Here’s the finished 9mm Major top end that John from http://www.jplprecision.com built for me.
Just took some different 9mm Major recipes with me to test. They were :
- RP 9mm Once Fired Brass
- 124gr Montana Gold CMJ
- Winchester Small Rifle Primer
- 8.5 – 9.0 gr of Hodgdon HS-6 Powder
- OAL : 1.165
I started with a 8.5gr load and worked up to 9.0 but we didn’t need it. If you look at the chart below, even 8.5gr of HS-6 was wayyy over the required powerfactor.
John’s load is a 7.6gr Silhouette behind a 121gr IFP round.
| 8.5gr HS6 | 8.6gr HS6 | John’s | |
| Ave. FPS | 1450 | 1467 | 1476 |
| PF | 180 | 182 | 183 |
The new KKM barrel is tight and very fast. Looks like I have to dumb down my loads to probably 8.2 or 8.3 gr of HS-6 powder.
Loke, my load was a 121 gr. MG “international” bullet. Powerfactor is something like a 178.5.
-JPL
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