Not Sure What To Do…Continued POI Shift

I recently posted a topic related to barrel fouling and after a good cleaning, things tightened up….Thought my troubles were solved…..but things started going south after a couple of targets. So, I switched scopes and sure ’nuff things tightened up for a couple of targets then POI started shifting and groups started spreading. So I tried changing lubricants on the pellets from Finish Line Krytech to FP-10…and you guessed it things improved only to fall apart.

I picked up a Mad Dog Ultima Long stock…which of course helped quite a bit. BTW, KnifeMaker has a very good idea to shim gap between bottle and stock to negate bottle flex. I used a rubber wine cork, cut lenght-wise and sanded til it fits snug…that also helped but then groups widened up.

I thought about changing shooters to get rid of the “me” variable…but right now none are around this area that I know, so, I got out the trusty Marauder .25. It shot very tight and consistent.
I did read on the Yellow where there is speculation about POI shift being related to the AF barrel bushings. Adam SoCal makes an interesting, low cost suggestion to shellac the barrel bushings with fingernail polish, let dry then press them in to over come the gap issue. I’ll try that. Doug (Dyotat100) makes larger bushings that improve accuracy he has helped Tofazfou and his .257 setup….that’s a thought.

The next move is to tear the gun completely apart and clean it thoroughly. I’ll coat the main tube/hammer/spring with Finish Line Teflon. Then I’ll reassemble and use Blue Loctite on all screws. Not sure if I’ll fingernail polish at this time but why not? Also I have one more scope/rings combo to try…. a Leapers tactical side focus scope.

I’ll roll the barrel on plate glass to check that it’s true…while it’s out of the gun.

After that….I’m out of ideas. I really like this gun but if it continues to shoot this bad, I might have to cut my losses and go for something else.

I hate being beaten so if anyone has ANY suggestions please let me know. I’m including yesterday’s target, (30 yards starting at top left at 3000 psi shooting off a bench with bag). It might speak for itself. Looks like things tightened up towards the last few groups but there still was a little shift also the last group was shot 54-60 so pressure was getting low.

Thanks for any suggestions and help.

Five shot groups starting top left, JSB EK’s/FP-10.