38 special unburned powder...

[MightyMO1911]

So we have an old can of Winchester 571 powder and I looked up an archived edition of the Winchester loading manual.

We wanted to find a 38 special +p load to shoot in our Ruger GP100. This old manual shows a charge of 7.7 grains of 571 behind a 158 grain lswc.

We loaded several rounds and they shoot quite well. Soda cans filled with water just couldn't bare the strain. No signs of pressure issues at all and on top of that, no leading either. However. There is unburned powder left in the barrel. My thinking is this powder is a tad too slow for this application but I wanted a second, third or hwy, however many more opinions I can get.

 

[rcmodel]

It may not be unburned.

It may be powder skeletons or ash left from the powder granules.

It is quite common with some powders like 2400 & Unique.

rc

 

[Haxby]

It's a slow powder for this application. A magnum primer might help clean it up.