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Shamu View Drop Down
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Points: 16558 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: June 20 2023 at 6:11pm
Never heard of a Pakistani No4 7.62 conversion?
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Points: 13735 		Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: June 20 2023 at 8:13pm
not converted , purpose made 
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britrifles View Drop Down
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Points: 5613 		Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: June 21 2023 at 3:42am
Originally posted by Shamu Shamu wrote:

Never heard of a Pakistani No4 7.62 conversion? 

My mistake, I was thinking of the Ishapore 7.62.  Did Pakistan make No. 4 7.62 rifles? 

I would think the Pakistani No. 4 would have the same strength as the British and North American rifles had, if they were made from the same materials and same heat treatment. But, as in all metal structures, there are small variations in strength properties. 
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Points: 372 		Post Options Post Options   Thanks (0) Thanks(0)   Quote W.R.Buchanan Quote  Post ReplyReply Direct Link To This Post Posted: June 21 2023 at 8:57am
FYI guys I found this neato Calculator for converting CUP to PSI.


Wonder if anyone actually knows what the #4 actions were Proofed to?

"Strong Enough,"  is not an answer? It is more of a Question?

Randy
It's not how well you do what you know how to do,,, It's how well you do what you DON'T know how to do.
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Points: 5613 		Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: June 21 2023 at 9:27am
Randy, yes, the proof cartridge pressures are documented in various writings; in Reynolds book for sure.  IIRC, it was 25 TSI. 

But, the "tons per square inch" units of pressure measurement does not correlate to CUP or PSI standards used in the US and Europe, but refers to the unique British system of measuring chamber pressure (axial copper crusher method).  Somewhere on this forum is a post I wrote that describes it; extracted from a NRA American Rifleman magazine article in the 1960's.   The British system of Axial Pressure measurement typically gives a lower value than CUP (at the same actual peak pressure); IIRR, in the range of 80 to 90% of CUP.

A dry proof round was used to proof the barrel, and an oiled proof round was used to proof each action.  

The 18.5 TSI markings on the LE's released from service refer to the typical pressure of the MK 7 service cartridge, not the proof pressure.  If you convert that to a pressure measurement in lbs/in^2 gives 41,440 psi (2240 lbs in a British long ton); which you can see, is less than the usually accepted 45,000 CUP (US system of radial copper crusher method) as a safe maximum load for use.  
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Points: 250 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Long branch Quote  Post ReplyReply Direct Link To This Post Posted: June 21 2023 at 3:37pm
I just love how this thread keeps "waking up" after long periods of inactivity. :)
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Points: 213 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sapper740 Quote  Post ReplyReply Direct Link To This Post Posted: June 22 2023 at 2:27am
B.O.T.R. (Bloke on the Range), British Muzzleloaders, C&Rsenal, Forgotten Weapons are my  'to go to' YouTube posters for the most informative videos regarding firearms.  
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He's pretty good.
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Points: 40 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 450 Fuller Quote  Post ReplyReply Direct Link To This Post Posted: August 24 2023 at 3:00pm
Some of you senior lads might remember my
"strength tests" of a 2a1 awhile back. It was the bolt/extractor fatigue
and cartridge pressure issues that rendered that rifle inoperative.
Subsequent
test loading with 7.62 brass and 150 gr jacketed bullets have proven successful.


I have a M 98 custom Mauser that was well done by a Colorado gunsmith
in the late 1950s. It is chambered in 30-06 Ackley Improved, and an
accurate rifle it is. Strong action that digests fire-forming case loads
quite well.
New powders allow the 30-06 Ack Imp to reach 300 H&H velocities safely within
the 50 K psi range.

Because of 1895 Winchester and other older rifles in 30-06, W-W and R-P were slow to offer
ammunition in 30-06 loaded to the same pressure levels of the 270 WCF. (Though the identical modern rifles were chambered in both cartridges.) That practice ceased some years ago.
Only the dead have seen the end of war-Plato

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Points: 40 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 450 Fuller Quote  Post ReplyReply Direct Link To This Post Posted: September 10 2023 at 10:06am
While I got my 2a1 .308/7.62 back working normally, all bullets and loading will err on the side of caution with a dry chamber. Bullet weight kept to 150 gr
in the interest of pressures. Bottle neck cartridges tend to increase in pressure
as they are reduced in caliber (308 vs 243) all other areas being equal-as more powder and heavier bullets are used. Their cousins with relatively straight walled cases are more forgiving, as is the use of black powder. (As in 45-70, 45-90, and even mildly necked 577-450 BP used in the Martini derivative rifles.)
Years ago, either in the American Rifleman or Rifle Magazine, an author opined
that the rifles used in WWI and partly in WWII could be classed as:
The Mauser was a design adopted to war or sporting use; the Springfield was an
excellent sniper/target rifle, while the SMLE-Enfield design by James Paris Lee
may have been the best design for combat in the trenches and general warfare.

Older threads need awakening as the tree of liberty needs watering: they
reflect research and experimentation not easily found.
Only the dead have seen the end of war-Plato

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