45 Auto Self-Defense Loads In a Springfield Armory Operator COA
Date: Sep 11 2026
a Picatinny rail for accessories and of course, the Aimpoint COA 3.5 MOA red dot optic.
the test, with the emphasis being on self-defense bullets.
When the Springfield Armory Operator COA announcement came across my desk, I was excited and immediately requested one. Having some ulterior motives (there was a Gunsite event that I was planning to attend) and being familiar with the Aimpoint COA and the 1911 made this a perfect gun for the Gunsite event. I have a bad astigmatism in my dominant eye; many red dot optics don't play well with my eyes. To date, the best ones I have used are the Trijicon RMR and variants and the Aimpoint ACRO and COA. This would give me a much better chance in the shoot-offs and friendly competition that would likely take place at Gunsite. While I waited for the gun to arrive, I began prepping brass for the 4 days of a social event interrupted by gunfire.
from old load notes, using 4.6 grains
of Alliant Bullseye powder and a
200-grain Oregon Trail SWC.
This was a common combination for
bullseye competition, and these
results show why.
Unfortunately, I already knew that by the time the handgun arrived, there wouldn't be much time to develop new loads and figure out exactly what this pistol would like. So, like any good reloader, I fell back on my meticulously kept notes, filed away in more three-ring binders than I care to admit. Between just the three on handguns, it makes Ken Waters Pet Loads look small; unfortunately, my binders are filled with as many, if not more, bad loads than good. Fortunately, after much rummaging around, I found a good standby load that has worked well in just about every 1911 I’ve tested: a good old-fashioned bullseye competition load that was passed down to me and probably 100 others via word of mouth. It was 4.6 grains of Alliant Bullseye with a 200-grain cast semiwadcutter. My preferred bullet brand for this particular load is Oregon Trail – every gun I’ve tried it in has functioned well and has printed some outstanding groups.
Shot powder and the 200-grain Sierra V-Crown JHP.
One issue with these bullets is that they are
relatively short; seating them straight can be a little
tricky when attempting to avoid overflaring the
case mouths. However, when done properly,
they are capable of impressive precision
and terminal performance.
As is typical with me, mere hours before the event, 10 rounds were quickly tested in the handgun to ensure function and establish a rough zero and a baseline for accuracy. With the gun hastily locked into a Ransom International Master Series rest, I fired a few fouling shots to get a rough zero and printed a 1.30-inch group at 25 yards with a mean radius of just .43 inches. That was exactly the confidence boost I needed, as I had already cranked out about 800 rounds on a Dillon Precision XL650.
Thanks to the quick test, my nerves about ammunition for the event were settled; all that was left was to show up. After four days and expending nearly all of my 45 Auto ammunition, I
best-performing powders overall
for precision, balancing accuracy,
speed and minimal velocity variation
across different charge weights.