I've had equal accuracy with both types...the RN types from Missouri Bullets, sized .356" and the Lyman truncated cone #356402 sized .356. The guns were a Series 70 1911 in 9mm with Colt barrel, a Combat Commander in .38 Super and 9mm, a Glock with a Lone Wolf and Storm Lake replacement barrels, a Sig P226 Mk25, and another Sig P290, both in 9mm.
I've used a variety of powders from Bullseye on the fast side to Herco on the slow with about equal results. I've not done much with sizing, accepting .356" as a given. Of the guns above, the 1911 in 9mm has a custom barrel and bushing and the Sig P226 is a known accurate gun...in these two, playing around with sizing might make some difference, but the others are run of the mill in these calibers. I've slugged the barrels and found all were within .001" of .355"-.356"....none being considerably over size...a big factor in leading.
Accuracy runs between 2 and 3" at 25 yds from rest; not sterling but good enuf for defensive practice shooting, and much cheaper than jacketed bullets. I've had some leading issues with both types, but found that after normal sizing and lubing with 50-50 beeswax and alox, lightly lubing with Lee Liquid Alox clears up the problem and actually improves accuracy by 1/2" at 25 yds. It's my standard practice now, even with commercially produced bullets...and in other calibers as well.
HTH's Rod
