I am having problems with remington copper solids going off in my gun and I am having a hard time finding the federal barnes expanders. Please let me know your results with the 20 ga USH and the Hornady SST's. I know they are a little faster than the copper solids and they may be a little fast for the rifling in the USH barrells. I am looking for a recommendation and what kind of accuracy others are getting with the SST's.