quote:Originally posted by ricciardelli: It would help if you told us the cartridge caliber...
Of course, I guess that would help. Sorry about that!
I am loading 5.56mm in Lake City brass with Win. small rifle primer.
I went to the range today to test some of the loads. I had found one site that suggested that the maximum load for 2230C powder with a 60gr bullet would be 25.0 grains and would deliver 2950fps.
At 24.9 grains, I was only getting 2740fps. The day was in the low 90s, which I have heard can create more pressure and faster loads.
I checked the AA powder book,the one you get when you buy their powder, but it doesn't even list a load for the bullet or the powder. It does list 2230, but I understand that 2230C is a little slower.
I am shooting a Rock River M4 carbine. I wonder how much velocity I am losing by having a 16" barrell and not a 20" barrel. Also, the Chrony was set up about 12 feet in front of the muzzle.
One other thing. I hand weighed each charge on a digital scale to the exact charge weight. I am using the same run of brass and bullets which weigh exactly 60gr. I would get a good close velocity string, with a spread of 10-15 fps, and then one would come out with a 100-140fps spread. The only thing I can think of is that the primers are causing the varation. I would greatly appreciate any insight you would care to give me. Thanks. EV
2230C is a surplus powder and can demonstrate wide variations in burn rates vs most standard grade powders, this is one area where starting and working up is absolutely neccessary. I think that stubby barrel is the culprit for your low velocities.
Posts: 1554 | Location: NC | Registered: 10 June 2002