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Yes, I'm going to stick with AA1680 also. It's given me the most consistent velocities and has always cycled the rifle.
Still experimenting with loads. I tried the H110 with a little hotter load and got around 1150 fps... still wouldn't cycle the rifle reliably so its out as far as my rifle is concerned.
I started out at 50 yards zeroing the rifle in. With the AA1680 loads I put five shots all on top of each other, pretty much the same hole. Moved it out to 100 yards and the group opened up to about 2 inches... but I'm blaming that on myself (it was hot, I was tired, and the target was in a heavily shaded area so I couldn't see it very well). Going to try again in a few days.
KDiver, what barrel are you looking at going to?
How do you guys deal with the amount of drop the Whisper/Fireball has at sub-sonic speeds? With my .223 varmit rifle I can guess the distances close enough to put a round in a 'chuck's head up to 200 yards or so. Looks like with the .300 I'll need a range-finder... it drops 4.5 inches from 100 to 125 yards if you zero at 100.
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