So a while back I found a screaming deal on a slightly used Ruger New Model Blackhawk in 41 mag. I bought it, took it to the range and discovered that it had one of those “exhaust your forearm before the hammer finally falls” triggers. I shipped it off to Hamilton Bowen and got an action/trigger job and a longer firing pin installed.
While the gun was away, I spent some time loading some test loads. I got the piece back this week, took it out and brought it back home with several problems.
One load in particular has me scratching my head. I loaded a Sierra 210 gr JHP over 20.5 H110 with a CCI LP Magnum primer. This is listed as a starting load in Lyman and Speer manuals, and a mid range load in the Hodgdon manual. Lyman and Hodgdon use a regular primer and Speer uses a mag primer. All of the data list the load as a 1200 – 1400 fps load. For a six shot string my velocities were: 1272, 1335, 1285, 1287, 1204, 1132.
The problem for me is that every single primer came out flat as a pancake.
Does anyone have experience with a similar load? Could it really be the magnum primer that’s causing high pressure? I know that this is a fairly high pressure round, is this a common phenonenom?
One other issue. The cylinder pin is constantly working loose under recoil and tying up my gun. In hindsight, I probably should have had Bowen put in one of his super-duper cylinder pins but I was ignorant to this problem.
Does anyone have any experience with the Belt Mountain oversized cylinder pins? Are they easy to install?
Thanks and sorry for the book, (I didn’t draw a hunting permit, needed something to talk about!)