9mm Accuracy Loads – The ExhaustNotes Blog

Back in January I tested a bunch of 9mm cast bullet loads in the three handguns you see above: A SIG P226 Scorpion, a Smith and Wesson Model 659, and the Springfield Armory 1911 Target. For that test series (you can read it here), all the loads used the Missouri 125-grain cast roundnose bullet with different powders and different charge weights. My cast bullet testing showed the SIG to be the most accurate, followed by the Springfield and then the Smith and Wesson Model 659.

I promised an update with jacketed bullets to assess accuracy and functionality of all three handguns (and to find favored accuracy loads for each). It took a while, but I finally got around to making good on that promise this past week. The six different loads I tested for the jacketed 9mm test series are summarized below:

Actually, the term “jacketed” doesn’t really apply to the Xtreme bullets (they are copper plated, not copper jacketed). The Armscor bullets are brass jacketed. Both the Winchester and Speer bullets are copper jacketed bullets. As you can see from the table above and the photos below, the Xtreme, Armscor, and Winchester bullets were of the roundnose configuration. The Speer 147-grain bullets were jacketed flatnosed bullets. I didn’t try any hollow points in this test series; I prefer roundnose bullets in my 9mm handguns. They are reliable.

All groups were 5 shot groups. I shot a total of 360 rounds in the two test series (both the jacketed and cast bullet accuracy tests).

While I was shooting last week, I was a little disappointed. I thought I had done a lot better with the cast bullets back in January. I thought my jacketed groups were larger when I eyeballed the targets, but you never really know until you measure the groups.

9mm jacketed bullets on an Alco target. I like using the Alco target that has four mini-silhouettes on a single target. All testing was at 50 feet.

When I returned home, measured the group sizes, and tabulated the results, I was surprised. The results of the jacketed and plated bullets were not too different from what I had achieved with the cast bullets almost a year ago. Take a look:

The most surprising finding, for me, was that the average results with the jacketed bullets (versus the cast bullets) were almost identical. Here’s that data extracted from the above, shown in a table that makes it a little easier to make the comparison:

My testing showed essentially the same results for the three handguns I tested whether I used cast bullets or jacketed bullets: The SIG P226 Scorpion is the most accurate (it is a magnificent handgun), followed by the Springfield Armory 1911, followed by the Smith and Wesson 659. It doesn’t matter whether it’s with cast or jacketed bullets: The averages are eerily similar for each gun, with a very slight accuracy advantage going to the cast bullets for the SIG and the 1911, and a very slight accuracy advantage going to the jacketed bullets for the Smith 659. But the differences between jacketed and cast bullets are so small they can be ignored. Cast bullets are usually a lot less expensive than jacketed bullets, so this is good knowledge.

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I’ve been lusting over the SIG P226 Scorpion for some time now, and after a little bit of brushing up on my negotiation tactics, I pulled the trigger (figuratively speaking) on one this morning.

I like the looks of the SIG, I like that it is an alloy-framed handgun (I’m not a big fan of the plastic guns), and I like that it is a SIG. Good buddy TJ told me he believes these are the finest handguns available today, and he’s a guy who knows handguns. The US Army recently made their sidearm decision and it’s SIG. That’s a strong endorsement, I think.

I bought my SIG Scorpion at Turner’s, the gun will be in the store this Thursday, and that’s when I get to start the PRK (Peoples Republik of Kalifornia) 10-day waiting period.

My tried and trusty Model 59, the gun that got me hooked on 5.0 grains of Unique and a 125-grain cast roundnose bullet.

I’ve got a boatload of 9mm ammunition reloaded and ready to go, but that got me to thinking: What load might work best in the new SIG? I’d found in the past that 5.0 grains of Unique and a 125-grain cast roundnose bullet provided great accuracy in my Model 59, but then I got lazy and I stuck with that as my standard 9mm load in everything. I’ll be the first guy to tell you that to find the best load in any gun, you need to experiment and develop a load specifically for that gun. I have a couple of other 9mm pistols (a Springfield Armory 1911 and the Model 659 Smith and Wesson that I’ve blogged about before), and I’ve simply used my 5.0-grain Unique/125-grain cast roundnose in all of them. Is there a better load for each of these handguns?

The 659 with my 125 grain cast roundnose reloads.

The Springfield 9mm 1911. It seems to like the 5.0 grain Unique/125-grain roundnose load, too.

So here’s what’s coming up: I’m going to do a load development comparo for the 659, the 1911, and the P226 to see where the accuracy lives for each gun. I’m thinking Unique, Bullseye, Power Pistol, the 147 grain Speer, the 125 gr cast RN Missouri, and maybe a 115 full metal jacket or hollowpoint bullet. I’m looking for inputs, so if you have a favored load for your 9mm handgun, let me know and I may throw it into the mix, too. Please add your suggestions to the Comments section here. I’ll keep you posted.

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