Sprayed with powder

[barrybrice]

I am having an issue with a load design that I need some feedback on. The problem is that I am getting cover with grains of powder when I shoot my latest custom load. I have recently purchased a suppressor and have developed a subsonic load for it. I have used a chronograph in my development. I have also switched my primers from CCI 500 to CCI 550 (magnum) hoping this would help but it did not make a difference. I feel now that my issue may simply be I am shooting at too slow a velocity. Here are the details:

Glock 26 with Longwolf barrel
SWR Octane 9 HD suppressor
WW lead boolits at 156g
4.0g of Alliant Power Pistol
CCI 550 primer
Average fps is 830

[MarcusT]

A faster powder would burn more completely and have less blowback.

[nwellons]

I've posted about the same thing in the Military forum here about my M1 carbine. Yes, the consensus seems to be about low power loads, which I was developing. Either more powder or a faster powder seem to be the answer but there were a lot of different responses.

You may want to read the posts.

[fredj338]

Yeah, PP is not the choice for low vel loads. It's meant as a full power to +P powder for 9mm. Dropping to something like W231 or WST for sub 900fps loads will be better.

[Larry Gibson]

A faster powder would burn more completely and have less blowback.

That's the answer as mention. Try Bullseye or Unique at the slowest.

Larry Gibson

[runfiverun]

can't blowback if it's burnt.

[rond]

I would try Titegroup.

[Tatume]

+1 on Bullseye.

With Bullseye it should be easy to get subsonic speeds with complete combustion.

[williamwaco]

Don't shoot into the wind!

[barrybrice]

Your tell me! Thank you all for your suggestions. Looks like I'm going to change powder.

[barrybrice]

Problem solved. I purchased VihtaVuori N330 and was able to run some test round today through the chrono for load development. It is a very clean powder and no splatter of unburned powder.