gcf
.30 Stingray
South Texas
Posts: 272
|
Post by gcf on Mar 14, 2024 14:56:23 GMT -5
You may have to trim the cowboy brass a touch to fit an acp chamber It's gonna take some tweakin'... I've been trying a few different combinations with some bullets of the same type (but sized a bit smaller) that I got from Fermin: type of crimp, sizing, seating depth, & trim length. Dillon ACP sizing die backed off one half turn, untrimmed 0.896" , & a Redding auto-rim profile crimp actually chamber & headspace better then anything else tried. May need to go back to the drawing board - when my bullets show up. Biggest problem has been chamber wall clearance - but only where the brass is expanded by the .452" CB. Sized brass chambers fine / flush to rim otherwise.. Apologies to the OP for the hijack...
|
|
|
Post by revolvercranker on Mar 14, 2024 15:01:45 GMT -5
Marlin35 here is load data from Speer #9 for a Speer 250 gr swaged lead bullet SWC. HS6 7.4 grs to 7.8 grs Unique 5.6 grs to 6.2 grs Green Dot 4.6 grs to 5.2 grs Red Dot 4.6 grs to 5.0 grs Bullseye 3.8 grs to 4.1 grs
|
|
gcf
.30 Stingray
South Texas
Posts: 272
|
Post by gcf on Mar 14, 2024 15:04:37 GMT -5
My Lyman manual doesn’t show any data for 250gr bullets. In the auto rim section it only goes up to 230 and I believe it is the same for 45 auto. I’m sure there is data somewhere though for the auto rim. Check it out: www.handloadermagazine.com/45-auto-rim-p
|
|
|
Post by marlin35 on Mar 14, 2024 15:04:37 GMT -5
You may have to trim the cowboy brass a touch to fit an acp chamber It's gonna take some tweakin'... I've been trying a few different combinations with some bullets of the same type (but sized a bit smaller) that I got from Fermin: type of crimp, sizing, seating depth, & trim length. Dillon ACP sizing die backed off one half turn, untrimmed 0.896" , & a Redding auto-rim profile crimp actually chamber & headspace better then anything else tried. May need to go back to the drawing board - when my bullets show up. Biggest problem has been chamber wall clearance - but only where the brass is expanded by the .452" CB. Sized brass chambers fine / flush to rim otherwise.. Apologies to the OP for the hijack... Don’t apologize for hijacking. That’s when the threads get good and I learn something.
|
|
|
Post by patrick1948 on Mar 14, 2024 19:56:25 GMT -5
I do not think 45 Cowboy brass will fit in the 45 ACP cylinder.
|
|
|
Post by bobwright on Mar 15, 2024 9:17:14 GMT -5
I do not think 45 Cowboy brass will fit in the 45 ACP cylinder. I have heard that it did fit the ACP cyinder. Yet the only one I know who had the experience told me it would not fit his cyinder. a mite too long. When it was first introduced one of its stated advantages is that it would work in SASS revolvers with both .45 Colt cyinders, and .45 ACP cylindders. I have never bought any .45 Cowboy Special brass, but made my own by cutting down .45 Colt Brass. (This was salvaged brass that had neck splits and was destined for the scrap bucket.) Bob Wright
|
|
|
Post by bigbore5 on Mar 15, 2024 11:11:35 GMT -5
Like all Starline 45C brass it's made for .454" bullets. To use it in an acp chamber, it needs to be ran into a modern sizer die. I then trim it to acp oal and load it with super data for my Blackhawk acp cylinder.
I don't own any colts or replicas so don't know if they are good for acp pressures let alone super loads.
|
|
gcf
.30 Stingray
South Texas
Posts: 272
|
Post by gcf on Mar 15, 2024 16:50:21 GMT -5
Like all Starline 45C brass it's made for .454" bullets. To use it in an acp chamber, it needs to be ran into a modern sizer die. I then trim it to acp oal and load it with super data for my Blackhawk acp cylinder. I don't own any colts or replicas so don't know if they are good for acp pressures let alone super loads. Safe to assume you are loading cast bullets? If so, curious what OD CB's you are using? My cylinder throat's are a uniform .453" ID, & the dummy load bullets I've been using, are .4515". New order CB's should be .4525". If there's a problem with ACP sized SPL brass in Ruger ACP cylinders, to my mind, it's more to do with snug chamber dimensions, & running common 45 Colt dimensioned (.452" - .454") CB's. That, & the fact that a couple of chambers (not the throats) seem a bit snugger (guessing they could be lightly honed?) that the others. At least that's what I'm seeing initially. I should note that the ACP sized SPL brass drops rim flush into all chambers, with wiggle room. It's only when CB's get seated, that problems are noted. My Kart NM barreled Govt. Model Colt will accept .452" SWC loads - but they are pretty borderline snug chambering. It gets .451" jacketed or plated now. Same .452" loads drop happily into a factory Colt Commander chamber. My .453" GT order just showed up, & they look to be .4525" as expected, so we'll see how it goes.
|
|
|
Post by revolvercranker on Mar 15, 2024 17:02:40 GMT -5
Like all Starline 45C brass it's made for .454" bullets. To use it in an acp chamber, it needs to be ran into a modern sizer die. I then trim it to acp oal and load it with super data for my Blackhawk acp cylinder. I don't own any colts or replicas so don't know if they are good for acp pressures let alone super loads. Safe to assume you are loading cast bullets? If so, curious what OD CB's you are using? My cylinder throat's are a uniform .453" ID, & the dummy load bullets I've been using, are .4515". New order CB's should be .4525". If there's a problem with ACP sized SPL brass in Ruger ACP cylinders, to my mind, it's more to do with snug chamber dimensions, & running common 45 Colt dimensioned (.452" - .454") CB's. That, & the fact that a couple of chambers (not the throats) seem a bit snugger (guessing they could be lightly honed?) that the others. At least that's what I'm seeing initially. I should note that the ACP sized SPL brass drops rim flush into all chambers, with wiggle room. It's only when CB's get seated, that problems are noted. My Kart NM barreled Govt. Model Colt will accept .452" SWC loads - but they are pretty borderline snug chambering. It gets .451" jacketed or plated now. Same .452" loads drop happily into a factory Colt Commander chamber. My .453" GT order just showed up, & they look to be .4525" as expected, so we'll see how it goes. You are correct that Ruger 45acp cylinders are tight. When using cast with them doesn't matter if you have to push the cartridge in a little to seat it. Now I can see if you're loading a 1911 for protection you would want your cartridges to drop in the chamber. Also, as some say, a lawyer might not be too happy if you shoot someone with cast bullets or cartridges that you were known to have reloaded. So they say.
|
|
|
Post by wendigo on Mar 15, 2024 17:32:28 GMT -5
I've tried a number of the 45AR loads from the Pearce article in Cowboy Special brass, and recall that the accuracy winner for me was the Keith AR bullet with Universal.
FWIW I've had no issue using untrimmed Cowboy Special loads in the ACP cylinder of my 45 Bisley (44 frame), but the mid-frame Flattop .45 is a little too snug.
|
|
|
Post by bigbore5 on Mar 15, 2024 19:07:09 GMT -5
I've been trying a 235gr 452490 I turned the gas check step to plain base in. I size to .4525" to match the throats by Fermin. The chambers have been polished. It's definitely not a stock Ruger.
I've never really bothered with the acp type loads in a revolver before the last year or so. My dad was a 45C+p guy, but after discovering John Linebaugh's big bores, I didn't have alot of interest in anything in the middle. But I am getting older now, so the 4- specials are getting more interesting to my aging joints.
|
|
gcf
.30 Stingray
South Texas
Posts: 272
|
Post by gcf on Mar 16, 2024 11:08:55 GMT -5
I've been trying a 235gr 452490 I turned the gas check step to plain base in. I size to .4525" to match the throats by Fermin. The chambers have been polished. It's definitely not a stock Ruger. I've never really bothered with the acp type loads in a revolver before the last year or so. My dad was a 45C+p guy, but after discovering John Linebaugh's big bores, I didn't have alot of interest in anything in the middle. But I am getting older now, so the 4- specials are getting more interesting to my aging joints. I hear you on the aging joints thing. Getting older is tough, but beats hell out of the alternative… I’d be real interested in the details of your technique for polishing chambers - if you are willing to share.
|
|
|
Post by bigbore5 on Mar 16, 2024 13:13:32 GMT -5
Polishing chambers is simple. Bore hone sells chamber polishing hones specific to the chamber. I buy them from Brownells. Most are 400 to 800 grit.
Starting with the 400, I will use a touch of lubricant, mineral oil or tap magic. Insert the hone into the chamber and, using a cordless drill at a slow to medium speed, work the hone back and forth just until any machine marks are gone. Then do the same with the 800 until it's polished.
Very little is actually removed, it's just to polish it up. Going overboard is bad.
|
|
gcf
.30 Stingray
South Texas
Posts: 272
|
Post by gcf on Mar 16, 2024 13:53:30 GMT -5
Polishing chambers is simple. Bore hone sells chamber polishing hones specific to the chamber. I buy them from Brownells. Most are 400 to 800 grit. Starting with the 400, I will use a touch of lubricant, mineral oil or tap magic. Insert the hone into the chamber and, using a cordless drill at a slow to medium speed, work the hone back and forth just until any machine marks are gone. Then do the same with the 800 until it's polished. Very little is actually removed, it's just to polish it up. Going overboard is bad. Thanks - I’ll check it out!
|
|
|
Post by seminolewind on Mar 16, 2024 14:44:19 GMT -5
Polishing chambers is simple. Bore hone sells chamber polishing hones specific to the chamber. I buy them from Brownells. Most are 400 to 800 grit. Starting with the 400, I will use a touch of lubricant, mineral oil or tap magic. Insert the hone into the chamber and, using a cordless drill at a slow to medium speed, work the hone back and forth just until any machine marks are gone. Then do the same with the 800 until it's polished. Very little is actually removed, it's just to polish it up. Going overboard is bad. Do you run the hone into the throat or just in the chamber?
|
|