762 shooter
01-18-2015, 11:07 AM
I am playing around with the 311413 cast "Squibb" boolit in my 300 BLK. 16" CMMG, 1-7, carbine gas AR rifle.
I loaded some with IMR 4227 in the neighborhood of 1750 fps before I did a good search here and was shooting patterns at 50 yds. I now know that this mold is probably suited for 1600 and below for decent accuracy.
I am going to try some IMR 4198 to get some slower speeds. A full non compressed charge is 14.0 grains with this boolit and by using advanced logic, intuitive reasoning, and interpolation, should have me in the 1450ish range.;)
My question is about the definition of "light loads" and the possibility of detonation. This should be safe if the powder is to the base of a certain boolit and I am well below the max safe loading? I understand that it may not function my AR action, but I am just looking to make this cast boolit accurate. My understanding is that light loads are based on airspace.
I'm thinking I'm OK, just wanted to see if anyone had a comment about my brain function.
762
I loaded some with IMR 4227 in the neighborhood of 1750 fps before I did a good search here and was shooting patterns at 50 yds. I now know that this mold is probably suited for 1600 and below for decent accuracy.
I am going to try some IMR 4198 to get some slower speeds. A full non compressed charge is 14.0 grains with this boolit and by using advanced logic, intuitive reasoning, and interpolation, should have me in the 1450ish range.;)
My question is about the definition of "light loads" and the possibility of detonation. This should be safe if the powder is to the base of a certain boolit and I am well below the max safe loading? I understand that it may not function my AR action, but I am just looking to make this cast boolit accurate. My understanding is that light loads are based on airspace.
I'm thinking I'm OK, just wanted to see if anyone had a comment about my brain function.
762