Ruger rifle twist rate?

ottawaguy

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I have a Ruger M77 MarkII, in 22-250 stainless with synthetic stock. I bought it new last year. Anyone know what the twist rate would be?

Thanks
 
I was out yesterday and was shooting tight groups with 53gr Norma's and 55gr superX silver box ammo.

Howerver I really had a hard time with 40gr Federal permium stuff.
 
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