USPSA load question [Archive] - Glock Talk

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Billy_Ray
09-22-2012, 07:05
I have been running my USPSA load as follows for production:

9 mm - 124 grain FMJ
4.2 grains of Titegroup
OAL 1.13

I had figured based on others comments and the reloading manuals that this would produce approximately a 127 - 129 power factor, giving enough safety margin to always be over. But at a recent match, they had a chronograph setup and my load chroned at 1103, 1105 and 1106. Meaning my load is running a PF of 137. Based on this I think I can drop my powder to 4.0 grains of TG. I know that this is just one data point, but I am looking for some input, what say you?

Thank you,
Billy Ray

SJ 40
09-22-2012, 07:40
I think the best thing to do would be invest in a chronograph. For what you are doing it will give you the answers you are looking for,without waiting until you get to a match to find out. SJ 40

jdavionic
09-22-2012, 08:00
Here is some of the data that I recently posted. All fired from a G19 in an indoor range (temp 74).
124 gr MG PHP
Titegroup 4.1g
Avg OAL 1.117
Avg vel 1107 fps
PF = 137

124 gr Ranier PHP
Titegroup 4.1g
Avg OAL 1.127
Avg vel 1100 fps
PF = 136

124 gr Ranier PHP
Titegroup 3.9g
Avg OAL 1.127
Avg vel 1054 fps
PF = 131

Be mindful that I am using different bullets than you are. With that said, I agree with the other gent (SJ40). If you're trying to fine tune closer to the minimum PF, you should get a chronograph.

Zombie Steve
09-22-2012, 08:15
Helps to know what gun / barrel length you guys are shooting from if you're posting velocity. May not translate well from one gun to another.


Where's Little Stevie? He's all about them squeaker loads.

:supergrin:

Hoser
09-22-2012, 08:21
That is almost my exact same load, only I use the 124 JHP.

Maybe bump it back a hair, but if it is working and accurate, dont change a thing.

shotgunred
09-22-2012, 09:02
Back when I used tight group my load was 4.1 tg with a 124gr at 1.125 OAL. It chronos around 1110 at sea level.

Colorado4Wheel
09-22-2012, 09:16
I wouldn't drop it more then .2gr. Personally I would drop it .1 and call it good.

Billy_Ray
09-22-2012, 10:11
I am shooting a Glock 17 if that helps.

I was thinking of lowering the charge by either 0.1 or 0.2 grains. 0.1 is probably the best way to go.

Thank you all for the feedback.

Billy Ray

shotgunred
09-22-2012, 11:20
Do you think you would notice the difference of .1 grain?

Boxerglocker
09-22-2012, 13:23
I have run 4.0 TG with a 124 FMJ at an OAL of 1.135 since I started loading for IDPA/USPSA.

Chronos 1150 Fps average out of my G34 (142 PF) in my G19 back-up (carry it will drop to about 1080 (134 PF).

km625
09-23-2012, 09:44
I have run 4.1 TG with a 124 FMJ at an OAL of 1.135 since I started loading for IDPA/USPSA.

Chronos 1150 Fps average out of my G34 (136 PF) in my G19 back-up (carry it will drop to about 1060 (131 PF).

Your G34 velocities and PF are correct for 115gr bullets. With 124gr bullets they come out at 142PF. Only noticed because I use 124gr at 1100pfs (3.9 TG) and that yields 136.

Boxerglocker
09-23-2012, 11:30
Your G34 velocities and PF are correct for 115gr bullets. With 124gr bullets they come out at 142PF. Only noticed because I use 124gr at 1100pfs (3.9 TG) and that yields 136.

Your correct. I copy and pasted the wrong load out of my reloading data spreadsheet. Post changed. Thank you

sciolist
09-23-2012, 20:56
My 34 runs fine on 130-132PF. I've experimented with 124 loads from the high one-teens up to 150PF or so, for USPSA and Steel. There's a pretty noticeable difference in feel between low 130's and high 130's.

Low 130's works well for me.

MoNsTeR
09-24-2012, 20:52
I think you could safely drop it a tenth, but a little more power is going to take down poorly-calibrated poppers just that much better.