I had the forcing cone lengthened to 11 degrees on a 25-10 45 Colt and a Colt saa 45. It helped the Smith some and the Colt took to it like a duck takes to water. It made the Colt a tack driver.

I was told by a great gunsmith that if he lengthened the Model 25-10 out enough to completely clean the forcing cone up, that it could cause the bullet lube to blow off.