Anyone out there with a hunterbolt may want to try the following. Remove bolt, lay a 2 inch piece of tape in the breech opening with the ends sticking out to either side of the gun. Replace bolt and pull tape tight around the end of the bolt & breech plug after priming. Makes a nice tight seal. I went the whole ml % regular season and didn't catch this year but the gun fired at the end of it all with no problems. The weather over the course of my 16 day hunt was terrible. Only 1 & 1/2 days of sun, 14 & 1/2 of rain! If you can figure out what I mean, It really works. Good luck.