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Post by Encore64 on Jun 6, 2022 13:36:40 GMT -5
In 100% agreement with that. I find little to be gained pushing pressures to the max.
Have you measured the barrel gap on that cylinder?
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Post by reflex264 on Jun 7, 2022 7:23:39 GMT -5
.005" on the 460 and .004" on the .45 Colt.
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Post by Encore64 on Jun 7, 2022 8:11:04 GMT -5
.005" on the 460 and .004" on the .45 Colt. Bless you for providing information. Dang you for costing me money. LOL, THANKS!!! |
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Post by reflex264 on Jun 7, 2022 10:25:37 GMT -5
enabling makes the world go round.
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Post by Encore64 on Jun 7, 2022 11:25:26 GMT -5
enabling makes the world go round. I'm just curious what the 460 Rowland would do in a 5-Shot Custom? Inquiring minds want to know... |
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Post by bigbore5 on Jun 7, 2022 12:00:51 GMT -5
Out of curiosity I sectioned a Starline acp and a Super brass. They are not the same. The Super brass is thicker in the head and web areas.
The acp was from a batch I got about 5 years ago. The Super was from my last batch a year ago. Starline may have changed the acp since, but I haven't heard anything about a change.
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Post by reflex264 on Jun 7, 2022 12:17:51 GMT -5
Good to know. I doubt that they have changed it. I talked to Johnny Rowland years ago and he told me that the Rowland brass was much stronger than ACP brass. If we knew what the Starline 45 +P was like we could complete the set.
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Post by Encore64 on Jun 7, 2022 12:27:04 GMT -5
Good to know. I doubt that they have changed it. I talked to Johnny Rowland years ago and he told me that the Rowland brass was much stronger than ACP brass. If we knew what the Starline 45 +P was like we could complete the set. Did that yesterday. The web in the Starline 460 Rowland is .177" thick and Starline 45 ACP +P is .173" thick. Effectively the same... |
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Post by reflex264 on Jun 7, 2022 12:44:24 GMT -5
Just for the record the way I feel about it regardless what the pressure is with a few exceptions you reach a point of diminishing returns.
For instance in a .454 it pretty much takes top end loads to act like a .454 so that doesn't bother me in the least. In the case of the .460 Rowland in this revolver I specifically started out with a goal ballistically speaking. I wanted to see the 240 Sierra JHC at 1300 to 1350. When I found out they didn't have plans to produce any more of them I also adjusted my goal with the 240 Hornady XTP MAG but I adjusted it to reach the same performance level. Could I shoot the 40,000psi stuff in it? Sure but I reached my goal without going there so to my thinking more pressure in this case would have taken away my safety margin, made more noise and only netted about 125-150 fps. Knowing when to quit is as important as knowing when to start. I have seen loads in the .357 Magnum where adding that last grain of powder didn't add anymore velocity. Diminishing returns...........
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Post by Encore64 on Jun 7, 2022 12:52:20 GMT -5
I see little return over 30k in my revolvers. So, I have to agree.
But, would be interesting to see in this small(ish) cartridge.
Big cartridges like the 44 Mag, 45 Colt, 454 Casull, etc burn so much powder that you run out of barrel to burn it.
I've seen velocity actually drop as powder charge was increased.
But, I wonder if the same is true with a shorter cartridge? Powders like Longshot, CFE Pistol, Power Pistol, etc have made me rethink my certainty.
Like the 44 Special quietly creeps up on the 44 Magnum with far less flash, bang, recoil and powder charge.
Your research has been well thought out and makes me curious...
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Post by reflex264 on Jun 7, 2022 17:50:43 GMT -5
What I have seen is cartridges such as the .45 Super and .460 Rowland typically don't hit a flat spot like cartridges using slower burning powders such as 2400 or H110. Nearly all of my loads for these guns are loaded with powders such as Longshot, Power Pistol and Accurate 7 and with the heavier bullets Blue Dot. This is a deep subject. Volumes can be written about it.
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Post by bigbore5 on Jun 7, 2022 17:53:25 GMT -5
Been planning on a 5-shot Colt/acp convertible. Colt for heavy loads and the acp for plinking. Might have to add a few hundred more for a Rowland cylinder as a middle cartridge while I am at it. Seems like it'll be great with the lighter bullets and smaller charges. Plus there's the different than normal cool factor.
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Post by Encore64 on Jun 7, 2022 17:54:14 GMT -5
Once again, I agree. It's a subject I've never seen delved into.
That's what makes this one so interesting. It's not the same old thing repeated again...
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cmillard
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Posts: 1,997
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Post by cmillard on Jun 8, 2022 6:42:56 GMT -5
This makes me want to go check my 230xtp loads in my longslide .460. with my go to load of longshot, I thought I was over 1300 fps somewhere, but I could be wrong.
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Post by reflex264 on Jun 8, 2022 7:08:00 GMT -5
This makes me want to go check my 230xtp loads in my longslide .460. with my go to load of longshot, I thought I was over 1300 fps somewhere, but I could be wrong. 1300fps is completely reasonable in the Rowland autos and Without looking at the lower pressure data I think completely safe in the revolver. |
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