I have a pistol I made 50cal. 16" barrel 1-48" twist, I call it my Tenn Pistol. Will shoot 3 shots into one hole at 25yds with 40 grns FFG blue pillow tick,mink oil lube, but opens up to about 2" three shot group with 50grns, have never shot at 50yds yet.Don't have a chrono and was wandering about what the velocity would be with those loads.