I have tested two additional load with the RMR 9mm 147gr target HP in 357sig. This time I saw much better groupings, even though I only tried three per string. I have some remaining bullets, so I will chrono these with the following loads:
This time I tried CFE Pistol on the low end using 5.4/5.6/5.8gr, with 5.8gr giving me a 1.08" grouing. The groupings for 5.5gr and 5.6gr were 1.42" and 1.32", also very good. At least now I can confirm that these bullets will work in 357sig and are accurate.
The next load also using the RMR 9mm 147gr target HP bullet is using Longshot.
For Longshot I loaded again 3 strings of 3 each, using 6.5/6.7/6.9gr with 6.5gr giving the best grouping at 1.48". The groupings were consistent with 1.48"/1.60"/1.50". I am showing the 1.50" grouping since Longshot normally likes a bit more pressure, so the higher charge is probably better.
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