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Shooting & Reloading - Mausers, Big Bores and others >> Shotguns

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Longknife
.333 member

Reged: 17/04/08
Posts: 256
Loc: Illinois

20 bore BP pressures?
#337682 - 09/02/20 03:31 AM

Guys, I am looking for 20 bore BP shell pressure chart, any one have that info? Thanks, Ed

Edited by Longknife (09/02/20 03:33 AM)

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DarylS
.700 member

Reged: 10/08/05
Posts: 26488
Loc: Beautiful British Columbia, Ca...

Re: 20 bore BP pressures? [Re: Longknife]
#337684 - 09/02/20 04:53 AM

Longknife, the only text I know giving that info, is for ML's and is the Lyman BP handbook. CTG. pressures would be slightly higher. also, their pressure is in LUP, ie: lead units of pressure, not CUP ie: copper units of pressure, nor PSI done with pezio.

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

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

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dracb
.300 member

Reged: 28/02/13
Posts: 133
Loc: British Columbia

Re: 20 bore BP pressures? [Re: Longknife]
#337691 - 09/02/20 09:17 AM

These are not 20 gauge but they are modern loads reportedly developed by Hodgdon Powder Co. The presures reported here may give you an idea of operating pressures of blackpowder loads of old.

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"The problems we face today are there because the people who work for a living are now outnumbered by those who vote for a living."

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DarylS
.700 member

Reged: 10/08/05
Posts: 26488
Loc: Beautiful British Columbia, Ca...

Re: 20 bore BP pressures? [Re: dracb]
#337741 - 10/02/20 06:34 AM

In going through W.W. Greener's book, I see loads for 20 bore used in trials, to be 7/8oz to 1oz. with 2 1/8th drams,
ie: 58gr.Bp. This was ctg. in 1868 trials, I think. charges ran up to 2 1/2 drams: 68gr.

You can take from this, any load of powder under 3 drams
will produce less pressure than given in Lyman's book & indeed they do. The lightest loads given by Lyman are 2 1/2 drams, ie: 68gr.2F GOEX used for all loads.

In Lyman's book using:
7/8oz. with 3 drams (82gr.)Rem plastic piston 5,780 LUP
7/8oz with cards and plastic PGS over powder 6,820 LUP

1oz. shot Rem wad 3 drams 6,040LUP
1oz. shot Alan PGS + 1/2" felt - 3 drams 6,920 LUP

1 1/8oz. Rem wad - 3 drams 6,980LUP
1 1/8oz. PGS + 1/2" felt 3 drams 6,920LUP

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

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

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Longknife
.333 member

Reged: 17/04/08
Posts: 256
Loc: Illinois

Re: 20 bore BP pressures? [Re: DarylS]
#338176 - 20/02/20 04:22 PM

Thanks Daryl, That sure helps. I'm gonna save this info, got a little project i'm working on...Ed

--------------------
Longknife

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