I have shot A LOT of Magtech .357 ammo and it's great.....consistent, powerful, clean, never a failure. I split a case of Magtech .38 special +p and it was the dirtiest ammo I have ever shot......ever....it functioned fine.......but there was so much smoke, you couldn't see the target for a second or two after firing the gun.
I haven't shot any in revolver ammunition but in semi auto, MAGTECH is one of the two manufacturers that I've experienced out of spec ammunition in the past. It jammed the pistol big time. They did replace it.