H, are you getting more velocity, with these bullet weights, out of H335, than AA2200?
H335 is old ball technology and the AA220 ( as you well know) is the newer double based spherical version that should give higher velocity at same case fill %. I just assumed that H335 couldn't beat any of the St. Marks' powders.
Did you try them head to head?
Even with the bullet seated out to bolt gun OAL, I got up to 28.5 grains of AA2200, and never got any higher than 2634 FPS.
Once I got past 28 grains, the velocity stopped increasing, and I started to see primer flattening at 28.5. My bolt gun barrel is 18".
I've never seen anyone hit 2700 with the 120 SST. I'm pretty sure your chrono was giving you erroneous readings.
AA2200 seems to be the most efficient in longer barrels. Here are three more of my 120 gr. SST loads with 2200. I tried 28.2 gr. and it was too hot and accuracy was erratic.
Last edited by JerBear; 03-08-2012 at 06:22 PM.
I believe Wassman is shooting a Stag 7 with a 20.77 inch barrel and gaining 36 fps per inch of extra barrel. That is the shiz right there.
Shot a box of factory loads today. Hit where they should every time.