I had my S&W mountain gun ported by magnaport and also ported my 44 SBHH and I shoot hard cast thru both with no problems. Just be sure when cleaning to not forget about the ports. I found a small nipple brush at a gun show (one of the military tables) and it works great for cleaning the ports, as do the pipe cleaners. I would imagine if you were shooting excessive amounts of cast you could have a buildup problem, but a hunting handgun is not a "race gun". Just keep up with your cleaning and enjoy!!