Not sure, it would be a gamble to cut the barrel and re-crown, chocke, etc. No guarantees I would think.
None of my Springers shoot the Predators well. The 350 .22 does ok with them, but the domed ones shoot a little more accurately so I use those. They jam in my 850 .22 and in .177 they were just average with not the optimal groups I was looking for. Even my .22 PCP doesn't shoot great with the Preds. I wish my guns liked the Preds so I had more pellet choice, and use all the tins of Preds I have but they don't. Any pellet that your gun likes will be deadly to small game. You should not have to chop up your gun and throw $ at it. There should be domed pellets out there shooting accurately in your gun. If none of them don't, then your gun needs a good tune with a fresh seal, and other parts, and if that doesn't work, I 'd have the barrel checked or replaced.