Why fast powder for light loads? [Archive] - Glock Talk

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d123gaw
05-28-2014, 22:46
Can someone please explain why faster powders are desired for lighter recoil, slower loads? (I'm working on some .40 target loads)

I understand slow powders having more burn time in high power loads but I can't wrap my mind around the fast powder slow load thing.

WeeWilly
05-28-2014, 23:13
Can someone please explain why faster powders are desired for lighter recoil, slower loads? (I'm working on some .40 target loads)

I understand slow powders having more burn time in high power loads but I can't wrap my mind around the fast powder slow load thing.

Fast powders allow you to keep pressures up while producing lower velocities. Lower velocity means less recoil. Pressures up near max mean cleaner more consistent burn.

fredj338
05-29-2014, 02:05
^^^This^^^
All powders need a certain pressure level to burn completely. If you are trying to get low vel loads, a faster powder reaches efficient burn more easily.

d123gaw
05-29-2014, 06:07
I think I got it! Thanks guys.

happie2shoot
05-29-2014, 06:12
Some do it because it's cheaper, uses less powder.

In the 454 I use 8gr for light and 26gr to 39gr for heavy.

creophus
05-29-2014, 09:00
Some do it because it's cheaper, uses less powder.

In the 454 I use 8gr for light and 26gr to 39gr for heavy.

Also, to that point, the amount of powder in the case, also goes out the barrel along with the projectile contributing to recoil.

All things being equal, less powder will also mean less recoil.

d123gaw
05-29-2014, 11:05
Good deal.
I've been playing with some 3.5ish grain bulls eye loads behind a 165gr berry and I like what I'm seeing.
Thanks again!

Steel Head
05-29-2014, 11:49
Fast powders allow you to keep pressures up while producing lower velocities. Lower velocity means less recoil. Pressures up near max mean cleaner more consistent burn.

Nailed it!

I like WST for my 40 target loads.

ChrisJn
05-29-2014, 12:55
Yes you might wonder. It gets swept up over time and gathers in cracks in the concrete floor:-

http://londonphotography.biz/movie2.wmv

poodleplumber
05-29-2014, 13:27
Yes you might wonder. It gets swept up over time and gathers in cracks in the concrete floor:-

http://londonphotography.biz/movie2.wmv

I'll be danged. I wouldn't have believed that without the video.

attrapereves
05-30-2014, 14:33
You can use a slower powder at lower velocities, but it's best to find a powder that will be loaded near max for the velocity you are seeking.

I used AA#5 for 230gr 45ACP for a while, but as I was only wanting velocities to match factory ammo (800-850fps), I was getting a lot of unburned powder and soot. I switched to a faster powder that I could load near max and it cleared right up.

breacher1
05-30-2014, 15:12
I dropped down to 4.5 gr of Power Pistol with a 40 cal 180 gr Berrys plated and it was very soft and accurate. It barely runs my G35 with a 14 lb recoil spring. The cases were pretty sooty after. I figured if I can't find any faster powder for light loads I should at least use heavy bullets to keep the pressure up a bit.

fredj338
05-30-2014, 17:54
Yeah, PP would not be my choice for 40 minor loads, too much blast & will not burn as clean as running it over midrange. For all medium burners, run them well above midrange levels for best results.

breacher1
05-30-2014, 22:12
Exactly. Seems like all the powder I've been able to find the last few months has been on the slow end of the scale. I have one lb. of Win. WST set aside for the NRA PPC Nats in Sept, love that stuff. Wish I could find more.

fredj338
05-30-2014, 22:44
Exactly. Seems like all the powder I've been able to find the last few months has been on the slow end of the scale. I have one lb. of Win. WST set aside for the NRA PPC Nats in Sept, love that stuff. Wish I could find more.

Ha, you & me both! I have about 4# left, saving it for sanctioned idpa matches. I have broken out some 15yr old powders to make practice ammo. Hopefully things get better after the nov elections.:crying: