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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.
The Springfield 1903 has a 1" in 10" twist rate. The later M1 service rifle also has a 1" in 10" twist rate.
You will need to call Browning.
You will need to call Browning or take it to a gunsmith.
Depends on the 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.
Rate of twist on this model is 1 in 9 1/2"
Try the Browning customer service dept at link below
1 in 9
1:16
It will vary with caliber.
1/10