What size mold do I need for a 300 blkout would it be .308
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What size mold do I need for a 300 blkout would it be .308
Attachment 1421
Pretty much any of the molds on the top row could be used for 300 BLK. The bullets will drop out at .309-.311 depending on the alloy.
I don’t know if your looking for a subsonic round or a supersonic round. I am assuming subsonic, in which case the 200-230gr options are your best bet.
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I'm powder coating Lee's c309-160-R, using 18.0gr of 2230 and averaging 1492fps in a 16" barrel and 1315fps in a 7 1/2" barrel.
My BHN11 alloy is dropping at 166gr, gas checked before coating and resized at .309" after coating, OAL 1.940".
Resizing for consistency and expanding the case mouth is usually a must. This reduces shaving the bullets or damaging the case neck when seating the bullet.