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Shooting & Reloading - Mausers, Big Bores and others >> Lee Speed Forum & Archive

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Sarg
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Lee Speed to 8X57JRS ?
#200411 - 24/01/12 12:54 AM

Would like some thoughts on this , I have a old BSA sporter (Lee Speed) barrel shoot/rusted out , the one I shoot .318 8mm slugs in & it worked a treat , so I'm thinking of getting it rebored to 8mm .323 & rechambering to 8X57JRS , I had some 7x57 Rimmed rounds once & they look very much like a 303 Brit round , so I figure they will feed well from the mag .

8mm was a Lee Speed chambering to so would be legit , I know it was 8X50R-56R or some thing , but close enough & better , easier to find also .

Any one know the pressure of this round ?

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lancaster
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Re: Lee Speed to 8X57JRS ? [Re: Sarg]
#200414 - 24/01/12 02:51 AM

must be working, the lee enfield was also rechambered for the 7,62x54R so the magazine will have no problems with the thinner 8x57. why not stay with the 8x57 IR? you have to reload it but I suspect you will do this also with 8x57 IRS.
I have somewhere an articel from the old german hunting journal "Wild und Hund" in an early postwar issue where they reporting that many hunters shot 303 british military ammo in the common 8x57IR drilling that come out of the hiding. they turned down the rim thickness of the 303 but it dont shot very well because of the .311 bullet in a .318 barrel.

max pressure for 303 3200 bar
8x57 IR 2800 bar
8x57IRS 2900 bar

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Norwegian hunter misses moose, shoots man on toilet
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bringing civilisation to the barbarians

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DarylS
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Re: Lee Speed to 8X57JRS ? [Re: lancaster]
#200416 - 24/01/12 03:30 AM

Certainly do-able Sarg, but I'd keep the ballistics the same as a .303.
I just checked the 8x57JRS and the max is 48,000 CIP psi, so they are about the same. It's the rimmless that is higher pressured in Europe.

Edited to remove the 8x57JS specs.

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Daryl

"a gun without hammers is like a Spaniel without ears" King George V

Edited by Daryl_S (24/01/12 03:33 AM)

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Sarg
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Reged: 20/01/07
Posts: 1365
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Re: Lee Speed to 8X57JRS ? [Re: DarylS]
#200550 - 25/01/12 11:47 AM

Great info guys , so the SMLE action has been done in 7.62x54R , that would be quite neat to , I thought that it was a high pressure round ?

Interesting on the use of 303 in old Drillings after the war , may have worked better in some I suppose .

Thank you for the pressure info , I just could not find it , so it sounds like it would be good to go & a good round I think it is to !

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DarylS
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Reged: 10/08/05
Posts: 27000
Loc: Beautiful British Columbia, Ca...

Re: Lee Speed to 8X57JRS ? [Re: Sarg]
#200623 - 26/01/12 03:49 AM

7.62x54R is a 57,000 psi round according to my CIP chart. It would conceivably be fine in a #4 or #5, or reduced loading in a #3.

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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