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Post by bigbore5 on Nov 30, 2021 4:44:26 GMT -5
Is that cylinder a rechambered 45acp or a full custom?
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Fowler
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Post by Fowler on Nov 30, 2021 10:52:20 GMT -5
What sort of velocity will you get from that load? Congrats, I am envious 1377fps. I don't shoot full house auto data in this gun. 1377 is plenty and that data was under the 36,000PSI data I have. Some guys are using the 40,000PSI loads in these cylinders but that isn't enough safety margin to suit me. As soon as components loosen up I am going to do some pressure testing with the Rowland for use in the Ruger conversions. Okay I’m just going to ask why the caliber conversion to a cartridge that doesn’t surpass the heavy loaded 45 colt option that is already there in the other cylinder? Just curious if there is a reason beyond why not? That’s as valid as any reason believe me but I was just wondering. By the way I have almost the same gun in 45 colt converted to a Bisley, it is one of my absolute favorite guns. So I get loving that configuration of Blackhawk. |
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Post by bigbore5 on Nov 30, 2021 11:36:14 GMT -5
My pet 45 is basically the same gun too except I use the BB5 frame. It's at Chigs right now for Buckeye burl grips. Most used load is a 255gr rnfp at 1200.
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Post by 45MAN on Nov 30, 2021 13:10:19 GMT -5
My pet 45 is basically the same gun too except I use the BB5 frame. It's at Chigs right now for Buckeye burl grips. Most used load is a 255gr rnfp at 1200. ONE OF MY MOST USED LOADS IN 45 COLT RUGERS IS A COMMERCIALLY CAST, BB, 250gr RNFP @ AROUND 1,200fps. THE RNFP SEEMS TO BE AN ACCURATE BULLET AND PERFORMS WELL/KILLS GOOD DESPITE THE SMALLISH MEPLAT (I "THINK" THE PUMKIN LIKE ORGIVE MAKES UP FOR THE SMALLISH MEPLAT). I ALSO LIKE THAT BULLET IN S&W 45 COLT LOADS USING 9.0 - 9.5 grs OF UNIQUE. |
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Post by flyingzebra on Nov 30, 2021 22:10:37 GMT -5
240xtp from a 4-5/8" revolver at
1377fps, under 36,000PSI?
What is the OAL of the cartridge as loaded for your revolver?
What is the powder/load?
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Post by reflex264 on Dec 1, 2021 8:22:28 GMT -5
Is that cylinder a rechambered 45acp or a full custom? Rechambered .45 ACP. That is why I won't use the 40,000PSI data in it. It gets the velocity I was after without going to that level. Using the Rowland brass there isn't a chance of sticking a 30,000 to 35,000 PSI load in a 1911 ACP. I know there are guys using the Underwood and 460 Rowland factory loads in these cylinders. They say no problem. The cumulative effect of shooting 40,000PSI loads in a cylinder that wasn't made for it is enough for me to just say no. I achieved my end without going there. |
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Post by reflex264 on Dec 1, 2021 8:28:04 GMT -5
240xtp from a 4-5/8" revolver at 1377fps, under 36,000PSI? What is the OAL of the cartridge as loaded for your revolver? What is the powder/load? I will PM the Data. If you really want loading data that is all at or under 36,000 I have data for the 200 and 230 grain XTP as well. I am guessing you may just be curious because it sounds to good to be true. After component availability loosens up I will be doing my own work ups and pressure testing for the Ruger cylinders. Once I have hard copy in hand I will make it available to anyone that wants it. |
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Post by paul105 on Dec 1, 2021 9:25:37 GMT -5
I'd be interested in you load data. My 460 is a Clark Conversion on a 1911 frame.
Thanks,
Paul
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Post by flyingzebra on Dec 1, 2021 10:13:40 GMT -5
Have you put your loads from this revolver through a chronograph?
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Post by bushog on Dec 1, 2021 20:34:48 GMT -5
What’s a “BB5” frame?
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Post by bigbore5 on Dec 1, 2021 20:54:50 GMT -5
It's a frame I thought up. There's no frame that handles big recoil for me better than the BFR Bisleys Banana Grip. But it's not very stylish. The first design Ronnie calls the Biznana married the bfr Bisleys grip to the Blackhawk. Worked great and looks better than on the bfr. But I still wasn't satisfied. When Keith's #5 sold at auction Ronnie and myself were talking about it. I decided to redo the Biznana properly as to the looks. We took the backstrap up into a more conventional looking Bisley shape. The boss at the top is styled off the #5. The lower section keeps the biznana shape but is a slightly different angle. It is now a really nice style that handles huge recoil better than any other. There's photos posted in the brass grip thread of them both mounted on different barrel lengths and even a 357 max. |
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Post by starmetal47 on Dec 2, 2021 10:51:33 GMT -5
I suspect Ruger makes their centerfire cylinder of the same material and strength. They don't like their products blowing up. This is just an assumption, don't take it for a fact. With that said the 45 acp cylinder has a lot more "meat" around the cartridge simply because the diameter of the 45 acp (or 460 Rowland) is smaller then the 45 Colt case. I feel it should be stouter then the 45 Colt cylinder. Yes I know that the bolt lockup notch is an important factor on cylinder strength. Another thing if these 460 Rowlands can be fired in a 1911 and take it, wouldn't you think the Ruger is stronger then a 1911?
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Post by reflex264 on Dec 3, 2021 9:26:16 GMT -5
Have you put your loads from this revolver through a chronograph? Yes. I am going to get all of the data I have for all interested. Most of the loads under 36K don't get the velocities they got in testing but the gun they were tested in was a converted Glock so they were dealing with an unvented 5.5" barrel. The 240gr XTP mag bullet is getting slightly over the velocities. An interesting note on that bullet is Rowland started resizing that bullet for his factory ammo but they won't tell you what pressure they load them to. The older work ups using that bullet were all done with the bullet in its original .452" diameter. In my revolver the chamber mouths measure .4515" in the Clark modified cylinder. My bore is .452". I tried resizing the 240XTP mag using a push through sizer and finally got them to .4515" after 3 trips through the sizer. Accuracy was awful. The gun was shooting these bullets at .452" into ragged holes at a lasered 30 yards. The ideal bullet for the gun but I only had a few to try was the 240 Sierra #8820. It comes sized .4515". Velocity with the low pressure data was just over 1300fps which accomplishes my intended use for the gun. It was very accurate as well. That same bullet using 40K data runs nearly 1500fps from my Glock conversion. I will try to gather all this up this weekend. We will be hunting so it will depend on time available. As I already warned people on the earlier posts I wouldn't shoot the Rowland or Underwood factory ammo in this gun. That was never the purpose. Their ammo is 40K. I know guys are posting about using it with no problems on several forums but there is a cumulative effect of running 40K ammo in a cylinder that is made for 30K. If I want that level of power from the Rowland I will pick up the Glock. Truth be known I load it middle way between 45 Super and 460 Rowland and it kills just fine. |
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Post by reflex264 on Dec 3, 2021 9:29:20 GMT -5
I'd be interested in you load data. My 460 is a Clark Conversion on a 1911 frame. Thanks, Paul They do good work. When I inquired of them about the Blackhawk they said there was no problem running Rowland factory ammo in these cylinders. I just cant make myself do it. The cooler ammo kills deer just fine and won't beat up your gun. I will get it together in the next few days. |
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Post by starmetal47 on Dec 3, 2021 11:38:25 GMT -5
As a side note on velocity between a semi auto barrel and revolver barrel of the same caliber Allan Jones the ballistician done some tests on that and found in all the tests he done that the bullet had the higher velocity out of the revolver. I had always thought, as many others, that the cylinder gap lowered the velocity because of the vented gas.
I think that Ruger cylinder is rated higher then 30K. Will have to look for some old data I have.
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