So I just got a new chaser to mess around with at my field and first it was chopping. A lot. I'm assuming it's due to brittle paint and with new paint and adjusting the velocity that problem will be solved but when I was trying to take out the bolt to clean it, the screw in the back would NOT turn clockwise and I ended up stripping it.

Any ideas on how I'm supposed to get the bolt out now?
Also the second 12 gram I inserted ended up shooting C02 everywhere and emptied it all out, not sure if it's a problem yet as that was my last cartridge and haven't tried it again.
Any help is appreciated, thanks and merry christmas!