Posted: 6/16/2010 11:27:59 AM EDT
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I have the 4" blued model Ruger GP100. I have noticed that with ammunition loaded with CCI primers, I very, very occasionally get a failure to fire with an apparent light primer strike. Every other kind of primer I've tried so far this hasn't been an issue.
I don't think it's the mainspring. I have the factory mainspring in it now and it's not showing signs of having been weakened. At one time, I even had a reduced power spring in it and this didn't seem to effect the frequency of failure to fires. I suspect too much of the hammer energy is getting dissipated into the frame somehow. Anyone know what could cause this and what the remedy is? |
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Quoted:
The hammer could be hitting the top of the transfer bar. Drop the trigger unit out and see if the transfer bar moves freely. Are these handloads or factory rounds? Blazer, Blazer Brass, Gold Dot, Lawman, or Lawman Clean-Fire? Define "moves freely". I've had the trigger components out of the gun before, and the transfer bar doesn't seem to bind on anything at all. With the hammer removed, the double action trigger pull is smooth and the transfer bar doesn't bind on the frame anywhere in the range of its normal up and down motion. As for ammo, it's both handloads and factory loads. My handloads with CCI small pistol magnum primers, and Blazer Brass 357 Magnum 158gr JHPs have both exhibited this problem very occasionally. |
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http://gunner777.wordpress.com/2008/08/24/ruger-gp100sp101book-of-knowledge/
Transfer bar, hammer and firing pin relationship: When the hammer strikes the transfer bar and in turn the firing pin, much of the energy is dissipated by the top step on the hammer hitting the frame. Instead of energy being efficiently transferred to the firing pin, much of the energy is wasted. This becomes very important when light hammer springs are used. You need all the energy you can get to prevent light primer hits. The solution is to remove some metal from the top step of the hammer so less energy is wasted |
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Quoted:
http://gunner777.wordpress.com/2008/08/24/ruger-gp100sp101book-of-knowledge/ Transfer bar, hammer and firing pin relationship: When the hammer strikes the transfer bar and in turn the firing pin, much of the energy is dissipated by the top step on the hammer hitting the frame. Instead of energy being efficiently transferred to the firing pin, much of the energy is wasted. This becomes very important when light hammer springs are used. You need all the energy you can get to prevent light primer hits. The solution is to remove some metal from the top step of the hammer so less energy is wasted Thanks for the info 
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