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L3324temp

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Posts posted by L3324temp

  1. A local club uses an small pancake air compressor and air chisel to install the spikes. With a long heavy extension cord and long air hose they can reach all the bays from a couple of outlets. Works well.


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  2. I'm familiar with setting the height of the 'camming pin', however how does one verify the wear of the spring under the sled?


    I dont know what the spring length or weight should be, so there is no direct test that I know of.

    Process of elimination would be the next best option. If you have set the adjustment properly, ruled out binding with a dirty feed ramp, shell plate timing/indexing or out of spec brass there isn’t much left other than that spring.

    You can also pull the spring, stretch it a bit and reinstall it. If things improve temporarily then it’s likely the spring. I would expect that to be a very temporary fix though.


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  3.  
    I read (yeah one of the worst phrases to use) that fast burning powders such as N320 and Titegroup will be fully burned by the time the bullet gets to the end of a 14.5/16" barrel.  The thread was originally discussing the best brakes for PCC and came to the conclusion that even with slow burning powders there wasn't too much "oomph" from the gas at the end of a long 9mm barrel. Obviously there is gas coming out, but it's not enough to work a brake to much effectiveness.  During the course of that discussion a few people were talking about velocity loss with fast powders and longer barrels.
     
    Now exactly how long a barrel needs to be to have this happen with a certain load work up?  I have no idea. To test it you'd need two rifles that are identical other than the barrel length. Say a 8" and 16" barrel. Maybe even a 12" barrel in between.
     
     



    All my tightgroup Pistol loads pickup a minimum of 150fps out of a 16” barrel. They also pickup quite a bit in an 8” sbr. I have never tested a 12” barrel to see if it is faster than a 16” but I doubt it would be.


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