New barrier blind ammo.

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jivesister
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New barrier blind ammo.

Post by jivesister » Fri Oct 09, 2020 5:36 pm

Loading 130 grain SOST MK319 for 300 Blackout. Any suggestions for overall cartridge length. I am using H110 with Winchester small rifle primers. I have not range tested as of yet. Just loading dummies at different lengths and measuring to my
magazine. The length which measures the best is O.A.L. of 2.155 inches. Measuring some commercial loads they have been as short as 2.145 inches.

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dellet
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Re: New barrier blind ammo.

Post by dellet » Fri Oct 09, 2020 11:16 pm

That bullet has been tried a few times over the years, I don’t remember anyone ever getting steller accuracy.

search.php?keywords=130+sost

search.php?keywords=Mk319

I would start around 17.5 of 296 with bullet .010” off the powder and work it up with the same density, bullet powder relationship, to around 20 grains or pressure signs.
300 Blackout, not just for sub-sonics.

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