G30sf 10mm conversion?

[johnk518]

So, I got a bug to add to my G30sf and lately I've been in a few discussions about 10mm here on Calguns. So now I want to give it a go. I knew that Stormlake makes a 10mm barrel which is a drop in upgrade, sometimes requiring extractor work but that's the extent of it. Of course, I couldn't carry it, but I assume I could use it as a "bear gun" while hiking if necessary. Plus at $120 delivered it would probably be fun. Anyone here tried this and what did you think? Also there is a .460 Rowland kit but I see no need for that as much fun as it would be.

[onelonehorseman]

I hadn't heard of this, and have not considered adding that caliber to my collection as I have too many different calibers already, but I'm interested to see how it works for you once you have it.

Please give us a range report once you've had a chance to try it out.

[Henry Shooter]

Converted mine awhile back.
a wolf barrel and 10mm Glock mags total cost $185.
I didn't change the springs.
Shoots great.

[mnichols]

Do it.
10mm is much goodness.

[bmk20398]

I thought 180grain 45ACP+P is almost same as 180grain 10mm,
(but ammo is slim so G29 mag is shorter than G30 mag)
incorrect?

Western Loading Guide
45ACP+P 185gr Accurate No.7 12.6 1,170fps 5"
10mm 180gr Accurate No.7 10.7 1,183fps 5"

[johnk518]

I thought 180grain 45ACP+P is almost same as 180grain 10mm,
(but ammo is slim so G29 mag is shorter than G30 mag)
incorrect?

Western Loading Guide
45ACP+P 185gr Accurate No.7 12.6 1,170fps 5"
10mm 180gr Accurate No.7 10.7 1,183fps 5"

Any idea on the ft lbs? it could be only10 fps faster but a whole lot more of a wham at impact.

Apparently, it's a barrel and mag only conversion, I could file a nub on the extractor but that's determined after it's tried. I'm really only thinking about bear protection or cougar so one mag and box of ammo would be plenty in practicality.

[bmk20398]

Any idea on the ft lbs? it could be only10 fps faster but a whole lot more of a wham at impact.

Apparently, it's a barrel and mag only conversion, I could file a nub on the extractor but that's determined after it's tried. I'm really only thinking about bear protection or cougar so one mag and box of ammo would be plenty in practicality.

I found complete G29 upper on sale

https://www.gunbroker.com/item/798581775

==========

ft-lbs between 45ACP+P 185 vs 10mm 180 is also almost same,

Western Loading Guide
45ACP+P 185gr Accurate No.7 12.6 1,170fps 5" = 562ft-lbf
10mm 180gr Accurate No.7 10.7 1,183fps 5"= 559ft-lbf

For Muzzle Energy, we should go lighter bullet.
Hodgdon
10mm 135gr(Nosler JHP) CFE Pistol 10.2 1,551fps 5" = 721ft-lbf

But lighter bullet can not gain much more velocity than 40SW... headache.
Hodgdon
40SW 135gr(Nosler JHP) LongShot 11.5 1,434fps 4" = 617ft-lbf
Actual chronograph
40SW 135gr(Nosler JHP) LongShot 11.3 1,533fps 5" CZ TS40 = 705ft-lbf

[hermosabeach]

460 ear blast

So, I got a bug to add to my G30sf and lately I've been in a few discussions about 10mm here on Calguns. So now I want to give it a go. I knew that Stormlake makes a 10mm barrel which is a drop in upgrade, sometimes requiring extractor work but that's the extent of it. Of course, I couldn't carry it, but I assume I could use it as a "bear gun" while hiking if necessary. Plus at $120 delivered it would probably be fun. Anyone here tried this and what did you think? Also there is a .460 Rowland kit but I see no need for that as much fun as it would be.

.460 REQUIRES a muzzle brake.... or you will damage the frame/ break the gun.



.460 without hearing pro might be permanent hearing loss

[FullMetalJacket]

If your 10mm load has the same bullet weight and muzzle energy as your .45 ACP load, you're either (1) using a very high pressure .45, (2) using a very weak 10mm, or (3) both.

If you want bear defense in a 10mm, use something like this. 700 foot-pounds is well into .357 Magnum territory.

[robert101]

Yea, !0MM and 45 Automatic are not the same in ft-lbs. Handguns don't supply the energy of rifles but the 10MM is superior to the 45 Automatic. If you shoot both you know immediately.

[bmk20398]

If your 10mm load has the same bullet weight and muzzle energy as your .45 ACP load, you're either (1) using a very high pressure .45, (2) using a very weak 10mm, or (3) both.

Please consider about case capacity,
45ACP 1.73cc (11% more)
10mm 1.56cc
and 185grain for 45ACP eats less case capacity than 180grain 10mm (more mass outside brass) -> to keep 10mm in pressure spec, less powder usage than 45ACP+P.

I'm thinking deep about 10mm loads, because I just got Glock 40 MOS upper for my G41.
Now I can compare these guns
45ACP 5" : Glock 41 or 1911
10mm 6" : Glock 40
40SW 5" : CZ 75 Tactical Sport 40SW

How to get "really between 357 and 44" energy from G40...
So far I will try this recipe next weekend.
10mm 165grain, Accurate No.9 15.0
10mm 180grain, Accurate No.9 13.7

Actual 357 chronograph
357 XTP158 No.9 13.7, 6", 1,336fps = 626ft-lbf

Actual 45ACP+P chronograph
45ACP+P 185gr PowerPistol 10.2, 5", 1,234fps = 626ft-lbf
45ACP 185gr No.7 12.8, 5", 1,137fps = 531ft-lbf

If 10mm is really great -> I will add Glock 29
When 10mm is 5%-10% more than 45ACP+P -> I will add Glock 30, and if OP can convert 30 to 10mm, will buy same barrel

[johnk518]

.460 REQUIRES a muzzle brake.... or you will damage the frame/ break the gun.



.460 without hearing pro might be permanent hearing loss

Yeah, that's way more gun than I need. Besides the frame, probably my hand too

[SteveHamn]

I am in the exact same situation and have had simmilar thoughts. My understanding is that 10mm generally has more power than 45+P, maybe a weak 10mm is equivalent to a heavy 45+P. That said my main concern with a 10mm G30 barrel swap is how reliable will it really be? I'd rather have a underpowered 45+P that runs flawlessly than a 10mm that jams in the middle of a charge. Only way to really know is to do it and try it out at the range. Personally, I'd rather buy a G29 or G29 upper before filing anything, that seems like a good way to mess up your 45 reliability.

Another thing to consider is do you really really need a 10mm? If so why not just buy a G29, or a complete G29 upper, or a 44 Mag? Yeah you might save a few hundred bucks, but if you really truly need a 10mm shouldnt it be worth it? There's kinda a conundrum with this upgrade that is you really do need a bear gun you should just go buy one and not gamble with you life to save a little. The only situation that this makes sense to me is if you only really need a 10mm very rarely, once every few years, and the 10mm barrel works well enough then it would make sense. This kinda describes my situation and might be the same for you, so Ill probably give this upgrade a shot sometime in the future.

[Title1guy]

Though I've had my 10mm pistols in the past, I also felt comfortable carrying an XDs with Buffalo Bore 255g hardcast into the woods. My thought is that unless you will actually be in grizzly country alot, those should work fine with your current pistol. Though, I must admit it is fun to experiment.

[PennypackPete]

I Converted Mine

I converted my G30SF (G3) to 10 mm.

I used a Storm Lake conversion barrel, a G29 extractor, and of course 10mm mags.

I also used a stronger recoil spring (22 as opposed to stock 17 lb) because the cases were flying about 15 feet behind me.

Worked great and very accurate. I liked it so much, when I found a G29 (G3) on sale in gun genie and bought that.

I have found the G30 and G29 slides to be absolutely identical except for the markings. I've heard some theorize that the G29 has a heaver slide than the G30, but I found the weights to be identical.

I suspect that the conversion barrel was not necessary. I tried the G29 stock barrel in the converted G30 and it worked fine, with no adverse signs on the brass.

Its a fun conversion to do, and I learned a lot. I ended up putting the 22lb recoil spring in the G29. Its harder to move the slide, but the brass pile is much more manageable.
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