I’ll post some info
Everyone wants data but no one seems to want to work for it anymore
I have been loading the 10 since the mid 80’s
From my experience the powder that has the highest velocity potential has been No.9
It’s burn rate and configuration using very small dense ball powder are a plus here.
While this would not be my accuracy pick for all if not most loads, it will get about all you can get out of the 10MM and still keep parts off the track.
Anything much slower and you just can’t get enough of the stuff into the case to get the pressure up to develop the highest speed .
No.9 like No.7, Power Pistol, V-V N350 in the 10 has always been easy to work with for me and with little surprise. Very forgiving as you work them up the power scale
I probably burn more No.7 and N350 than anything in the 10 for a combination of accuracy and power. PP would be a close third.
Some faster medium burn rate powders like Power Pistol, V-V N340, 800-X, HS-6 are great powders and most likely will have an accuracy advantage over No.9
and will run the 10 fast.
But…. are a bit too fast to get the “highest velocity” from them.
At least in any of my testing.
For top accuracy I have had great results with powders like Titegroup, N320 (wildcated)
231 (can be monster accurate) UNIVERSAL (a real sleeper).
Since I recently had such good results using Longshot in my 9x23 Winchester loadings I am starting a whole new load work up with it in the 10, It may prove to be a nice compromise between power and accuracy. Time will tell.
Below are some “Nasty” 10MM load data and speed-readings I obtained using AA No.9
To get these results most if not all the load data is in excess of most if not all published data you would find for the respective loadings.
Rather than risk a problem for someone using equipment I have no idea about.
I have listed the charge weight grains red with a (+) to indicate this load is in
excess of the stated load weight
and published data
THESE ARE NOT STARTING CHARGE WEIGHTS, but the used charge weight “plus” additional weight.
This way as you are working the loads up you can use your chronograph readings for comparison.
These are not loadings which I would operate on a sustained basis.
ALL of the firearms used are either stock or modified using Fully Supported Ramped Barrels.
I would not attempt any high performance loading in ANY gun or ANY caliber the case is not fully supported.
This data is for comparison use in similar guns or platforms
Good Luck (Zoom, Zoom)
Bullet NOS 135 JHP (Accurate no longer recommends using No.9 with this bullet) I still use it though
Powder 17.0 + grs. AA No.9
Primer Fed. Large
Case Winchester
COAL 1.250”
Gun Smith 1006
Chronograph 1522 fps
Bullet NOS 150 JHP
Powder 16.0 + grs. AA No. 9
Primer Fed. Large
Case Norma
COAL 1.255”
Gun Para-Ord
Chronograph 1473 fps
Bullet REM 180 JHP
Powder grs. 14.0 + grs. AA No.9
Primer Fed. Large Match
Case Federal
COAL 1.255”
Gun Colt DGC
Chronograph 1308 fps
Bullet HDY 200 XTP
Powder 13.0 + grs. AA No.9
Primer Fed. Large Match
Case Norma
COAL 1.255”
Gun Colt DGC
Chronograph 1213 fps