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View Full Version : 10mm Alternative? "A Cheap Man's 10mm"


walmart_ar15
08-16-2012, 3:48 PM
Range update, loaded more rounds this time in a progressive loader and hit the range. Higher velocity deviation as expected, out of 25 shots chrono, avg was 1511 ft/s. ~ 910 ft.lbs. with max at 1572 and min at 1441. SDEV 36.7.

Up the spring to a 28#, cases drops about 1 foot to my 4 O'clock (probably too heavy). Accuracy seems fair. Hitting 15 out of 15 shots at 100yrd at a 12" plate with a ProPoint dot. Recoil felt like a 357 Mag.

Stat is in range of 44 magnum according to Sierra manual.

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This thread has nothing to do with which caliber is better, just like to share my personal experience in converting a 1911 into a 10mm caliber shooter.

After reading some of 10mm's ballistic performance, I really wanted to own something in 10mm, but did not want to invest too much into it since not sure if I would like the caliber (after all FBI dump it for 40S&W). After some net surfing, I came across two niche caliber, 40 Super and 400 Corbon. Both seems to offer 10mm performance, but the best part is I can convert one of my cheap RIA 1911 for very little cost. Unfortunately, 40 Super seems to fade out of the market (no conversion barrel available I can find), so I adopted to 400 Corbon, and hoping to gain the performance of at least 10mm or better.

There are down side going with 400 Corbon, factory ammo are expensive, and less mag capacity. Good thing I reload and KA does not give me hi cap option anyway.

Since I wanted to match 10mm performance (180 grn at 1350fps), I knew I could not just use standard 400 Corbon load and gun setup. So I went with a 26# recoil spring, shok-buff, 30# Main Spring, and square FPS. I also used a 6" barrel, slide extension, and used my old ProPoint attached to a full 6" rail. Idea is to slow down the slide speed with added spring tensions and slide weight.

For the 400 Corbon load I used Starline 45 Super brass neck down to 400 Corbon. Starline do sell 400 Corbon brass, but I wanted to make sure I used a higher pressure rated brass and besides 45 Super brass can be used in normal 45 ACP loads just in case it did not work out. I used Lee factory crimp die with heavy crimp to prevent bullet setback.

Load development was a long drawn out process (I have it in the Reloading and Ammo section). The gun is so tight, anything under 1200 fps will not reliably operate the slide. Long story short, the final load was 180grn at ~ 1470 fps!! That's roughly 864 ft.lbs!!. There is absolutely no pressure sign anywhere on the fired case. (I checked the dimensions case by case with a caliper while shooting). Comparably, that's more than 357 Mag and flirting with low end of 44 Mag. :43:

The load was based off 40 Super data, but the case dimension is 400 Corbon. So I guess it can be called 400 Super Corbon :p

So for those like me who reloads 45 and wanted occasional 10mm+ performance and didn't want to spend $$$ for a new gun, there are alternatives. :D

Haplo
08-16-2012, 5:57 PM
:useless:

walmart_ar15
08-17-2012, 2:42 PM
Crappy photo from my phone

http://img502.imageshack.us/img502/4628/20120817145941.jpg

Bhobbs
08-17-2012, 2:50 PM
FBI dumped the 10mm because smaller agents couldn't handle it, not because of a lack of performance.

Edit: I doubt those rounds would be much cheaper than 10mm if any.

walmart_ar15
08-17-2012, 4:17 PM
FBI dumped the 10mm because smaller agents couldn't handle it, not because of a lack of performance.

Edit: I doubt those rounds would be much cheaper than 10mm if any.

Yep, not sure I could handle it. :)

Actually, 400 Corbon cost more than 10mm for commercial loads. With reload, then my load will be slightly higher due to more expensive brass and more powder per round. However, if down load to standard 400 Corbon data, then cost is the same.

The saving is not in the ammo, but in the gun. Instead of buying a new 10mm pistol, one can convert an existing 45 with a barrel, recoil/main spring. I went over board since I was developing for max velocity not published, so I error on the safe side. Conversion cost depending on the barrel is between ~$80 to ~$200 compared to ~$550 for G20 or more for others.

But you're not going to be able to pick up a box of ammo from your local sporting goods store.;)

chrisf
08-17-2012, 4:30 PM
FBI dumped the 10mm because smaller agents couldn't handle it, not because of a lack of performance.

Edit: I doubt those rounds would be much cheaper than 10mm if any.
True. But .40 FTW (not trying to start a war here)

Corbin Dallas
08-17-2012, 10:07 PM
Where is the cheap part?

I bought a 10mm upper complete for my G21 for under 300 shipped.

Now I get to load my 10mm cases with the same 180g bullet I use for my 40s&w.

Where is the cost savings with 400corbon?

walmart_ar15
08-17-2012, 10:19 PM
I bought a 10mm upper complete for my G21 for under 300 shipped.



Would you kindly share where you purchased a complete 10mm Glock slide with barrel for under 300 shipped? :)

The 400 Corbon barrel I used was $56 and the springs were $14 for both recoil and main. With shipping ~ $80 total.

pyromensch
08-17-2012, 10:30 PM
FBI dumped the 10mm because smaller agents couldn't handle it, not because of a lack of performance.

Edit: I doubt those rounds would be much cheaper than 10mm if any.

did they "actually" dump it, or did they "download" it, which opened the door, to s&w, and winchester, to develop the 40 s&w

walmart_ar15
09-17-2012, 1:56 PM
Range update