For most of my springers, this would be OK, but . . .
This was with my Slavia CZ-634, .177 w/ Bushnell Trophy 4-12X 44mm AO at 30 yards
Beeman FTS pellets
With most springers, this would be OK, but, something seems to be wrong with one of my very best springers. It was getting flyers (some off the paper) with JSB Exacts! What the heck! Switched to FTS which have a bit tighter fit, re-zeroed, and had some improvement, but still, I had 3 or 4 "zero" scores, all high and right and it wasn't grouping well. Checked the scope and action screws --OK. So . . .
I took the CZ-634 back inside and pushed a dozen small round patches saturated with GooGone through the barrel from the breech end with a .17 Dewey rod and jag. I got an amazing amount of what looked not like lead fouling, but "tar-like crud" out of the barrel. Then I pushed another 8 or 10 dry cotton patches until these were coming out almost clean. Then I took some J&B bore polish on a single patch and pushed it trough several times. The another 8 or 10 dry cotton patches until they came out clean. Then one more GooGone and a three or 4 more dry patches. The barrel now seemed squeaky clean. I shot three 20-shot matches (the score is from the second of three) immediately after cleaning with much improvement, but still an occasional flyer. It may need some time to re-cure the barrel with a bit of fresh lead. It may all be in my head, but I think the rifle is shooting just a bit harsher with an occasional different spring twang from time to time. I am wondering if it is getting "dry" and needs some more lube or if, perhaps, I may have a broken spring.