22BRT Chronographed

[mturner]

I just got through doing a little testing on the 22BRT. Some of the loads were a little on the hot side, but none of these loads loosened the primers. This is how I test the hardness of the case head! However, I would consider 3650 fps maximum. It seems that the 22 Waldog is run around 3500-3550 fps to be in tune, although there may be a higher accuracy node. My loads with N133 seem to be right around the velocities achieved with the Waldog. My barrel length is 23", and it was a little cool at 60 degrees. Each velocity is a single shot over a 35P with 6' screen spacing, not an average velocity. It is unreal to me how these little cases can come close to the velocities of a 22-250.

22BRT - 52gr Sierra - 60 deg.

25.5 - 2015 - 3733
26.0 - HBMK - 3405
27.5 - HBMK - 3610
25.0 - N133 - 3434
25.5 - N133 - 3507
26.0 - N133 - 3576
27.0 - 4895 - 3683
29.2 - W748 - 3665
26.3 - 4320 - 3258
27.3 - 4320 - 3380
27.8 - 4320 - 3506

2015 is older Isreali made.
4895 is Hodgdon.
HBMK is Benchmark