I'm not sure where to post this, so I'll do something, even if it's wrong.
Numrich Gun Parts Corp currently has .357 rolling block barrels, 20 7/8" long, $40.20 + $1.00 handling. Free shipping if you order 2 or more.
I figured they could be cut in half to make two 10" barrels. Anyone interested would have to call
to get the twist rate and availability.
Numrich Gun Parts Corporation Phone: 866.686.7424 Fax: 877.486.7278
The only other barrel blanks I found in .357 are available at Green Mountain Barrels.
25" long, 1:20 twist, $97.95 + $20+ shipping for one barrel. The more you buy, the less per barrel shipping.
A friend is thinking of building an AR-15 in .350 Legend caliber is the reason I am looking.