Share your 300 Blackout Loads here>

[Jon L]

4198 seems ok also, but use the H version.

Any particular reason why?

The reason I ask is wideners has bulk Swiss powder that is basically IMR 4198, but I don't know the differences between the H version and IMR.

[300Blk]

H has 1/2 the stick size. IMR has less hope of metering.

The Swiss stuff you are speaking of could be either.

[Jon L]

H has 1/2 the stick size. IMR has less hope of metering.

The Swiss stuff you are speaking of could be either.

Thanks Robert.

What is your preferred sub-sonic powder?

[300Blk]

So far A1680 or RE7 for ARs and seems like 4198 is about the same but I have not done much testing.

[82nd airborne]

1/4oz of RDX works nicely for supersonic. It will get a 220g up around 3,000 fps if you compress it reaaal good!

[Alangaq]

H has 1/2 the stick size. IMR has less hope of metering.

The Swiss stuff you are speaking of could be either.

Robert IMR 4198 and Hodgdon H4198 have slightly different burning rates and are not 100% interchangeble load to load. I also think the extruded powder kernals are essentually the same dimention... perhaps you are thinking of H4198SC which stands for Short Cut?

[300Blk]

I also think the extruded powder kernals are essentually the same dimention... perhaps you are thinking of H4198SC which stands for Short Cut?

http://www.hodgdon.com/extreme.html

"The kernels were shortened for improved metering"

[BachelorJack]

So far A1680 or RE7 for ARs and seems like 4198 is about the same but I have not done much testing.

What's your data for RE7?

[300Blk]

Like anything else - start with a lot, over 11 grains, and then load down to 1000 fps.

[82nd airborne]

I think I was using 11.3g or RE-7 with a 220 smk loaded to 2.090"