Ballistics by the inch

Reprise: Converting a Glock 21 to .460 Rowland

Prompted by my friends over at the Liberal Gun Club, this is another in an occasional series of revisiting some of my old articles which had been published elsewhere over the years, perhaps lightly edited or updated with my current thoughts on the topic discussed. This is an article I wrote for Guns.com, and it originally ran 9/18/2012. Images used are from that original article. Some additional observations at the end.

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At the risk of seeming to be obsessed with the .460 Rowland cartridge, given that I have written about it three times this year, allow me to give a report on what it is actually like to convert a Generation 3 Glock 21 over to .460 Rowland using a conversion kit from 460Rowland.com.

One of my Ballistics By The Inch buddies had a Glock 21 9/11 Commemorative model, and was anxious to try the conversion kit. He ordered it in, got it in good time, and we got together to give it a try.

The process

First thing we did was field strip the Glock and check everything over. The gun has been shot, but not a lot. Everything with it looked fine.

We went ahead and set up a single chrono, just so we could get some numbers for comparison. This wasn’t the usual more formal BBTI set-up, but we figured it would suffice.

The 460 Rowland conversion kit up top, which includes barrel, buffer spring and compensator, and then the Glock 21 when converted.

Using the original .45 ACP hardware in the Glock, we shot some standard 230-grain ball ammo. It gave us readings in the expected range: about 780 fps. Then we ran some premium self-defense ammo, Cor-Bon 230 grain +P JHPs, and again got performance in the range expected: about 980 fps. Satisfied that the Glock was performing normally, we turned to the conversion kit.

The kit used came with just three items:

  1. A new five-inch barrel chambered for the .460 Rowland and with about a half inch of threading on the end
  2. A new captured recoil spring assembly
  3. A threaded compensator

The current kit shown on the site now also has a small packet of what looks like blue loc-tite and runs for $319 (now $387, more for a Gen 4).

The instructions indicate that you’re supposed to secure the compensator with loc-tite, so my buddy brought some along. This is probably why they now include a small packet of it with the kit.

If you’re familiar with Glocks, you know that field-stripping the gun is simplicity itself. We did so, and removed the original spring assembly and barrel.

Then we checked to make sure the new parts looked like they would fit. Everything seemed fine in comparison to the original parts. We installed the new barrel, then the new recoil spring assembly. Close examination seemed to indicate everything was where it needed to be.

We re-assembled the slide to the frame. Again, everything seemed to be fine. Manually cycling the gun, there was little or no noticeable difference.

We decided to go ahead and try the gun at that point, before mounting the compensator, just to get a feel for it. This is not recommended, but we wanted to be thorough in our test, as informal as it was.

The test

The .460 Rowland ammo we had was the same as we had tested previously for BBTI, and what started me on this kick: Cor-Bon 230 grain ‘Hunter’ JHP.

Initial shots were about 1170 fps. Just about what I expected. The recoil was stout, and there was some muzzle flip, but neither was particularly bad. We proceeded to mount the compensator that came with the kit. The compensator just screws onto the threaded portion of the extended barrel. You screw it down until it is almost to the front of the slide, with the compensation holes facing straight up. Then back it off a couple of turns, add some loc-tite, and reposition the compensator. Allow it to dry sufficiently.

Once it was ready (not completely cured, but sufficient for our needs), we loaded the gun again and ran it through its paces.

And we gained about 50 fps. Yeah, all the subsequent chronograph readings were 1220 to 1230. Nice.

Also nice was the way the compensator changed the character of the recoil: it was still stout, but there was significantly less muzzle flip. We all shot the gun through at least a full magazine (13 rounds) and agreed – it was faster and easier to re-acquire your target with the compensator, and the gun took less man-handling to control. The recoil was, as noted, still stout, and felt different than the slow push of shooting a .45 ACP out of the Glock. It was probably closer to shooting a 10mm.

The 460Rowland.com site touts a Nosler 185 grain JHP “carry ammo” and claims that it achieves 1550 fps. I haven’t tested it, but I’d believe it. And if so, you’re talking a whopping 987 foot-pounds of energy out of the thing. That puts it beyond the 10mm. Beyond the .41 Magnum. That puts you pretty solidly into .44 Magnum territory. Even the 230 grain round we tested has a respectable 766 foot-pounds of energy – compared to 526 for the same weight bullet out of a .45 ACP +P.

A little suggestion…

I said it before and I’ll repeat it here: if you carry a .45, you should instead be carrying a .460 Rowland.

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Oh, boy.

Time for a serving of Crow: I now seldom recommend that people make the full switch to .460 Rowland.

Why? As I said in a recent blog post:

As I have previously noted, I have now changed over to using the .45 Super cartridge rather than the .460 Rowland because the .45 Super offers most of the benefits of the .460 Rowland without some of the disadvantages. But I have kept the conversion kit in place because it gives me more flexibility in ammo selection and more control of the gun. And since I don’t carry the G21, the extra mass/length of the compensator doesn’t make a difference in day-to-day use.

So, yeah.

“Disadvantages” to the .460 Rowland? Well, I could never get my G21 to stop chewing up mags when shooting full-power .460 Rowland out of it. And the recoil could be … daunting, even for me (I’m not particularly recoil sensitive). I couldn’t ever share ammo with someone who had ‘just’ a .45 (the .460 case is slightly longer, and won’t chamber) — which is good (and intentional), because a lot of guns can’t handle the extra power of the .460 Rowland.

Now, the .460 Rowland definitely IS more powerful than the .45 Super out of handgun-length barrels. By a couple hundred foot-pounds of Muzzle Energy. That’s about the power difference of the .45 Super over the .45 ACP +P. But the .45 Super beats pretty much every other common handgun cartridge except the .460 Rowland and .44 Magnum.

You have to decide for yourself what trade-offs to make. But do so in an informed way. Look at the numbers. Try guns set up to shoot the different cartridges if at all possible — I often will stage my G21 to shoot three rounds each of .45 ACP, then .45 Super, then .460 Rowland so people can try the three rounds head-to-head. And usually they decide that .45 Super is more than sufficient.

 

Jim Downey

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November 5, 2017 Posted by | .357 Magnum, .41 Magnum, .44 Magnum, .45 ACP, .45 Super, .450 SMC, .460 Rowland, 10mm, Data, Discussion. | , , , , , , , , , , , , , , , , , , , | Leave a comment

Reprise: New Glock 21 Gen 4 .45 Review

Prompted by my friends over at the Liberal Gun Club, this is another in an occasional series of revisiting some of my old articles which had been published elsewhere over the years, perhaps lightly edited or updated with my current thoughts on the topic discussed. This is an article I wrote for Guns.com, and it originally ran 3/6/2012. Images used are from that original article. Some additional observations at the end.

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Glocks are like King Arthur’s Excalibur in reverse: where Excalibur could only be drawn by the true King, Glocks are intended to be handguns that fit just about everyone. The reasons to own a Glock far outweigh reasons not to own one. However, as the company introduces more models under the Glock Gen 4 moniker, this year it’s coming out with three (Glock 21, 32 and 34), it may pull in the stragglers…

Glocks aren’t for Everyone

“Did you see that? He picked up the Glock. He secretly wants to shoot it.” Jim said, pointing and smiling at me. “It’s OK. We know you really want to give it a try.”

“One of us! One of us!” chanted Keith, who stood beside him.

“Yeah, OK, I’m curious,” I said, turning the new Glock over in my hand, examining it.

Keith laughed. “Just giving you some crap.”

Glock 21 Gen 4 in .45 ACP.

The truth is, I was curious. I knew that Glock had changed a number of things about the gun with the introduction of the fourth Generation model (or Gen 4 as they call it), as with the rest of their line. I hadn’t gotten around to trying any of the new guns yet. But my friends knew my bias against Glocks.

Oh, I think Glock makes good guns. There’s little doubt of that in my mind. And they’ve had a profound effect on the modern firearms industry. But I just don’t like them.

To clarify, I don’t like shooting them. I’m just one of those people for whom the ergonomics of the Glock design doesn’t really work. It always feels like I’m holding a brick and trying to shoot it. They don’t point naturally, they don’t feel right in my hands, and I have a hard time hitting the broad side of a barn with one. A shame, really, since I do think that they’re good guns, incredibly reliable, and they’re reasonably priced with plenty of accessories available.

My friends knew this. But one of them had just gotten the new Glock 21 Gen 4, and wanted to give it a try. I wanted to see whether the modular back-strap system would change the feel of the gun at all in my hands.

Glock 21 Gen 4

Glock 21 Gen 4 has new dual spring design.

The Glock 21 is a full-sized .45 ACP pistol, generally considered to be a ‘duty’ gun. It holds 13 rounds, has a 4.6-inch barrel, a full-sized grip, and weighs 26 ounces. All around, it is a quality gun, though the emphasis is on function rather than looks. The sights are good, the trigger decent, and the fit and finish up to par. You know what you’re going to get from a Glock.

Keith (who is a Glock-certified armorer for his police department) took the gun from me, quickly disassembled it while giving me a run-down on the changes of the Gen 4 model: a more aggressive grip texturing, larger (and reversible) magazine release, and the aforementioned back-strap system.

But the biggie was the redesigned recoil spring assembly, which has an inner and an outer spring (captured together). He held it up, said “this makes it the softest shooting .45 I’ve ever tried.”

Quickly reassembling it, we loaded up magazines and gave it a try.

Shooting

How was it? Well, keep in mind that, as I said, I don’t care for Glocks generally.

I have large hands, bigger than either of my friends’. But counter-intuitively, the smallest profile back-strap was the one that felt the best to me. The ergonomics were much the same as the older Glocks I had tried, but for whatever reason it was easier for me to accommodate the shape of the grip with the lower profile back-strap.

And yeah, the recoil was mild. Very mild. Even though we shot first target ball ammo, and then full +P self-defense rounds, it felt like my mild practice reloads out of a full-sized 1911. Between the different grip and the recoil, it was easy for me to hit the target with my first shot and with subsequent follow-up shots.

Final Thoughts: In Glock We Trust?

After I went through a couple of magazines, I could tell that the ergonomics were still not quite right for my hand – the recoil did tend to focus on an odd place at the base of my thumb. But for the first time I could actually see myself owning one of these guns.

I’m going to have to give some of the other Gen 4 models a try, see if they offer the same (or similar) shooting experience. I don’t mind having to change my mind about me and Glocks. Don’t mind at all.

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Well, I *did* get a G21 Gen4, and did a .460 Rowland conversion on it (more on that next time). And since then I’ve also added a G30S (which is also a .45) to my collection. So clearly I’ve decided that the Gen 4 Glocks are indeed suitable for me.

As I said above: they’re good guns. I don’t consider myself to be a ‘Glock Fanboy’, but I don’t hesitate to recommend them to people … with the caveat that you should *always* try shooting a gun (on multiple occasions, if possible) before buying. Even with a Gen 4 Glock.

 

Jim Downey

November 5, 2017 Posted by | .45 ACP, .460 Rowland, Discussion. | , , , , , , , , , , , , , | Leave a comment