The only difference I could tell between the .366 and .358 accubonds by filing down the bullets was that the .358 accubonds have a small airspace behind the white plastic plug. In the .366 version, there is no void or airspace...the lead goes all the way up to the white tip.
Jackets look similar in cross section. I'm presuming the difference in how the bullets expand is that void behind the tip.
The root of my problem was that the Nosler factory loaded 250 accubonds only got 2400 fps at the muzzle of my 9.3 24" Husky. If the bullets are started at 2700 fps, looks like they don't drop below 2000 fps until past 400 yards (sea level).
Bit academic in the end anyway...I also grab either a 30 cal or 7mm if I think I'll be shooting way out there.
