I recently purchased a really nice used Vaquero. It had been well taken care of and the gun store guy told my it was used by a cowboy action shooter. What I have noticed is that he apparently shot exclusively .38s in the gun. It shoots them very well. But when I tried to shoot the longer .375 Magnum they only go as far into the cylinder as a .38 would and that is it. I brushed it long and hard with a stainless steel brush, and it is lots better, but only brass cases will go all the way in, nickle ones won't. What are my options with this cylinder to get .357 bullets to work well.