Colt Python accuracy loads – The ExhaustNotes Blog

By Joe Berk

Man, I love my Colt Python. I thought I’d get that out of the way first in case anyone had any doubts. The Python is one of those things that just feels right. I’m glad I bought it and every time I take it to the range I feel good because I know I made a good decision.

I’ve been on a kick lately developing different loads for the Python with a focus on 158-grain and 180-grain jacketed bullets, and different propellants (including Winchester 296, Bullseye, IMR 4227, and Unique). Not to be combative and before you get your inner keyboard commando up, let me state at the outset that I can hear the comments already: What about 2400, or Power Pistol, or (fill in with your favorite powder). You go to war with the Army you have and I had to put a cap on the development work (and the above listed powders are what I had). If you want to see more development work with other powders, hit the donate button below and send me a note. Or start your own website.

158-grain DKC bullets, .357 Magnum reloads, and the Colt Python: A marriage made in Heaven.

I keep a stash of Hornady jacketed bullets as my preferred projectiles in the .357 Magnum, mostly because of their consistent quality and accuracy. Recently, I received an email from Raven Rocks for DKC 158-grain jacketed hollowpoint bullets, so I thought I’d try those. DKC is a Turkish bullet maker, and I know from prior defense industry experience that the Turks usually do a good job on armament components. You may recall that I recently tested some of DKC’s 147-grain 9mm bullets in three different handguns and I wasn’t too impressed with them (that blog is here). I wanted to see if the DKC .357 bullets were any better than the 9mm bullets (spoiler alert: they are).

For this testing, I fired all loads at 50 feet, I used my Garmin chronograph to measure the velocities, and I used my Lee classic four turret press and Lee’s .38/.357 four-die set for loading the ammo. I believe in Lee reloading gear, and when it comes to getting a good crimp on hot revolver cartridges, the Lee dies work best (you can read about that here). That’s especially critical on the Colt Python, which has a very short cylinder compared to some other sixguns). Making sure the other bullets in the cylinder don’t jump forward under recoil is critical with the Python (see our earlier testing).

So what’s the bottom line?

It’s 15.0 grains of IMR 4227, CCI 550 primers, and the DKC 158-grain jacketed hollowpoint bullet. Here’s how I got there:

I know the table’s font is too small to read as presented here. If you click on the table, a larger table will appear. You can thank me by clicking on the Donate button.

Oh yeah! A 50-foot target shot with the 15.0-grain IMR 4227 load. Point of aim was 6:00 on the orange bullseyes.

As stated above, I found that 15.0 grains of IMR 4227, a magnum primer (I used CCI 550 primers), and the DKC 158-grain bullet gave the smallest groups, but several of the other recipes were not too far behind. Just about any load combo worked well. But that 15.0-grain load…wow, it was a honey. The velocity (which averaged 1140 fps) was what I would consider moderate for a .357 Magnum. The recoil was correspondingly moderate.

Every gun is different, and it’s interesting to see what works best in different guns chambered for the same cartridge. The Unique load at the top of the table above was the accuracy load for my 6 1/2-inch blue steel Ruger Blackhawk. The 158-grain Hornady jacketed hollowpoint load with 16.7 grains of Winchester’s 296 worked best in my 6 1/2-inch Ruger stainless Blackhawk and it was stunningly accurate in my 8 3/8-inch Model 27 Smith and Wesson 40 years ago. But 16.7 grains of 296 makes for a religious experience type of load. Recoil is impressive and steady servings of those cartridges beat both the stainless Ruger Blackhawk and the Smith Model 27 to death. I only tried a few of those monster loads in the Python, and I’m glad they weren’t the accuracy winner.

I keep a stash of the .38 Special standard target load (2.7 grains of Bullseye with a 148-grain Hornady hollowbase wadcutter bullet) on hand. It is a one-hole load in my Model 52 Smith, and it’s been accurate in other .357 and .38 Special handguns. I wanted to use it in the Python as a standard of comparison, and it surprised me. It was the least accurate of any of the loads tested in my Python. Like I said above: Every gun is different.

After settling on the 15.0-grain IMR 4227 load, I wanted to see how it would do at 25 and 50 yards. I went to the West End Gun Club on a beautiful Sunday morning and set up targets at both distances.

I first shot at the 25-yard target and shot a great group, but it was high (it’s the group circled in red in the target below). The rear sight only had four more clicks left in the down direction, so I dialed those in and fired another five rounds. That produced the group circled in green in the target below. I used a 6:00 hold on the black bullseye for both groups.

A 25-yard target with my 15.0-grain IMR 4227 load. Two groups…one in red before lowering the rear sight, and one in green after lowering the green sight.

After firing the first 25-yard group, I shifted to the 50-yard target before adjusting the rear sight. That produced the group outlined in red in the target below. After lowering the rear sight, I shot the group outlined in green in the target below. It was a good group at 50 yards, but still too high (I was using the same 6:00 bullseye hold mentioned above). Because I was out of adjustment on the rear sight, I tried to hold about 4 inches below the bottom of the bullseye, and I shot the group outlined in yellow.

I couldn’t get the rear sight low enough at 50 yards, so I dialed in a little Kentucky droppage to get the group in yellow.

I’m pleased with these results. I might need to move the rear sight a scosh to the left, but I want to shoot a few more groups to confirm that. That will happen in the near term. I am also thinking about a taller front sight. The rear sight is already in its lowest position; a taller front sight would bring the point of impact in line with the point of aim. We’ll see.

What’s next? I’m thinking a trip to Arizona for some more pork. I’d like to see how this combo works on a pig, and I think there’s enough energy and accuracy to humanely take next year’s stash of bacon. Well, okay, you got me: I’m just kidding about the bacon part. There’s no belly fat on a wild pig. There’s plenty of other meat on one of those Arizona hogs, though, and I’m already thinking about a cookbook featuring recipes for the same.

Stay tuned.

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More gun stuff? You bet!

More Python? You bet. Here are our earlier Python related posts:

Python versus Blackhawk
110-Grain Python Load
Python TJ Trigger
Python Update
New Python Range Test
New Colt Python
A Colt Visit
Boudreau Bullets
A Pair of Prancing Ponies

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I’ve owned three Colt Pythons. Back in the ‘70s I had a blue 6-inch Colt Python and another 6-inch nickel-plated one (they were only about $250 back then, and I could buy them for even less through the Post Exchange). Both those Pythons went down the road, and yeah, I’m sorry I sold them. Who wouldn’t be?

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These days, I have a 6-inch bright stainless Colt Python, the new model, and I love it. It’s the one you see in the photo above. I’ve been to the Colt factory to see how they are made, and both the Python’s design and its production are impressive. I’ll let you in on a secret: The new Pythons are better guns. I shoot my Python a lot. In the last few months I’ve been hitting the range with it at least a couple of times every week. I’m old school, I guess: I prefer a revolver to a semi-auto, and I prefer .38 Special and .357 Magnum over 9mm. Your mileage may vary. I know what I like.

Winchster 110-grain jacketed hollow point bullets waiting to be seated and crimped.

I remembered that back in the day I found a 110-gr jacketed hollow point bullet with 10.0 grains of Unique (the max load in the Hornady manual in the 1970s) and it was extremely accurate in my blue steel Python. I mean, like one-hole accurate. Accurate enough to keep that load in my memory for five decades.

Fast forward 50 years and you’ll find me scrounging for reloading components on a fairly regular basis. On one of those scrounging expeditions Rick Phillips (of Phillips Wholesale) had Accurate No. 5 propellant in stock. It’s a handgun powder, and Rick told me that Accurate No. 5 has a burn rate about like Unique. Hmmm. Unique, huh? That stuck in my mind, mostly because I had some 110-grain .357 pistol bullets in my components stash: I had Winchester jacketed hollow points, and Hornady jacketed hollow points. I bought a bunch of the Winchester bullets during the Obama years when everything was scarce, and I was down to one unopened bag of 100. I had an unopened box of the Hornady 110-grain bullets, too.

Winchester, if you’re paying attention, this bag was 15 bullets light.

I loaded the last of the Winchester bullets recently using some junk 357 brass. I have Unique, but I wanted to see if I could get good results with Accurate No. 5. Rick’s comment about Accurate No. 5 being about like Unique stuck in my mind. The max load on the Accurate site for 110 grain bullets is 11 grains, so I loaded some at 10.1 grains and some at 10.5 grains, both with magnum CCI primers.

Winchester shorted me on that last bag of 100 grain bullets. The last bag I had was unopened, but it had only 85 bullets in it. I wrote to Winchester customer support, and they responded with an answer that was left blank. I wrote to Winchester again after receiving the above non-answer for an answer, but I’m not holding my breath.

The results with both the Hornady and Winchester bullets were great. Here’s a 5-shot group at 50 feet with 10.1 grains of Accurate No. 5 and the Winchester bullets. This was the best group this morning, but they were all good.

That’s how we like to do it. I know the brass is dirty. This was a quick and dirty test. The laod was 10.1 grains of Accurate No. 5, a CCI 550 primer, and Winchester’s 110-grain jacketed hollowpoint bullet. The distance was 50 feet.

The 10.1 and the 10.5 grains of Accurate No. 5 loads shot about the same from an accuracy perspective, but the 10.5 grain loads made the primers flatter, so I’ll load the 10.1 grain load the next time I reload this ammo. No sense burning up more powder and stressing the gun and the brass if there’s no accuracy improvement. It’s already excellent at 10.1 grains.

Rugged, reliable, regal, and rewarding: Today’s Colt Python.

The Winchester bullets looked cruder than the Hornady bullets but I think they maybe had a slight accuracy edge. I went online to buy more, but I learned Winchester discontinued them. One of my buddies had two bags and he gave them to me, but the odds of me ever getting any more are slim. Hornady, Speer, and Sierra all make JHP 110-grain bullets, but nobody has any in stock. I have 85 left of the Hornady bullets (I used 15 of the Hornady bullets to make up for the ones Winchester shorted me) and now, an additional 200 Winchester bullets. You still owe me 15 bullets, Oliver.

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