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The only loads I've done are sub-sonic. I've used Sierra 220 and 240 mks and Hornady 208 A-max. I did pick up some Speer 130gr HP's that I plan to develop a load for soon for varmints.
Heavier bullets do better with sub-sonic loads on big game.
123 grains x 1000 fps = 273 ft. lbs.
208 grains x 1000 fps = 462 ft. lbs.
You could, of course load that 123 SST to 2200 fps and have a real sweet bullet for big game with more range but it wouldn't be subsonic of course. Post up what kind of trajectory you get though I've always wanted to know from someone firsthand about that kind of set up.
I shoot it in a 10.5" AR upper that I built through a 7.62SD and in a 16" rebarreled Axis Savage with the same can. So far I have been shooting 208 A-maxes. I have some 125 gamekings to try later. The 208 amaxs are impossible to get right now so the 125's are on next on my load list. So far I have only loaded the blackout subsonic. The 125 gamekings are supposed to be great on deer and hogs we will find out. Next challenge is to find a cheap bullet for the blackout that I can use for fun/plinking.
I just ordered a reasonably priced .300 Blackout upper receiver on Saturday (two days ago) from Model 1 Sales. Received an automated email response today that "my order has been processed and will be shipped in approximately six weeks". Will see how that goes.
Any problem with making .300 Blackout out of shortened and resized .223 brass?
I've made 300 whisper/blackout brass from .223 before. Just trim below the neck and resize. I trimmed with a tiny tubing cutter I picked up at Lowes but there are other methods. I was cheap, the cutter cost only a few bucks. Haven't seen any problems with neck tension of any sort in either my AR or my bolt gun.
But a word of caution, making the brass took a long time to cut. I'm glad I did it but next time I'm just buying brass on line or from someone. There are people on the firearms forums making some from Lake City brass for good prices, especially if you value your time.
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