... and I'm not sure how I can make it work in this Yugo trunion.
Issue #1:
Notice that the chamber is threaded, and that it is thin enough that a normal-sized AK barrel pin would cut into the chamber.
I think the correct answer is to shim the pin hole in the trunion, and drill it for a thinner barrel pin like those found on a G3 or VZ-58. That would let me pin it, and keep the chamber intact.
Thoughts on a "skinny" barrel pin?
http://pookieweb.dyndns.org:61129/45-70/4570_win_barrel/win_barrel.htm
ETA - The barrel is cut so that the Winchester tube magazine lays against it... well when the barrel is rotated into the alignment where that is on the bottom, the threads reach up to about 1/3 of the barrel pin hole. It is too close to call - the chamber may not be cut into, but I can't be sure. If it is not cut into, I do know that the wall of the chamber will be *very* thin. Only the barrel pin will support the chamber in that case. Therefore, perhaps a not-so-skinny barrel pin would be better... ?
Issue #2:
Pressure will increase if the bullet is forced into the rifling - correct? Therefore, I wonder if the 500 grain loads, being longer, need to have the throat reamed?
I have yet to make a cast of the chamber, so this is speculative at this time.
Lyman measurements:
500 gr jacketed RN COL: 2.93" --- !!!
350 gr jacketed SP COL: 2.71"
400 gr jacketed FN COL: 2.55"
So that's .4" longer for the 500 grainers. These are intended for a Ruger Mk 1 or similar bolt-action style "heavy frame" rifle that is capable of the higher pressures the 500 grain loads produce - up to ~ 39,000 CUP according to the Lyman book. Even higher with the (hot) Hornady loads. Compare this to the average mid-30's CUP pressure of the lighter loads. (the Yugo / RPK / PSL trunion design is rated for up to 45-49,000 CUP found in the 7.62x54R).
Issue #1:
Notice that the chamber is threaded, and that it is thin enough that a normal-sized AK barrel pin would cut into the chamber.
I think the correct answer is to shim the pin hole in the trunion, and drill it for a thinner barrel pin like those found on a G3 or VZ-58. That would let me pin it, and keep the chamber intact.
Thoughts on a "skinny" barrel pin?
http://pookieweb.dyndns.org:61129/45-70/4570_win_barrel/win_barrel.htm
ETA - The barrel is cut so that the Winchester tube magazine lays against it... well when the barrel is rotated into the alignment where that is on the bottom, the threads reach up to about 1/3 of the barrel pin hole. It is too close to call - the chamber may not be cut into, but I can't be sure. If it is not cut into, I do know that the wall of the chamber will be *very* thin. Only the barrel pin will support the chamber in that case. Therefore, perhaps a not-so-skinny barrel pin would be better... ?
Issue #2:
Pressure will increase if the bullet is forced into the rifling - correct? Therefore, I wonder if the 500 grain loads, being longer, need to have the throat reamed?
I have yet to make a cast of the chamber, so this is speculative at this time.
Lyman measurements:
500 gr jacketed RN COL: 2.93" --- !!!
350 gr jacketed SP COL: 2.71"
400 gr jacketed FN COL: 2.55"
So that's .4" longer for the 500 grainers. These are intended for a Ruger Mk 1 or similar bolt-action style "heavy frame" rifle that is capable of the higher pressures the 500 grain loads produce - up to ~ 39,000 CUP according to the Lyman book. Even higher with the (hot) Hornady loads. Compare this to the average mid-30's CUP pressure of the lighter loads. (the Yugo / RPK / PSL trunion design is rated for up to 45-49,000 CUP found in the 7.62x54R).