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Most manufacturers use a rate that'll stabilize the heaviest commercially available bullet. The problem is that it's too fast for the average weight bullet to attain the best accuracy. It's clear that Ruger calls this rifle in 22-250 a Varminter. I bet if the twist rate was fast enough to stabilize a 77 grain deer bullet that you wouldn't put all of you varmint bullets in the same hole.
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This is incorrect
You cannot overstabilize a bullet to the point where accuracy suffers that much. some of the best 55 gr groups I have shot were shot with an out of the box 8 twist 223, what you'll see is better terminal performance due to the increased spin.
Its called the number 1V because it has a heavier varmint weight barrel. velocity has as much to do with the needed twist as bullet length does.
I have 2 #1's, a 22-250 #1V, and a 270 wea. mag #1B, they shoot well enough, but due to the forend pushing against the barrel , they need a bit of work on bedding and fore-end tension to rival a good bedded floated bolt action.
The triggers are heavy and are missing an adjustment for sear engagement, and the 2 visible adjustment screws don't seem to change anything.
RR