Mag-na-port International--The Mag-na-port Process: Handgun Porting
Here is what they look like cut into the end of the barrel on a S&W 25-5 chambered in 45 Colt. I shoot hardcast 255gr semi-wad cutters out of it at about 850fps. The porting keeps the muzzle jump down. This gun and bullet combo is devastating to bowling pins. I imagine it would most likely go end to end on a deer. Sometimes big and slow is much more impressive than small and fast.
bob
I had a magna-ported barrel for my S&W 29 but cut it down to 5", same as my 625. Wanted to use it as a sparegun for IPSC. Love revolvers