CZ 550 twist rate ?

[luke631]

Hello all,

I have an older CZ 550 FS in 308 win. with a 20". barrel.

Would anyone know the twist rate for theis rifle?

Merry Christmas everyone!

Thanks

[rdcinhou]

 I did a little digging to find this article online.  The website comes up slow and with a fair amount of ads.  It is a good read about various loads and how they performed.

https://www.shootingtimes.com/editorial/longgun_reviews_cz550_080307/100350#:~:text=This%200.469%2Dinch%2C%20100%2D,95%2Dgrain%20Ballistic%20Tip%20load.

Here is a quote from it:

The CZ's 1:10 twist barrel showed a clear preference for heavier 6mm pills. Federal's 85-grain Barnes load averaged 2.61 inches while my friend Kerry O'Day's favorite load with an 85-grain Sierra at 3190 fps did only slightly better. However, considering this rifle is far more appropriate in the deer woods than as a predator rifle, I'd say that's a good thing because in my experience, the .243 is most effective on deer with heavier bullets.