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I loaded them up but we are having ferocious winds over the last two days. 223 bullet at under 1100 fps, then not having the action noise seems to be desireable. If you want the ultimate in steath and you want it bad enough to shoot a. If you arn't all that concerned with noise you can just shoot supersonic ammo which is suppressed markedly with the can. But, on the other hand, if you are going to the trouble to shoot subsonic ammo you are trying to be as quiet as possible and having the action noise is defeating that purpose.
Subsonic 223 recipes 90 grain full#
On the one hand, obviously, it would be nice to be able to fire semi-automatically (or full auto if you have one). I have mixed feelings about having subsonic ammo that would produce enough gas to blow the bolt back on an AR15. These bullets however have a canalure (sp) and if you seat the bullet to the canalure, the OAL is short enough to feed through the magazine. They have to be individually loaded, which is no big deal since the 600 yard course of fire was slow fire. But, they are too long to be fed through the magazine. I have heard for years about NRA High Power shooters using 80 grain bullets for the 600 yardline. In other words, these 100 grain bullets are seated to magazine length. If you mean that they fire semi-automatically then no. Well, that depends on what you mean by cycle. The powder level in the case is almost as full as a standard load. up to where the case neck starts angling in. I am telling you right up front that I dont' know if these loads ARE safe in MY guns, let alone yours.įWIW, the case is filled approx. I sometimes read articles and posts that end with the warning that these loads are safe in their guns but they might NOT be safe in your guns. Use any of this information at your own risk. The only indication I have that this is safe is the fact that I fired them and nothing untoward happened.
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I am simply pouring powder in cases and seating bullets. I didn't stay at a Holiday Inn Express last night. This is just something I am making up as I go along. Let me state for the record that I have no idea if these loads are safe or not. So, this afternoon I will crank out a few and see how they run. That would be just about where I want to be. Based on my experience working with the 77 grain MKs I came up with the idea that a half grain of Trail Boss (in this cartridge) seems to result in about 140 fps. Firing this load through the suppressor seemed to be a non-issue and resulted in an average velocity of 942 fps. So, obviously the first five didn't keyhole and they grouped into about an inch at 50 yards off the bench. The other five were fired over a chronograph out of a 16" barreled AR15 with an AAC M4-2000 suppressor. I fired 5 of them at a distance of 50 yards, on paper, primarily to see if the bullets seemed to be stable: no keyholing and some kind of grouping. Note that I just pulled this number our of the air based on absolutely nothing. So, since I had absolutely nothing to go on, I decided to try loading the 100 grain bullets with 7.0 grains of Trail Boss and see what happened. This gave me a velocity with a 16" barreled AR15 just under the speed of sound (1072 fps) at whatever the elevation of Las Vegas is and at an ambiant temperature of between 105 and 110 degrees. With the 77 grain bullets I settled on a load of 5.8 grains of Trail Boss. But, as it turned out, this shouldn't be a big project. Finally, yesterday I started playing around with them in a very small way. So, I ordered a box of 1000 bullets several months ago which sat on my loading bench ever since. But, several people on this board mentiond 100 grain bullets, and even provided a link. I thought this was about the heavist bullet out there. In a previous thread I worked up a good subsonic load using the 77 grain Sierra Match King boat tailed hollow point. So, I have been playing around with loading fairly heavy bullets, subsonic. In the case of loading subsonic ammo, the velocity is fixed so it seems to make sense that increasing the weight of the bullet will make it somewhat more effective. At the very basic level, there are two ways to improve a cartridge's effectiveness: make the bullet go faster, or make the bullet heavier (both is nice also). 223 round to subsonic velocities reduces the effectiveness of the round markedly.