I got really good accuracy with heavy for caliber 9mm bullets and light loads of Acc #7. I was experimenting with 9mm bullets cast and jacketed) up to 165 gr (maybe more but it was long ago) and the main problem I had was powder space for all but light loads and keeping a workable AOL. But when I got them to work they shot like a dream. (In case you are curious I couldn't get any expansion with an bullet at such low velocities and I would have had to cast my own soft bullets to get anything worthwhile. I don't think I will revisit that because it was a lot of trouble getting them to chamber, shoot and eject).