IDPA Power factor info

[sauer1911]

Just returned from the Prado Olympic shooting range, testing some hand loads for IDPA shooting.

9mm, 124g rainier copper plated, 4.2g Hogdon titegroup, 1.115" oal, mixed brass.

each group of 10 shots, from approx 10ft from chronograph. Shot with a Sig 226 9mm.

1- 1074avg
2- 1077avg
3- 1063avg

1071avg x 124gr =132,804 or power factor over 125,000!

light recoil, perfect.

same setup with NEW Starline nickel brass

1- 1066avg
2- 1071avg

1069 avg x 124gr =132.556 again clearing the power factor and light recoil.


Now with .45acp, 230gr precision dynamics plated round nose, 6.0gr Winchester Autocomp, mixed brass, 1.27" oal.

8 rounds each test, shot with a Sig 1911 TTT.

1- 768 avg
2- 749 avg
3- 761 avg

759avg x 230gr =174,646 meets minimum power factor of 165,000 for IDPA

smooth light, recoil

same tests with 6.4gr of Autocomp jumps way up there

1- 846 avg
2- 839 avg
3- 848 avg

844avg x 230gr =194,196 power factor. still not bad recoil, but kinda hot for me to shoot good IDPA matches

This is what I got for my reloading info, your milage may vary, but this might help if you dont have access to a chronograph.

be safe.

 

[gahunter12]

Looks like you collected some good data today. I'm thinking about picking up a Glock 34 to try out. I shoot Glock 35's for SSP, and ESP. My .40 loads shoot a PF of 131 at 730fps, 180gr X-Treme RSFP. I had to cut 2 coils off a 13lb spring to level the muzzle properly, but it shoots like a 22LR!

 

[sauer1911]

Thats good to know.

Now, where can I get more info on tailoring the springs in my guns for smoother action? I am using stock from the manufacturer set up.

What is the benefit of or what happens when you soften your spring with a lower power load?

What are the stock springs set at?

INQUIRING MINDS WANT TO KNOW

be safe

 

[gahunter12]

Here's a great wealth of info for IDPA, and USPSA shooters. You can scroll down to the Spring section for some great tips. http://www.brianenos.com/forums/index.php?

In a nut shell when I dropped .3gr below Min charge of WST my slide would function properly. The slide was also too slow to double tap or triple tap. Also if your gun has too much spring it will nose dive the muzzle causing your second, and third shots to be lower than the first. If you don't have enough spring the slide will move rearward too fast, and hard, returning to battery will be slow and the sights will not drop back on target causing your second, and third shots to be high. By removing a coil or two you can fine tune your spring. For example a 11lb spring is too soft, but a 13lb spring was too stiff for tight groups on double taps.