Subsoninc 308 load data Q's


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bkjeffrey
December 12, 2010, 09:43 PM
Im quoting this from another forum member in an different thread. I thought I would bring the discussion to the appropriate subforum.

Im looking at loading up sub-sonics for my M1A and I heard this in a discussion about the M1A:

When I shoot subsonics in mine, handracking is required.
For subsonics I use 8.8 grains of trailboss and sierra 150 grain flatpoint 30-30 bullets.

My thoughts....
Trail boss has a density of .328 g/cc. 8.8 gr of trail boss in a 308 with a 150 gr bullet (flat base round nose) will fill 46% of the case. It will be stable in a 1:12 and 1:10 and is subsonic.

How will this same load perform in a 1:12 twist 24" tube?

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