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Discussion Starter · #1 ·
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
OAL 2.42”

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.
 

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I wouldn't be shooting to many of them in my 223. You are going to get some serious leading unless you keep the speeds down real low which in my mind totaly defetes the pourpose of having a HIGH velocity VARMINT cartridge.
 

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I have been casting for rifle and pistol cartridges for about 25 years and have learned a thing or three about what works. Using a very hard alloy is the first step. A gas check prevents most of the leading issues. Many folks do not realize the leading does not generally come from the sides of the bullet. The leading comes from the burning gun powder melting the base of the bullet. The gas check pevents this by keeling the hot gasses from contactin the base of the bullet.

Generally 2100 to 2200 fps is the workable max velocity for a gas check hard cast bullet. The purpose of the experiment was not to find a high velocity varming round or anti-personnel round. My purpose was to see if a low cost alternative plinking round could be developed. I believe I have succeeded in that aspect.

Leading is not a problem at these levels using this type of bullet. A lot of folks think of swaged .38 spl bullets that will lead the heck ot of a revolver. Cast bullets (especially w/a gas check) are a completely different animal.
 
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