RE: Thompson Center Thunderhawk
Try upgrading to a flame thrower nipple and if you can locate some RWS 1075+ plus caps with loose powder you wil never have any problems.I own a 54 cal. thunderhawk with A walnut stock ,been in rain,sleet,snow the gun always fired.I tried 777 powder but the gun favors pyrodex selct or real BP goex3f.