You will need to call Browning.
The Browning 2007 Product Catalog states that the A-Boltchambered for 25WSSM with a 22" barrel has a 1 in 10" rate of twist.
"Twist rate" depends on a particular cartrige the barrel is chambered for. For example: A .30-06 would have a twist rate of one full turn in 10 inches. A .308 would use a twist rate of one full turn in 12 inches.
twist is 1:9
It should be Rate-of-Twist:1-in-12 if you have the 22in barrel Merry Christmas
Rifling imparts spin that stabilizes the projectile. The rate or "twist" determines how much
Rate of twist on this model is 1 in 9 1/2"
1 in 12
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 should be stamped on the barrel
In relation to firearms, it has to do with the rate of rifling in the barrel. Rifling is the spiral grooves that puts a spin on a bullet to increase it's accuracy. "Barrel twist" is the rate of spiraling or inches per turn. That is the length of barrel it takes to spin the bullet a full 360 degrees.
Remington 700 .243 twist rate is: 1 in 10" you can google it like I did.