you will need to call Browning.Browning chose a 1"in 14"twist rate for all rifles chambered in 22-250 caliber.
The Browning 2007 Product Catalog states that the A-Boltchambered for 25WSSM with a 22" barrel has a 1 in 10" rate of twist.
It should be stamped on the barrel
Try the Browning customer service dept at link below
Impossible to answer without knowing the caliber.
I think 1 in 14, this is because it is intended for light bullets 50 gr and under. It would be cool if the twist was faster and you could shoot heavier bullets effectively but there would be way tooooooooooo much heat for that little barrel and it just wouldn't last!
Rate of twist on this model is 1 in 9 1/2"
1 in 14
The "rate of twist on rifling" is caliber specific. To give you an answer we would need to know which cartridge the rifle is chambered for.
It may be different depending on the year and the caliber, but recent catalogs show that the few A-Bolts witha 24" barrel have a rate of twist at 1-10"
According to this web site: www.exteriorballistics.com/reference/pdf/Twist%20Tables_Rifle.pdf It is one turn in 9"
Browning,s home page should contain this info.
According to Linda in the customer service department at Browning Winchester at (800) 945-5237 the 12 Ga models have a 1 in 28 twist rate.