Howdy all: I have an Argintine rolling block that has a real bad barrel and I have decided to rebarrel and chamber it for 50-90. I was wondering what twist rate is the standard used by companies like Shiloh, C. Sharps, etc. (1-20)? I also was wondering what barrel manufacturer some of these companies are using, as I plan on using a very heavy non tapered octagon (the width of the receiver). Green mountain's website is the only one I found that indicated they will make a barrel ike I am looking for. Badger, douglas and Kreiger might be able, but I guess I would have to call them to find out. I was just trying to eliminate a little legwork by finding out who some of these other companies use. Thanks for the help. Tom