I have been sifting through tons of threads about different alloys and their uses, as well as the threads specific for the caliber that I am interested in. So much information spread over several years all with mixed results and most with incomplete information. There are quite a few of you out there that have had success with shooting cast 223 boolits in your AR platform rifles, some at high velocity. The latter is what I'm looking for information on. I have tinkered with the lee C225-55 boolits and have shot acceptable for me groups @3" at 100 yds on the low velocity spectrum (2100 fps). I would like to push the velocity up to bring the trajectory closer to jacketed loads. I currently use straight COWW with a touch of tin, nothing scientific no weighing involved. More than willing to start approaching the alloy from a more precise direction. Have been contemplating what alloy would work best to put me on the right track for success.
I have been using copper gas checks, conventional lube (currently carnuba blue), water dropped COWW, and weight sorting to tenth of a grain. All this with the Lee C225-55rf mold. I have recently purchased the NOE 225-70 mold with the hopes the heavier boolit will work in my 1:8 twist carbine barrel a little more efficiently than the lighter 55 gn boolit. I want to push these a little faster, not talking 3000fps just more like 2700fps. Thinking that at this point the actual alloy is probably what will hold me back.
Really is no question in this post, just wanting to start a discussion about what alloy would be best suited for this specific caliber/rifle combination.