[Sn1911]

Lyman data suggested start 23.4 grain of varget and 26 gr max at 2.26″ col for similar bullet (69 gr sierra)
my load 24.7 gr Varget, col 2.255″ , LC brass , rem 7-1/2 primer , no crimp , 1/4 group at 100 yards, Vel 2720
or 25.0 gr of CFE223 col 2.255″ , Frontier brass , rem 7-1/2 primer , no crimp , 3/4 group at 100 yards, Vel 2740

[Sn1911]

I used the Sierra 125gr JHP ( part# 8125) data when I developed my load with 124 gr RMR-MPR and later RMR Nuke.
I don’t have the actual sierra bullet but if you go the Blue Collar reloading website , it listed the 125 gr Sierra JHP OAL is .554″, the RMR Nuke OAL is .545″ so they are similar.
Lyman book suggested COL 1.075″ , HP-38 start load at 3.9 gr and Max load 4.4 gr.
I loaded RMR nuke COL 1.040″ which scary short for my CZ, I start my load at 3.6 gr of HP-38 and worked up to 4.0 gr. It shoot reliable without any sign of high pressure.
I don’t have chrono data for these load with HP-38 but I do have some data with N320 powder, hope it help.

124 gr RMR-Nuke- Win case , CCI primer
COl 1.040″, Vihta n320
3.4 gr average 927 FPS
3.7 gr average 983 FPS
3.8 gr average 1012 FPS

[Sn1911]

I loaded the 124 gr RMR-NUKE with Hp- 38, COL 1.040″ for my Rami and Cz Ts2. Start load at 3.6 gr and work up to 4.0 gr . I did not chrono any of these load .
recently and try with Vihta N320 col 1.040″ start load 3.4 gr chrono 927 fps and worked up to 3.8gr of N320 chrono average 1012 FPS.

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