Just got it in a second ago. I had sent an SB2 receiver to have one fitted. I wanted to use an SB2 should I decide to "head off the beaten path". They will hold loads over 60k so unless i start filling cases with bullseye, i should be safe with pretty much anything a sane person might try.
Out of the box, i was happy with the fit. Snug but not too tight. Lock up is easy and strong. Barrel is pretty heavy. 3/4" at the muzzle.
I am not happy with the 8 groove rifling. That's gonna be an obstacle with cast lead.
I will be starting with an RCBS 35-200 and 2400, Unique and maybe 4198.
If you've walked down this road, chime in anytime please. Wish me luck!