.223 Sub Sonic

TR Treeman 4 years ago

I have two new projects coming up, .223 sub sonic and .303 sub sonic
Right now, its the .223.
Does anyone have any starting points for this reload?
I am thinking of perhaps a heavier bullet, just to try one up on the .22 subsonic , it will be pointless making a .223 that is no more than a .22 subsonic.
The .22 subsonic heaviest bullet is the 60 gr, but it will usually not stabilize in most .22 barrels, the usual .22 subsonic appears to be a 40 gr bullet.

Will a 70 grain .223 type bullet stabilize at subsonic speeds in a 1-9 barrel?

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TR Tripodmvr

The reason for heavy bullets is that lighter bullets need very small charges so as to not exceed the speed of sound. The extra weight of the bullet needs more oomph and charges then increase in volume and tend to give better consistency and then accuracy.

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Which is the exact opposite of hyper sonic reloading where heavier has less charge than lighter bullets

Correct yes. The whole exercise of going subsonic is a field of its own. The rules that apply are such that it needs careful study and following the recipes that have been found to be safe through practical experimentation.