Re: Customizing a Ruger #1
Personal observations and opinions which I may catch flack for:
There isn't much point in free floating a #1 barrel IMHO. It's never made any difference for me. I do quite the opposite and full contact-bed the barrel and forend. I've had my gunsmith drill and tap the forend hanger to put in a set screw by which I can adjust pressure between the hanger and barrel. That's made a major difference in the accuracy of the 3 rifles I've tried it on. The one other thing that seems to help is relieving a little bit of wood between the back of the forend and the front of the action so it's not binding. Between the three, I've been able to get pretty fair accuracy out of #1s, probably on par with most factory bolt actions. 'course, in saying that, I'm comparing out of the box bolt action with customized #1 to get "equality." :-)
One thing about #1s ... generally the heavier the barrel and lighter the stock is, the better the gun will shoot. The #1B seems to be the hardest to get to shoot, the #1H is easiest, and the rest fall somewhere in the middle. The wide forend on the 1B and 1V allows more torque against the forend hanger which causes groups to open up. The narrower forend on the #1S and #1H seems to help them shoot better. I haven't messed with the #1 international and only a teeny bit with the #1A.
Flex is for people who don't have lockers.