10mm handgun loading info


The Grumpy Grease Monkey mechanical engineer.
Staff member

obviously any gun you trust , for defensive use and any ammo you use,
must be very carefully and extensively tested for consistent function before serious use
glocks design intentionally favors reliable single use, function with new factory ammo,
and has little concern with handloads or brass re-use.
obviously your life might depend on totally reliable function, so test your equipment & ammo

ID strongly suggest you use an aftermarket 6"-6.6" aftermarket barrel for your glock as the brass case is much better supported in the
aftermarket barrels chamber, and the extra about 2" of added barrel length should add about 75-100 extra FPS in projectile velocity
and conventional rifling works far better with use of both both cast and jacketed bullets



Here are some Blue Dot loads that worked for me in my G20SF:

Rainier 180 gr. Plated HP
10.9 gr. Blue Dot
1204 FPS

Hornady 180 gr. HP/XTP
10.9 gr. Blue Dot
1173 FPS

Hornady 180 gr. FMJ-FP
11.0 gr. Blue Dot
1224 FPS

Hornady 200 gr. HP/XTP
9.5 gr. Blue Dot
1104 FPS

Hornady 200 gr. FMJ-FP
9.5 gr. Blue Dot
1104 FPS (This is not a typo, MV was exactly the same as the same powder charge with the 200 gr. HP/XTP bullet)
the SPEER 200 grain is the preferred defensive projectile as it consistently expands well at the correct velocity ranges

in all handload data you'll see, a balance or compromise must be found between bullet weight
, jacket thickness, velocity and expected expansion and consistent .
repeatable accuracy at reasonable pressure

in the 10mm you find the aftermarket 6"-6.6" barrels provide much better chamber support ,
and usually provide increased accuracy

making swapping to them a good idea, if you want to gain max performance.
keep in mind the tighter chambers ,more precise rifling tighter throats that promote better accuracy,
and in some cases, barrels with steeper feed ramps on aftermarket barrels
can marginally reduce functional reliability , with some bullet designs,
so polishing feed ramps and proper lubrication and choices made,
in bullet profiles can effect reliable , repeatable feed an repeatable function

All loads were loaded to a COL of 1.260" in once-fired Starline cases
All loads were bench tested at 25 yards with 5-shot hand held groups
The Hornady 180 gr. HP/XTP loads and the Hornady 200 gr. FMJ-FP loads produced the best accuracy, averaging around 2 1/2"
All loads using the Rainier bullets would not shoot accurately with any powder used, including Blue Dot, Longshot, and W231
None of the other loads provided good accuracy, averaging 3" to 4"

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solid fixture here in the forum
I had a hard time finding a 6 inch barrel for my Sig Scorpion 1911 in 10mm I finally found a Nighthawk custom barrel but on this one I have to fit the barrel with the barrel bushing a gunsmith I know is going to guide me through it and oversee me while I'm doing it and he has all the jigs and things needed to do 80% 1911s that he wants to sell me but I'm still not to the point where I trust it enough to do it allthough I would like to build a couple for practice


The Grumpy Grease Monkey mechanical engineer.
Staff member

a cast gas check bullet like this above generally feeds much smoother than a jacketed bullet like this below

as always precise shot placement is critical with any handgun to get good results.
a good hard cast gas check bullet will generally out penetrate most jacketed hollow point bullets,
and what surprises many is cast gas check bullet can be exceptionally
the 175-200 grain 10mm and 158-170 grain 357 mag cast bullets tend to be more accurate than lighter weight bullets
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