.223 Subsonic

This thread really seems to be about solving a non issue. All centre fires that can legally throw a subsonic .22 cal pill are bolt or lever action. Throwing a pill that almost certainly won't expand like a pure lead hollowpoint 22LR sub will. If centrefire semis were still around, they would not cycle with subs.

A .22 semi will permit you to rapidly throw 10 x 42 grain lumps of beautifully expanding lead at whatever quarry you are after.

For a centre fire to be capable of throwing a useful size lump of lead at a pest, you need to be starting at 30 cal.

Only mtcw.

I was purely thinking(maybe not) of sending a double weight of lead at the bunny!! 40gn .22 and 75gn .223. Now looking at placement using Laser on the 22. Going to get me/make me a lump of ballistics gel to see the terminal performance of the ammo I have! Just for piece of mind. Thanx to everyone for your input!

a couple of plastic milk bottles filled with water are much cheaper and will show you similar thing.....
the same comparison has been made with .30calibre subsonics of different weights...if 150s are already going through and through...going to 200grn gains nothing...the hole is still only the same size.

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Originally Posted by XR500

This thread really seems to be about solving a non issue. All centre fires that can legally throw a subsonic .22 cal pill are bolt or lever action. Throwing a pill that almost certainly won't expand like a pure lead hollowpoint 22LR sub will. If centrefire semis were still around, they would not cycle with subs.

A .22 semi will permit you to rapidly throw 10 x 42 grain lumps of beautifully expanding lead at whatever quarry you are after.

For a centre fire to be capable of throwing a useful size lump of lead at a pest, you need to be starting at 30 cal.

Only mtcw.

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Finishing rounds, or lower report (read virtually silent) for a niche use or on a specific property. There are reasons to make this interesting, one being the ban on rimfire and. 22 hornet on crown land.

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Originally Posted by BOBINNZ

I am trying to get my head around the reason for using fast burning powders for subsonic and not just lowering the normal powder.

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Reducing slower powders below the posted safe lower limit is dangerous, for two reasons:

One, the more powder available to be ignited by the primer flame the higher the pressure spike before the projectile leaves the muzzle. Slow powders are designed to be held against the base of the case for the powder burn timing to be as designed, which is basically a small surface area which acts as a delay for the burn of the powder column. If you put half the powder in and lay it along the bottom of the case the primer flame hits many, times the number of grains of powder which then all burn at once. It defeats the coatings on the powder designed to control the burn rate, and worst case is spiking the pressure high enough to pop a case or on certain actions even damage the breech. Fast powders all burn at once anyway, so aren't as sensitive to position in the case. The old skool way was to hold small amounts of slow powder against the bottom of the case with an inert filler that was just ejected from the rifle, but it's not an ideal solution.

Two, the powder granules can be ejected prior to being burnt and if they collect in the suppressor it can cause an overpressure of the can when they all decide to finally burn.