mike is doing what your all doing, except, the milllion other things we take for granted.. well need to start with powder amount, under ball wad if any, patch or paper or whatever , lube type and amount, ramming PRESSURE, and then your wipping tecknique (wipe liquid type, amount, wiping patch type, fit, size of jag etc etc.. .. comeon guys, you didnt just slide powder and a mini down and shoot 1/2 inch groups.. remember the problems with your first black powder gun?? also mike you need to look for loose sights, bad caps, try some different powder?.. id try 2fg as snowshoe did and if hes having good luck with that gun contact him oflist to get you going with round ball, if that is what you want to use.., for that type of thin rifling a tight ball and patch with some kind of lube, doesnt matter a whole lot try severa lubes withl 3-5 shot groups each.. do not deformr the ball, try to get it down very firm without deformiing it.. in cold or dry weather i use lots of lube.. in cold weather after your first shot take 1/2 murphy soap oil and 1/2 denatured alcohol and put it on a medium tight patch doesnt have to be real tight and run it down the bore with enough liquid to get it soft all the way down.. this takes a little liquid that is just right, too much and youl start messng with your ignition, too little and you wont soften the powder..work the breach area well so you soften the crud ring that crushes the ball undersize and ruins accuracy.. then one dry patch up and down then reload the way you did the first one.. make sure you get the muzzel well with each.. what is most likely happening is yur either stripping the ball and patch,,, or blowing holes in the patch, cuting the patch with sharp rifling,, or the breach crud ring is crushing ball down to under size, once the ball is loaded down by the crud riing and moves forward past it, it starts blow by around the ball and ruins accuracy.. dave , helena monana....