Jack Suber Posted June 2, 2003 Share Posted June 2, 2003 Could someone tell me why people use long firing pins in Limited Guns? Do they increase reliability? If you do use one, how do you set them up with regard to firing pin spring, mainspring, etc.? Any feedback would be appreciated. Jack Link to comment Share on other sites More sharing options...
ErikW Posted June 2, 2003 Share Posted June 2, 2003 To prevent primer flow, which is essentially a melted primer. Link to comment Share on other sites More sharing options...
benos Posted June 3, 2003 Share Posted June 3, 2003 In some cases you may have to "tune" the length of a long firing pin. If so, set it up so the tip is just below (a couple thousandths) the breechface when the hammer is cocked. AS far as the other springs, just leave the way they are. If you are using very fast powders like Clays or Vit 320, they are good insurance. be Link to comment Share on other sites More sharing options...
Jon Merricks Posted June 3, 2003 Share Posted June 3, 2003 Jack, The two Limcat XL pins that I have used dropped in fine, no mods. I do not think would ever have to worry about light hits either. Link to comment Share on other sites More sharing options...
Jack Suber Posted June 4, 2003 Author Share Posted June 4, 2003 Thanks, guys. I was really just curious. I overheard some folks talking about them last weekend, but I never really got an idea as to why people use them. Brian, when you say they are good insurance with fast powders, what do you mean? Thanks. Jack Link to comment Share on other sites More sharing options...
h4444 Posted June 5, 2003 Share Posted June 5, 2003 I thought some guys were using them when they were running lighter mainsprings. Link to comment Share on other sites More sharing options...
Jon Merricks Posted June 5, 2003 Share Posted June 5, 2003 Jack, I would think he ment not having to worry about primer flow. Link to comment Share on other sites More sharing options...
Jack Suber Posted June 5, 2003 Author Share Posted June 5, 2003 John, Are you using one? Jack Link to comment Share on other sites More sharing options...
Jon Merricks Posted June 5, 2003 Share Posted June 5, 2003 Yes, I am using Limcat's XL pin. I would not have an S-I without one, open or limited. Link to comment Share on other sites More sharing options...
Singlestack Posted June 5, 2003 Share Posted June 5, 2003 I don't understand how they prevent primer flow. Anyone care to educate me? Link to comment Share on other sites More sharing options...
ErikW Posted June 5, 2003 Share Posted June 5, 2003 I don't understand how either, but a Limcat XL certainly did the trick on my Sooper. I would think they just take up the space that the melted material would otherwise flow back into. But I don't think that's all there is to it because they really seem to actually prevent the melting from occurring in the first place. All the primer hits are uniform; there's no occassional shiny one or flat one or cratered one; they all look the same. Link to comment Share on other sites More sharing options...
kevin c Posted June 8, 2003 Share Posted June 8, 2003 The brass actually melts, Erik? I thought cratering was a pressure effect - like a stamp impression. I didn't think the brass got hot enough long enough to melt . Link to comment Share on other sites More sharing options...
L9X25 Posted June 8, 2003 Share Posted June 8, 2003 The brass does not actually melt ... it is just pressed into the firing pin hole far enough that it is sheared off as the barrel unlocks and forces the brass downward. The deeper the tunnel to the firing pin is, the more slices of primer can build up and eventually cause the failure to fire. If the firing pin fills the entire tunnel, the brass cannot enter the tunnel to be sheared off. Even if there is still a small area, it is not deep enough for a significant quantity of primer to build up so that it could stop ignition. Be careful because the pressure is still there. Leo Link to comment Share on other sites More sharing options...
benny hill Posted June 9, 2003 Share Posted June 9, 2003 when you use fast powders with high pressures , you get primer flow. Try to use a slower powder to get rid of the prob. Link to comment Share on other sites More sharing options...
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