Military Guns and Ammunition

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long range subsonic ammo   General Military Discussion

Started 7-Mar by smg762; 192 views.

From: smg762


given that 300 black is the best subsonic ammo, and is still fairly short ranged, i had an idea for a round that can be subsonic but far longer ranged,

the 300black has 450ft lbs subsonic, at 220 grains. practically your limited to about 70m

the 9x39 has a heavier 280grain, and thus can stretch further to 720ft lbs. but of course the bullet has an awful BC

so i thought if you had a 6.5 or 7mm bullet, with an extreme VLD shape, which is very heavy, like 280 grains. clearly the bullet must be ultra long.

this would allow the full 720 ft lbs energy, and the BC would make it more of a 200m round. 

any thoughts?

In reply toRe: msg 1

From: EmericD


The "short" practical range of subsonic ammo is linked to the rainbow-like trajectory, which is a direct consequence of the low muzzle velocity.

Of course, you could always try to reduce the drag of the bullet (using a SWC nose shape and a very long boat-tail), saving 1 or 2 mRad of bullet drop, but you're not going to dramatically increase the practical range.

In reply toRe: msg 1
Mr. T (MrT4)

From: Mr. T (MrT4)


There are a number of subsonic calibers up to .50cal . VLD bullets are not the best for subsonic applications ,

Instead what is missing are more  subsonic optimized designs with more weight  and less pointy tips , remember .300AAC OAL is very limiting , you can find 250grain bulllets in 30 cal but can't use them as they are to long

Stumpy nosler doesn't suffer much from bad BC and also expands on target. Rainbow balistic curve can be accounted for, one thing kinda surprising is how small the wind drift is at subsonic, for so the other component is energy on target

Note how different the shapes optimized for subsonic use are compared to VLDs