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Post by paul105 on Oct 31, 2013 18:29:58 GMT -5
Could somebody mic one of the .500 JRH cases that came from Jack H? I have some shortened .500 S&W cases with the rims turned down, and want to compare them to "factory" stuff provided by JRH.
Thanks,
Paul
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Post by bigbores on Oct 31, 2013 21:11:42 GMT -5
.545".
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Post by paul105 on Oct 31, 2013 22:13:21 GMT -5
Thanks,
Did you actually mic the rim diameter? Not trying to be argumentative, just trying to isolate a problem.
Paul
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Post by bigbores on Oct 31, 2013 23:11:34 GMT -5
just mic'd one at .543"
what problems are you having?
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Post by whitworth on Nov 1, 2013 6:07:13 GMT -5
Cartridges of the World (13th Edition) says .545, but my calipers on a piece of unfired Starline .500 JRH brass says .542.
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Post by paul105 on Nov 2, 2013 21:38:49 GMT -5
Thanks guys!
The gun is a Freedom Arms M83 that has been converted to 500 JRH that I picked up from another forum.
The gun won’t load live ammo or eject spent cases with the hammer in the half cock position. This occurs on three of the five chambers.
Charge holes will line up dead center with the loading port when the gun is at full cock or the hammer is down. The gun can be loaded (and cases freely ejected) when the hammer is in either position. Yes, I’m aware of the potential dangers of this practice.
Charge holes are slightly off center in relation to the loading port (very slightly over rotated) when the hammer is in the half cock position. This causes case heads to bind on the loading port at the 5 o’clock position when loading and binds/blocks ejection. On the second click the cylinder stops and is kept from rotating backwards by the nose of the pawl.
I thought this might be overcome by turning the case heads to a smaller diameter – I had to go down to .537” to get the desired results. I am not equipped to do this on more than a few cases (cordless drill/file) and don’t know what kind of problem(s) might result.
My understanding (which may be totally wrong) is that the nose of the pawl/hand starts the cylinder in motion when the hammer is cocked and keeps the cylinder from rotating counter clockwise when at half cock and is transitioned to the lower notch of the pawl for final lockup.
I don’t know how much of the nose of the pawl is still in contract with the ratchet when the bottom notch takes over. I don’t want a free spin pawl but also don’t want a carry up problem. So my next thought was that maybe the tip of the pawl could be very slightly (and it won’t take much) modified to allow the cylinder to rotate backwards several thousands of an inch.
I was hoping there might be a real easy fix, and I’m disinclined to make the problem worse (likely if I start fiddling with the gun).
I really like the gun and will call Jack next week.
Paul
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Post by paul105 on Nov 4, 2013 15:59:38 GMT -5
Talked with Jack earlier today. When I asked if the nose of the pawl could be modified, he said "noo, noo, noo, noo". The nose of the FA pawl is responsible for all of the cylinder's movement.
The loading gate port can be opened up a bit (no charge -- all work has lifetime warranty regardless of owner). Loading/unloading can be accomplished with hammer at half cock if cylinder is not allowed to rotate past the click without loading port mod.
FWIW,
Paul
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Post by bigbores on Nov 4, 2013 21:22:53 GMT -5
Talked with Jack earlier today. When I asked if the nose of the pawl could be modified, he said "noo, noo, noo, noo". The nose of the FA pawl is responsible for all of the cylinder's movement. The loading gate port can be opened up a bit (no charge -- all work has lifetime warranty regardless of owner). Loading/unloading can be accomplished with hammer at half cock if cylinder is not allowed to rotate past the click without loading port mod. FWIW, Paul Glad you got a fix coming! Mr Huntington is a first class guy. |
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