Uncle Mikes for a vertical nylon. Not sure about Bianchi. No longer have my Rugers to tell about the lug. I use this #4 for my Ruger 30 carbine.
L 83042 -
- 7 - 8 1/2" barrel medium and large double action revolvers and 6 - 7 1/2" barrel single action revolvers
Yes you can get conversion kits to shoot .45colt loads in your ROA the bore diameter is actually .452" which is the same as the .45 Colt I would look for a Kirst conversion kit however they are not cheep around $330 if I recall.