You need to see a gunsmith.
The Springfield 1903 has a 1" in 10" twist rate. The later M1 service rifle also has a 1" in 10" twist rate.
It will vary with caliber.
1:16
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.
Blue book of gun values
1/10
1/10
ar-15
Depends on caliber. www.countrygunsmith.net
The Remington Model 66 is chambered for the .22 long rifle cartridge. The most common twist rate for the .22 long rifle is one full turn in sixteen inches (1:16).
1 in 16"
The twist rate in a Browning Mountain Rifle typically varies depending on the specific model and caliber. For example, many of the popular calibers, like .270 Winchester or .30-06 Springfield, often have a twist rate of 1:10 inches. This rate is designed to stabilize a range of bullet weights commonly used in those calibers, ensuring better accuracy and performance. Always check the specifications for the exact model to confirm the twist rate for your particular rifle.