It almost sounds like you need a tighter ball/patch combination. I've read about this on here many times, but have never experienced it.
Some use a "fouling shot" to cure this...others use a bit of veggie oil to coat the inside of the barrel before the first shot. I myself have a very tight ball/patch combo and my first shot is just as accurate as my last.I do however use some brake clean to swab out my barrel and then I pop a couple of caps off. Then load as usual.
Just my 2 cents...
Some use a "fouling shot" to cure this...others use a bit of veggie oil to coat the inside of the barrel before the first shot. I myself have a very tight ball/patch combo and my first shot is just as accurate as my last.I do however use some brake clean to swab out my barrel and then I pop a couple of caps off. Then load as usual.
Just my 2 cents...