22, but would rather pay for another barrel from crossman, than deal with returning the gun etc. If it were slinging the pellets all over, I would definitely think barrel, but the fact that it is shooting two distinct groups is just odd to me. I appreciate your time! Oh, and I forgot to mention I am shooting at 20-25yds...