Reloading Subsonic 300 Blackout

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Pulp

Sharpshooter
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You might give Trail Boss a try. It's an excellent choice for low pressure, light recoiling loads. Note: Never tried it in your caliber, but I made up some .223 practice rounds for my granddaughter that were roughly equivalent to .22Mag, and I've used it in .45-70, .45Colt, .45ACP and .44-40 with excellent results.

Check the Hodgdon's website for loading information.

Here's the link for loading Trail Boss:
http://www.imrpowder.com/PDF/Trail-Boss-data.pdf
 
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