Is there a MAP pressure spec for the 318 WR?

C.I.P. has established standards for the cartridge. They spec pressure in bar so you'll have to convert to psi. (1 bar = 14.5038 psi)

.318 WR C.I.P. specs

Looks as though the max average pressure is about 47.8ksi.

I do not want to start a war, but there is no direct conversion for bar to psi.


Ignore I was thinking Tin expression of proof to psi.

quote:

Originally posted by LHeym500:
I do not want to start a war, but there is no direct conversion for bar to psi.

There isn't? Snarky responses aside, I have in my ownership more handbooks, text books, reference materials and notes than I care to count that are consistent in that direct conversion from bar to psi.

quote:

Originally posted by LHeym500:
I do not want to start a war, but there is no direct conversion for bar to psi.

Are you perhaps thinking of CUP to PSI?

The bar to psi conversion may not be absolutely perfect, but it’s very close, and close enough. There is much more disparity when trying to covert CUP to PSI. Straight wall cases are pretty straight forward, but bottle neck cases can be a crapshoot. Thanks for the info!

quote:

Originally posted by DavidReed:
C.I.P. has established standards for the cartridge. They spec pressure in bar so you'll have to convert to psi. (1 bar = 14.5038 psi)

.318 WR C.I.P. specs

Looks as though the max average pressure is about 47.8ksi.

I was thinking the old Ton expression of proof or pressure you often see on Older British Shotguns and Rifles compared to PSI not BAR. My mistake.

It is Ton as expressed as proof that there is no direct conversion.

Well, er, ah I wouldn't swear to it but how about damn near like a 30-06! being technical and all. At least that's Idaho scientific!

The action would matter more than the cartridge.

Think of how 45-70 loads are rationalized.

Lowest would be trapdoor Springfield

2nd lowest would be Rolling blocks

3rd would be 1886 Winchester

4th would be 1895 Marlins

5th would be Ruger #1, Dakota M10, Hagn type falling blocks.

You could do the same for the 318.

quote:

Originally posted by Big Wonderful Wyoming:
The action would matter more than the cartridge.

Think of how 45-70 loads are rationalized.

Lowest would be trapdoor Springfield

2nd lowest would be Rolling blocks

3rd would be 1886 Winchester

4th would be 1895 Marlins

5th would be Ruger #1, Dakota M10, Hagn type falling blocks.

You could do the same for the 318.

The original 1886 Winchester’s marked with Nickel steel barrels are as strong as Marlin 1895s. The Japanese and Italian made 1886s are quite a bit stronger than Marlin 1895s.

Thanks Matt,

I must have switched those in my brain.

From what I understand the very small amount of metal on the Marlin action between the threaded barrel hole and the magazine hole, further being undermined when Marlin was using Acme thread on the 45-70 is a weak point. Then they changed to V thread to made it stronger. In my opinion the modern 1886 far exceed the Marlin in strength. Don't forget that the Model 71 Winchester was just an 1886 chambered in 348 Win which ran much higher psi then a 45-70. Winchester also in the past had put out some dangerous pressure 348 ammo too!!

quote:

Originally posted by ColoradoMatt:
Is there a MAP pressure spec for the 318 WR?

According to QL 47,862 psi and 3300 bar for the 318 Westly Richards

I'd buy that for most rifles.

but if I chopped up a model 70 in 270 win I'd use that as a starting point.
meh or not,, how much velocity do you need, and where is the accuracy node?
that's more like where I'd stop.

Writer/hunter Craig Boddington owned a 318 WR
original. He stated in the newest Safari Rifles II
that original Kynoch 250 gr cartridges barely got
to 2100 fps. But they penetrated deeply...

I can get 2150 fps from original 225 Barnes RN in my 30-06 Ackley Imp Mauser, which is very close to the 318...but better SD/ slow H-870 powder. Another 338-06 early Model 70 will beat that with 225-250 gr Noslers and RL-15 or CFE 223 powder.

The 338-06 is a closer comparable caliber to the .318 WR or the 333 Jeffery.