RFI: .45 Auto Rim "Tier II" Loads
Quote:
Originally Posted by
okie john
The 45 Auto Rim is an interesting proposition in the 625. For one thing, you can get a 250-grain bullet going 1,000 fps and not have to worry about someone shooting that ammo in a 1911.
With 250-grain bullets in my 4” Model of 1989, I got the best results with a heavy roll crimp and 45 AR cases. Most 45 ACP dies will give you a roll crimp if you screw them down far enough, but that puts a massive taper crimp on the case first. That can screw up the driving band on a SWC, which opens up groups. The crimping shoulder in a 45 Colt die is too high for the AR case to reach, so I got a buddy to cut the bottom half-inch or so off of a spare 45 Colt crimp die. It looks kinda hillbilly, but it makes a proper roll crimp without the taper crimp and those loads were demonstrably more accurate in that gun.
John Taffin has published good cast-bullet load data for the 45 AR. There's also a cult of 625 owners on the S&W forum. Those guys have lots expertise in using heavy cast bullets in the 45 AR.
Okie John
I'm considering going this route with my 625 5" Model of 1989.
Anyone else have any experience with this flavor of heavy Auto Rim loads? I am all ears.
I currently have a Lee cheapo set-up, and a .45 ACP die set. H110 has been my standard powder for heavy .357 loads. Not looking to load in a lot of volume.
RFI: .45 Auto Rim "Tier II" Loads
You’ll want to get a roll crimp die for .45 amp/ar. Redding makes one: https://www.midwayusa.com/product/1012355584
H110 probably is too slow for this application. I’ve not tried it, but when I ran it through Quickload, the numbers were difficult to make work. It really depends on how high you want to go with pressure. Some of John Taffin’s loads seem pretty hot in Quickload, but reasonable if you set your pressure threshold to .45 super loads. Also, you can seat heavy bullets quite long in .45 ar, and I didn’t spend the time in Quickload to model this. I took a straight .45 ar cartridge data and tried some powder and bullet combos.
Start with John Taffin’s articles. Then look at .45 Super load data. Go from there. Seat the bullet as far out as possible.
Sent from my iPhone using Tapatalk