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12-20-2016, 01:04 PM
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Model 25-2 rechamber to 460 Rowland ?
Have any of you done this ? Clarks list it in their website, just wondering if anyone has done it.
I have fired the 460 Rowland in 1911's, and the recoil was pretty sharp, but the model 25's seem to tame down the 45 ACP loads, so I was thinking that the same would apply to a revolver conversion.
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12-20-2016, 01:34 PM
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Huh! I actually think that's a great idea, but as you say the 460 has substantial kick, more in my opinion than the 45ACP. I have a friend who does 1911 conversions to 460 Rowland. Listening to him it sounds to me as though the pressure increase is substantial.
I've been told that the model 25/625 cannot be converted to .44 Magnum because the metal has not been heat treated to withstand the increased pressure.
That might be worth investigating.
If you do it, I'll look forward to your report on it.
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12-20-2016, 01:42 PM
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Once the reciprocating weight of that slide popping back and forth is removed everything seems tamer. We have a 460 Roland here and it is not comfortable. However, when loaded in a Commander and carried for social purposes, it is comforting. We have gotten 1,200 fps with 200s.
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12-21-2016, 03:47 AM
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45 ACP max. is 18K CUP
45 ACP +P is 23K PSI (no CUP rating)
45 Super max. is ~ 28K CUP (=185gr JHP @ ~1350fps)
460 Roland max. is ~39K CUP
44 Magnum max. is 40K CUP
No, I haven't had it done. 45 Super run fine in my 325/625's though.
That's a sizable pressure difference between the two cartridges.
.
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12-21-2016, 10:15 AM
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I don't believe that a modern S&W model 25 is heat treated any different than a model 29. My hardness testing of several of each shows this and several have confirmed this with S&W. Plus, HT isn't magic and if your doing a HT it is no more difficult, time consuming or expensive to do the best if you have the equipment. This superior HT thing may have been true in the beginning of high pressure rounds.. It isn't now.
But, while I load my S&W 45 colts up into the 23-25000psi range of +P ammo, I would not load a 460 Roland case (about the same capacity as 45 Colt) to 39K and fire it in a re chambered model 25.
It would not surprise me that a model 25 cylinder could withstand the pressure, I just wouldn't bet one of my guns or body parts on it. The recoil of a such a round would be very similar to a 44 mag. Same weight bullet, same velocity, same weight gun = same recoil.
I really nead to built a test frame and see how much 2400 it takes to blow up a factory 45 colt cylinder. I have a large throat one and an old barrel in my pile. Just need to built a heavy test frame for them that I can remote fire.
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12-21-2016, 04:47 PM
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Re-chambering a Model 25 !!!!!!!!
hope your Mother doesn't find out what you are considering !
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12-22-2016, 01:12 AM
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My S&W 44 Mag revolvers have cylinder stop notches that run ~.040" thick vs. the ~.030" for for my 45 ACP & 45 Colt S&W's.
All else being equal (?) the 44 Mag cylinder has 33% more metal at the stop notch.
The 460 Roland case capacity (~29.0gr/H²O) is only slightly more:
- than a
45ACP & 45 Super (~27gr/H²O)
- vs. the
44 Mag (~38.0gr/H²O)
- or the
45 Colt (~42gr/H²O).
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Last edited by BLUEDOT37; 12-22-2016 at 01:16 AM.
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12-22-2016, 11:07 AM
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Just use 45Super with no changes to the pistol. The problem with the ACP in a modern revolver is the strength of the brass.
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12-22-2016, 07:09 PM
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I don't know. The 25/625 cylinders sure look thin to me,especially in the cylinder stop notches, to go to a seriously high pressure cartridge. But, appearances can be deceptive and perhaps all would be well with the much higher pressure cartridge. The converted 1911 pistols have a lot more steel around the cartridge. I'm aware there is an area of unsupported case head at the feed ramp in 1911 pistols. But, the brass is strongest at the case head, and unless a barrel is over throated, case head support has proven to be quite adequate for higher pressure cartridges in the 1911......ymmv
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12-23-2016, 01:40 AM
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Quote:
Originally Posted by Rock185
But, the brass is strongest at the case head, and unless a barrel is over throated, case head support has proven to be quite adequate for higher pressure cartridges in the 1911.
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When I started working up 45 Super loads in my, modified for, Colt 1911 using Starline 45 Super brass I found the stopping point when I noticed a bulge. The S&W 3rd Gens have better support than the 1911s though.
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Last edited by BLUEDOT37; 12-23-2016 at 01:41 AM.
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