Ruger No.3 in 223

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I've had a No. 3 in .223 for just about thirty years. Got it new in 1980. I used various out of the box 55gr loads, both commercial and military and it would shoot MOA @ 100 yds. I never tweaked it or did anything else.
 
Mine is 1:10 by actual measurement. I had it rechambered to .220 Swift and it loves the 50 grain Branes Varmint Grenade.
 
How to tell the twist of a rifle.
Put a snug fitting patch on the jag and insert the rod in bore. Make a mark
@ 12 o'clock on the rod at the muzzle. Pull rod out slowly until the mark is
@ 12 o'clock and measure the distance from the mark to the muzzle. The resulting measurement is the twist of your rifling, ie. 1 turn in ____".
There could be some slippage between patch and rifling, but this is close enough for government work.
 

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