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Results are in from the ArmaLite.. success! Everything fed just fine from slow grouping shots to plinking off the last few. POI pretty much the same as factory Remington loads. Hornady's starting load was pretty soft though with H335 and 55 Gr. FMJ's. They cycled the action fine but it felt like shooting a hot rimfire LOL. I'm switching to Sierra's data, my hunting round with be using Sierra SP's anyway.
I also noticed that the jackets show rifling marks if I load them then eject without firing the round. I guess ArmaLite's 5.56 throat isn't all that long, My rifle is an M15 with the 16" midlength gas block 1:9 non LE barrel (no step down for "police" accessories), Chambered in 5.56 NATO, not Wylde. This is at a COAL of 2.200 (per Hornady's data). The new rounds are loaded at 2.250 per Sierra's book, with Sierra 55 grain SP's, I guess I'll take my calipers and check for setback too before I send them downrange.
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