How much Dacron is too much

[Marlin Junky]

I'm trying to use WC-820 in my 358 with .360" RCBS 35-200-FN (208+ bare weight/BHN 15-16 after aging) and am thinking a little better burn might tighten the groups somewhat. I've gone to 21 grains and the accuracy seems to be going downhill at 1700-1750fps with this boolit hardness and my 1:12" M77 (cases are still smokey at this level). 20 grains seemed to show promise but flyers made one hole groups out of the question.

So anyway, I'm thinking about trying 19 grains of WC-820 and approximately a full grain (or whatever it takes to boost the pressure a bit and hold the powder in place) of Dacron to keep this extremely fine grained powder in place. Velocity goal is in the 1650fps neighborhood.

MJ

P.S. WC-820 proved to be a good powder in the 30-30 with 16.0-16.5 grains and no filler under RCBS 30-180-FN (circa 1650fps)

[41 mag fan]

Hey Marlin...put this in the filler thread i started in the favorite loads section. I'd love to see what Larry has to offer on this, as well as some other members.

[Green Lizzard]

i had to give up on using filler with 820, after a several tests and exprements i found it was filtering down through it. it is just too darn fine, i still love it for 30-30 and 357 mag

[Marlin Junky]

i had to give up on using filler with 820, after a several tests and exprements i found it was filtering down through it. it is just too darn fine, i still love it for 30-30 and 357 mag

How densely did you pack it? In other words, how many grains of Dacron in what cartridge case?

MJ

[41 mag fan]

Read the sticky in the favorite loads forum on fillers. Read what larry and 338 wrote. It was very helpful to me when I was looking for info and such.

[Larry Gibson]

MJ

Try 3/4 gr Dacron and increase it 1/4 gr at a time until the WC-820 no longer migrates. That will be enough. I've not used WC-820 with reduced cast bullet loads but I have worked with other fine grained ball powders. I think you find enough to be in the 3/4 to 1 1/4 gr range.

Larry Gibson

[Marlin Junky]

MJ

Try 3/4 gr Dacron and increase it 1/4 gr at a time until the WC-820 no longer migrates. That will be enough. I've not used WC-820 with reduced cast bullet loads but I have worked with other fine grained ball powders. I think you find enough to be in the 3/4 to 1 1/4 gr range.

Larry Gibson

Well Larry... I kinda went hog wild tonight and loaded ten rounds with 2 grains and ten rounds with 2.5 grains after backing my last powder charge off from 21.0 to 19.0 grains. We'll see what happens Monday morning.

MJ

[sthwestvictoria]

This much is too much:
http://www.oregonphotos.com/Resources/Holubar-Paragon-Parka.jpg

[sthwestvictoria]

This much is too much:
http://www.oregonphotos.com/Resources/Holubar-Paragon-Parka.jpg