| 4seventy |
| (Sponsor) |
| 11/04/12 11:23 AM |
Re: Possible to convert a 9.3x72r to a 9.3x74r ??
|
Quote:
19 Long Tons is 42,560PSI 19.4 Long Tons is 43,680PSI
Daryl
"19 Long Tons" is an expression of weight, not pressure. The British (cartridge pressure) system uses (long) Tons per square inch. Tons per square inch was shortened to "Tons" on some of the proof stampings.
You cannot directly convert the British Tons per square inch cartridge pressure system, to psi {which has been measured using a different method}, in the way you have done it here.
Your method of simply multiplying the "Tons" by 2240 will give very inaccurate and dangerous results.
As I mentioned above, The British system rates the .375 H&H Belted Rimless Magnum at 19.5 Tons per square inch, and that is a 62,000 psi cartridge.
Quote:
By the looks of this, if there is enough steel for the re-chamber, one can hold pressure down by not shooting factory ammo and only shooting mid range handloads - more powerful than the 9.3x72, yet not as high pressure as 9.3x74 ammo 'could' be loaded to.
Regardless of what soft loads are intended to be used by the owner, the gun would still be required to withstand re-proofing.
This will be tested at FAR higher pressure than what a factory 9.3X74R is rated at.
Note....
I've edided my original wording in this post more than once in an attempt to clarify some points.