|
|
Post by leftysixgun on Jun 23, 2019 12:09:01 GMT -5
Bradshaw, I have some curiosity questions about primers and the max. Ive read data and you have suggested to use rifle primers due to the higher pressures to prevent blanking/blowing the regular small pistol primers. The rifle primers having a thicker cup prevents the issues. Im assuming I have the reason correct. Thats fine Im not here to challenge that part. But, since the 475 Linebaugh and even the 480 Ruger have higher operating pressure similar or higher than the 357 max.....why arent we using rifle primers in the two 475 cartridges.
Educate me please.
|
|
|
|
Post by leftysixgun on Jun 23, 2019 12:11:34 GMT -5
You have also mentioned the use of the heavier hammer/main spring coming from the Ruger Old Army (I think I have that correct).....what weight is this spring? Once my max arrives Id like to order a few extra parts to keep on hand. This main spring being one of them.
|
|
|
|
Post by leftysixgun on Jun 23, 2019 17:38:45 GMT -5
Finally found and picked up some IMR 4227 today. The kernels look real similar to Power Pistol.
|
|
|
|
Post by bradshaw on Jun 23, 2019 21:01:00 GMT -5
You have also mentioned the use of the heavier hammer/main spring coming from the Ruger Old Army (I think I have that correct).....what weight is this spring? Once my max arrives Id like to order a few extra parts to keep on hand. This main spring being one of them. ***** During development of the .357 Maximum, we experienced PRIMER BLANKING with Prototype Blackhawk Maximums. Major causes of blanking* high pressure. * weak mainspring. * oversize firing pin hole----not relevant to this discussion. * primer too weak for chamber pressure. The change to rifle primers was immediate. Small rifle primers did not stop blanking altogether with the Blackhawk mainspring. Bill Ruger, Jr., tried the cap & ball Ruger Old Army mainspring, which has a heavier coil. The combination of rifle primers and the Old Army mainspring ended blanking and restored consistent ignition. Remington didi its testing from machine rest, remotely fired. We shot the same ammo, hand held in the SRM prototype revolvers, behind the New Hampshire houses of Bill and Bill Ruger, Jr. I do not know the “weight” of various mainsprings. While I cannot speak for pressures of the Linebaugh cartridges, nor the .480 Ruger, I’m not sure you want to hand-hold 80,000 psi in revolvers so chambered. David Bradshaw |
|
|
|
Post by leftysixgun on Jun 23, 2019 21:33:43 GMT -5
So what is the weight of the mainspring in a Blackhawk Maximum?
|
|
|
|
Post by bradshaw on Jun 24, 2019 6:45:29 GMT -5
So what is the weight of the mainspring in a Blackhawk Maximum? ***** Don’t know “weight” of various mainsprings. Read my explanation of BLANKING. David Bradshaw |
|
|
|
Post by seminolewind on Jun 24, 2019 7:07:16 GMT -5
Brownells says the Ruger OA mainspring is 23#. As Mr. Bradshaw says, the Maximum uses an OA mainspring, so 23# should be right.
|
|
|
|
Post by leftysixgun on Jun 24, 2019 8:30:32 GMT -5
Thanks
|
|
|
|
Post by bradshaw on Jun 24, 2019 10:39:09 GMT -5
leftysixgun..... page 5 of this report shows a Blackhawk/Super Blackhawk mainspring (silver) with the Old Army mainspring (blued), both springs assembled on struts. Your Blackhawk Maximum should have the blued mainspring. If it is not the blued chromemoly spring, it has a been replaced. A replacement should not be lighter than the Old Army mainspring.
Have you experienced BLANKING or MISFIRES?
David Bradshaw
|
|
|
|
Post by leftysixgun on Jun 24, 2019 11:37:31 GMT -5
Im sill waiting for the max to arrive. I was asking about the spring weight incase a problem does arise.
|
|
|
|
Post by bradshaw on Jun 29, 2019 10:23:35 GMT -5
Im sill waiting for the max to arrive. I was asking about the spring weight incase a problem does arise. ***** I have never measured mainspring pressure. To do it, I would want a tool to measure the compression with HAMMER at REST and FULL COCK. And, on a double action, with hammer at DA COCK (double action lift is shorter than SA full cock, with consequent lower pressure. Because mechanisms differ, mainspring poundage is specific to one design and not accurately transferable. Hammer arc, height, weight, together with leverage angle of mainspring all factor into PRIMER INDENT. Suffice to say, when your Blackhawk Maximum arrives, it should have the blued Ruger Old Army mainspring, or equivalent. David Bradshaw |
|
|
|
Post by leftysixgun on Jun 29, 2019 11:16:24 GMT -5
My max arrived and I picked it up yesterday. The main spring is heavy and its blued. The whole gun is in really good condition!
The rear sight is 16 clicks per revolution.
|
|
|
|
Post by bradshaw on Jul 1, 2019 19:57:41 GMT -5
“.... I picked it up yesterday. The main spring is heavy and its blued. The whole gun is in really good condition!
The rear sight is 16 clicks per revolution.”
----leftysixgun
*****
Near as I can tell, Ruger introduced the 16-click elevation screw on or simultaneous to release of the Blackhawk .357 Maximum in 1982. Purpose, to make for finer increments than the 8-click per rev elevation screw preceding it, specifically for handgun silhouette. The SRM prototypes started in 1981 with the 8-click screw. Wouldn’t surprise me if some Maximums entered the pipeline with 8-click elevation screws.
David Bradshaw
|
|
|
|
Post by leftysixgun on Jul 1, 2019 20:18:02 GMT -5
What does SRM stand for?
|
|
|
|
Post by bradshaw on Jul 1, 2019 21:35:53 GMT -5
***** Officially, nothing. To my mind, “SRM" means "Sturm Ruger Maximum”. Nevertheless, I could pry neither Bill Ruger, nor Bill Ruger, Jr., to say so. There were seven long frame prototypes, serial numbered SRM-1 through SRM-7. Five had 10-1/2” bull barrels, target sights, two with 7-1/2” barrels, with silver-soldered ramp sights. All seven had what I called the “Maximum ejector” assembly, `but the Ruger’s called the “Bradshaw ejector,” or “long ejector.” As a further detail, the terms “ejector” and “extractor” were used interchangeably. I proposed an ejector long enough to lift the 1.605-inch .357 Maximum case clear of the chamber as a means to speed unloading on the silhouette firing line. Also, I was tired of partial extraction of .44 Mag cases in the Super Blackhawk. The SRM’s were assembled with the standard Blackhawk/SBH ejector rod spring. Recoil caused the rod to bounce like a slide hammer. Bill, jr., had longer springs made up. He also hardened the ejector rods, as we used the edge of a picnic table to extract brass from some HOT experimental ammo. David Bradshaw |
|
