Thread: 284 Winchester load data using AR2209

Greetings once again.
I had a fish around in the Hornady data for the .280 AI. This has a slightly larger case (around 6% larger) than the .284 and operates at the same or slightly higher pressure. Hodgdon lists 55.5 grains max of H4350 (AR2209) with the 140 grain Nosler Ballistic tip for 3,013 fps. The Nosler projectile is similar to the projectile you are using. It seems obvious to me that the .284 data is for the older and slower AR2209 and you should regard 55 grains of AR2209 as max for the 139 grain Interlock, much in line with the other posts.
Regards Grandpamac.