Thread: Resurgence of interest in the old "Three Oh"?

Greetings Micky, Jhon and Mimms,
I ran some test loads that included AR2206, AR2206H and others in my .308 last year. In every case AR2206 was faster than AR2206H. With the 125 grain Speer TNT AR2206 was almost as fast as BM8208. I used 47 grains of each and the velocities were BM8208 2,948 fps, AR2206 2,938 fps and AR2206H 2,902 fps. With the 150 grain Hornady Interlok and 44 grains of each powder gave AR2206 2,698 fps, AR2206H 2,674 fps, IMR 4064 2,656 fps and AR2208 2,564 fps. With the 165 grain Hornady Interlock and 43 grains of each powder gave AR2206 2,585 fps, A2206H 2,575 fps, IMR4064 2,443 fps and AR2208 2,424 fps. Cases were new Winchester for the 125 and 150 projectiles and CAC for the 165's. Clearly the loads for the slower powders can be increased for more velocity but the aim of the test was verify the relative powder speeds. ADI has some recent loads for AR2206 and the .223 and .308 but some of their other loads are ancient and probably not pressure tested. As an aside I fired a fouling shot with 45 grains of IMR4064 with the 150 grain in a Federal case. These cases are heavy and the load has been cut from my usual 46 grains. This load gave 2,755 fps. While all the other loads gave velocity close to that predicted from the data once charge and barrel length had been adjusted for this load gave 70 fps more, equivalent to about 1.5 grains more powder. I have test loads for both the .223 and .308 using different weight cases which I will report on once shot.
Regards Grandpamac.