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Old October 7, 2018, 04:25 PM   #51
rock185
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Really interesting discussion generated from the OP's post you guys. I recall reading of that 9mm Mag. 115gr at 1475 FPS back in the day. No doubt easily achieved with the 9X23 Win. now days. Perhaps boutique loaders are already doing that? FWIW, I experimented a bit with Col. Cooper's "Super 9"/Super Cooper, using .223 cases trimmed to .900". In a 5" barrel, I got to 1625 FPS with a 115 JHP before deciding that discretion is the better part of valor, and not pushing my experiments further. Cooper's gun had a longer 6" barrel, and IIRC, experimenters using Cooper's personal pistol achieved results significantly surpassing mine.


COSteve, 165gr at 1589 FPS is impressive! That is a "fire breathing" 10mm load for sure. I don't recall achieving much more with 165/170 grain bullets than 1400 FPS or so in 5" semi-auto pistols. I had a S&W 610 revolver with 5" barrel that routinely produced higher velocities than my 5" semi-autos. Have to check some old chronograph notes, but doubt similar bullet weights in the revolver got anywhere near what your 6" gun produced.
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Old October 7, 2018, 05:11 PM   #52
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Cooper used a barrel that measured just under 6.5", and in the .223 cases approached 1750 fps with 125 grain bullets, and 2000 fps with 90 grain bullets.

Cooper, J. 1973. Debut of the “Super Cooper” 9mm Magnum. Guns and Ammo, December 1973, Vol. 17, #12, pp. 30-33.
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Old October 7, 2018, 05:35 PM   #53
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74A95, thanks for the info. I didn't remember the actual numbers, but your info is consistent with my recollection that others far exceeded my results with that longer barrel.
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Old October 7, 2018, 07:14 PM   #54
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This has been a very interesting thread--and has reminded me it has been a very long time since I fired my 9 x 25 Dillon, so I whipped up some cartridges and will see how it goes. The Glock 20 sf has never been a gun I could get a really good grip on; but it is powerful.

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Old October 7, 2018, 09:15 PM   #55
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Quote:
Originally Posted by 5whiskey View Post
At the end of the day, converting a 10mm pistol to 9x23 isn't super cheap and simple. There's a barrel change, mag swap (or modification), and for reliability i would want a slide dedicated.

FWIW 9x23 is capable of 357 mag ballistics with all bullet weights, in a pistol with roughly the same dimensional capacity as 9mm. Glock should partner with Winchester and be all over this. There would be a market for true, full 357 mag capabilities in a service sized high capacity semi-auto.


Yep


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Old October 8, 2018, 01:40 PM   #56
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Here are the results of some of the warmer Dillon loads above--though not my hottest. The TacTx's have a bucket-size hollow point, so they peel velocity off fast. I'm going to order some extreme penetrators out of curiousity.




The glock 20 is the perfect platform in terms of shooting the "big bangers"with aplomb--my ability to shoot it well unfortunately isn't what I wish it could be.
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Old October 11, 2018, 10:31 AM   #57
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Quote:
Originally Posted by rock185 View Post
Really interesting discussion generated from the OP's post you guys. I recall reading of that 9mm Mag. 115gr at 1475 FPS back in the day. No doubt easily achieved with the 9X23 Win. now days. Perhaps boutique loaders are already doing that? FWIW, I experimented a bit with Col. Cooper's "Super 9"/Super Cooper, using .223 cases trimmed to .900". In a 5" barrel, I got to 1625 FPS with a 115 JHP before deciding that discretion is the better part of valor, and not pushing my experiments further. Cooper's gun had a longer 6" barrel, and IIRC, experimenters using Cooper's personal pistol achieved results significantly surpassing mine.
COSteve, 165gr at 1589 FPS is impressive! That is a "fire breathing" 10mm load for sure. I don't recall achieving much more with 165/170 grain bullets than 1400 FPS or so in 5" semi-auto pistols. I had a S&W 610 revolver with 5" barrel that routinely produced higher velocities than my 5" semi-autos. Have to check some old chronograph notes, but doubt similar bullet weights in the revolver got anywhere near what your 6" gun produced.
The 'secret' is the 6" KKM target barrel vs a 4.6"-5" stock barrel. Power Pistol absolutely loves longer target barrels with a bit tighter chambers. As I said in other threads here, my neighbor's stock length G20, shooting my handloads, produced something around to 175+fps slower velocities than my custom G20L did. In addition, my G20L also produces less muzzle rise and a lower felt recoil (more of a push) because the extra 4¾oz of weight at the muzzle balances the pistol better, especially with the 17+1 rds on board ready for anything.

28% longer sight radius, better balance, smoother recoil control, less muzzle flip, faster recovery for second shots, and all in a package that's more compact, lighter, holds 3 times the capacity, and produces higher velocities with larger, heavier bullets than a 6" S&W 686. What's not to like about a 6" G40?
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Last edited by COSteve; October 11, 2018 at 10:37 AM.
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