I believe that the twist rate was 1 in 10.
Your rifles twist rate is one turn in 9inches/1 in 9.this is for a 223 cal
1 in 9
The rate of twist for a Remington 788 in .243cal is 1 in 9 which is one complete turn of the bullet in nine inches
1 in 14"
1/10
1:9
This rifle was built by Mossberg and was labeled the 800B. The "B" series was sold thru Montgomery Wards and other large reatilers. All Mossberg model 800 .243 rifles manufactured had a twist rate of 1 in 10. So I believe it is safe to the twist rate is 1 in 10.
1 and 48 twist
10 USD
You will have to measure it. Hammer-forged barrels made by Baikal can have quite a bit of variation in the rate of twist. I have a Baikal .243 that was supposed to have 1:10. I measured it, and it is actually 1:8.6!!
1:28