Major George Nonte was a proponent of converting Model 58's to .45 Colt and .44 Special back in the mid 1970's and wrote about his efforts in the gun magazines of the time.
I think this would be similar to what you are looking for:
I ran across this gun in a pawn shop in north Texas about 10 years ago. The conversion was done by Spokhandguns, which is no longer in business. Vern Ewer, owner of Spokhandguns, did a wonderful job on the conversion. One of the smoothest actions I have felt. Barrel length was 3 1/4".
The biggest negative was that the cylinder was too short for the 454424 or 255gr RCBS KT bullet to be seated normally in a full-length .45 Colt case. That was the bullet I was loading at the time and it worked fine if seated deeper or if .45 Colt cases were shortened.
I also had a 625-6 Mountain Gun in .45 ACP, 4" barrel, of course. The 454424/RCBS KT could safely be loaded to equivalent velocities in the two guns, about 850 fps over my Oehler chronograph.
Comparing weights, the two guns were within one ounce of each other. I forget which was the heavier. With both guns being round butt and of equivalent weights, the only drawback to the MG was the 3/4" longer barrel. The longer barrel did provide a longer sighting radius, and I preferred the adjustable sights on the Mountain Gun.
I hope this info helps you in deciding what you want to do.
I think this would be similar to what you are looking for:
I ran across this gun in a pawn shop in north Texas about 10 years ago. The conversion was done by Spokhandguns, which is no longer in business. Vern Ewer, owner of Spokhandguns, did a wonderful job on the conversion. One of the smoothest actions I have felt. Barrel length was 3 1/4".
The biggest negative was that the cylinder was too short for the 454424 or 255gr RCBS KT bullet to be seated normally in a full-length .45 Colt case. That was the bullet I was loading at the time and it worked fine if seated deeper or if .45 Colt cases were shortened.
I also had a 625-6 Mountain Gun in .45 ACP, 4" barrel, of course. The 454424/RCBS KT could safely be loaded to equivalent velocities in the two guns, about 850 fps over my Oehler chronograph.
Comparing weights, the two guns were within one ounce of each other. I forget which was the heavier. With both guns being round butt and of equivalent weights, the only drawback to the MG was the 3/4" longer barrel. The longer barrel did provide a longer sighting radius, and I preferred the adjustable sights on the Mountain Gun.
I hope this info helps you in deciding what you want to do.
