Cast bullet load development- .223
57 gr RNGC bullet 50/50 wheel weights/Linotype sized .224
WCC Mil-type case
Fed 100 small rifle primer
Winchester 748 powder
20 gr 1 ½ group
21 gr 1 ¼ group
22 gr 3 group
23 gr 4 group
24 gr Very erratic. Only one bullet on paper
24.5 gr Bullets vaporized upon leaving muzzle. Failed to reach target
All testing was done at 50 yards at an indoor range. All loads functioned well in AR-15 A-2 20 bbl.
As you can see I found a sweet spot at 21 grains of 748. Accuracy is pretty reasonable for a plinking load. After 18 test rounds there was no leading present in the barrel. For a bullet that is almost free, I am pretty satisfied with the results. I can load these for about $.10 each, $2.00 a box! The way ammo prices are going these days, $2.00 a box is a real steal.