Inherited a browning B.B.R 300WM Need some info.

[Proxemus]

As title stated, i inherited a browning B.B.R 300 WM. I Reload my own ammo and im trying to figure out what twist rate this gun is and for the life of me i cant get a straight answer. I want to start reloading my own shells for this but i dont wanna buy lead w.o knowing what the twist is.
Serial number is 12029PM117
Thanks alot.

 

[cooper_257]

you can measure the twist with a cleaning rod. most factory rifles in 300 WM are going to be 1:10" twist

 

[Proxemus]

you can measure the twist with a cleaning rod. most factory rifles in 300 WM are going to be 1:10" twist

i tried doing that but i kept getting inconsistent results. Ive read somewere its either 10:1 or 12:1 But by ur information its probably 10

 

[Lost_Phil]

Here is a brief history of the BBR Rifle. I believe that the same plant that was making these for Browning was also making the Wetherby rifles as well at that time. They were a superb rifle back in the day and had very good quality and workmanship.

It will have the short SAMMI chamber for 300WM, so you will be stuck with short stubby bullets and the twist rate is 1:10. I would copy the
A191 or MK 248 Mod 0 load for target and use the same load with a 190gr hunting bullet for Elk slaying.

 

[Rookie]

Measuring twist as Cooper said is not difficult to see difference between a 10 and 12 twist. Beautiful rifle BTW.