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Double Rifles, Single Shots & Combinations >> Double Rifles

DarylS
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Reged: 10/08/05
Posts: 27009
Loc: Beautiful British Columbia, Ca...

Re: (was 3006 or 45/70 remSxS) ->-> C.U.P. VS P.S.I. Handloads
02/07/12 06:43 AM

The .30/06 has a ceiling of about 50,000CUP SAAMI and 51,000 CIP (both copper crusher method), which is listed also, as 60,000PSI SAAMI and 59,000PSI CIP.

The .45/70 is listed in the same chart as 28,000 PSI SAAMI and 32,000CUP CIP(Euro). Their copper crusher listings are 28,000 CUP SAAMI and 29,000CUP CIP. Go to http://kwk.us/pressures.html and see for yourself. Bookmarking this site will come in handy. Also - read the text as it explains points of measurement by either system and why the numbers don't always 'Jive'.

The .45/70's ceiling is what the rifle mfg'r says it is, in this case 31,990 or whatever PSI - note, that with the .45/70, and many other straight sided cases, PSI and CUP are indentical or exceptionally close numbers, ie: equal - 30,000CUP is 30,000PSI. It is with the bottle necked rounds where they become quite different.

Also note that Speer's manual lists loads for the Lever guns which Hodgdon then states are OK for Trapdoor Springfields because Speer limits the lever gun pressures to 28,000CUP(ie: 28,000PSI) or less. It is interesting they don't agree, but then, what would be the fun of that?

Hornady lists lever gun pressures to over 40,000PSI/CUP, as-does Hodgdon, while they maintain 'WEAK' actioned .45/70s at 28,000CUP/PSI.
Even at low pressures of 28,000PSI- almost 2,000fps can be obtained with 350gr. bullets - no flies on those ballistics. Try a 405gr. RP at 1,800fps and see it stagger a moose or elk.

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

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

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Subject	Posted by	Posted on
3006 or 45/70	TomN	04/04/12 11:32 AM
Re: 3006 or 45/70	FATBOY404	04/04/12 01:12 PM
Re: 3006 or 45/70	guns68	04/04/12 01:46 PM
Re: 3006 or 45/70	tinker	04/04/12 02:29 PM
Re: 3006 or 45/70	mauserand9mm	04/04/12 05:11 PM
Re: 3006 or 45/70	guns68	05/04/12 07:03 AM
Re: 3006 or 45/70	AkMike	05/04/12 08:32 AM
Re: 3006 or 45/70	guns68	06/04/12 12:07 PM
Re: 3006 or 45/70	AkMike	06/04/12 12:59 PM
Re: 3006 or 45/70	ruffcountry	06/04/12 02:56 PM
Re: 3006 or 45/70	TomN	05/04/12 01:50 PM
Re: 3006 or 45/70	mauserand9mm	05/04/12 02:41 PM
Re: 3006 or 45/70	TomN	06/04/12 11:50 AM
Re: 3006 or 45/70	mauserand9mm	06/04/12 07:19 PM
Re: 3006 or 45/70	TomN	07/04/12 11:24 AM
Re: 3006 or 45/70	kamilaroi	08/04/12 03:52 PM
Re: 3006 or 45/70	gallatin	10/04/12 03:37 PM
Re: 3006 or 45/70	DarylS	11/04/12 12:35 AM
Re: 3006 or 45/70	TomN	11/04/12 10:44 AM
Re: 3006 or 45/70	AkMike	11/04/12 11:11 AM
Re: 3006 or 45/70	TomN	20/04/12 10:45 AM
Re: 3006 or 45/70	TomN	13/05/12 03:27 AM
Re: 3006 or 45/70	AkMike	13/05/12 01:42 PM
Re: 3006 or 45/70	TomN	14/05/12 01:11 AM
Re: 3006 or 45/70	AkMike	14/05/12 03:02 AM
Re: 3006 or 45/70	Fjold	14/05/12 09:44 AM
Re: 3006 or 45/70	TomN	14/05/12 01:16 PM
Re: 3006 or 45/70	TomN	18/05/12 01:22 PM
Re: 3006 or 45/70	TomN	26/05/12 06:01 AM
Re: 3006 or 45/70	DarylS	26/05/12 07:25 AM
Re: 3006 or 45/70	TomN	26/05/12 10:38 AM
Re: 3006 or 45/70	AkMike	26/05/12 11:46 AM
Re: 3006 or 45/70	TomN	27/05/12 02:22 AM
Re: 3006 or 45/70	Fjold	27/05/12 12:58 PM
Re: 3006 or 45/70	bwananelson	27/05/12 02:28 PM
Re: 3006 or 45/70	NitroX	27/05/12 07:53 PM
Re: 3006 or 45/70	TomN	28/05/12 12:36 AM
Re: 3006 or 45/70	Fjold	28/05/12 04:03 AM
Re: 3006 or 45/70	TomN	04/06/12 08:48 AM
Re: 3006 or 45/70	DarylS	04/06/12 10:21 AM
Re: 3006 or 45/70	Bill_Cooley	04/06/12 12:36 PM
Re: 3006 or 45/70	TomN	04/06/12 01:23 PM
Re: 3006 or 45/70	TomN	01/07/12 10:39 AM
(was 3006 or 45/70 remSxS) ->-> C.U.P. VS P.S.I. Handloads	tinker	01/07/12 01:43 PM
Re: (was 3006 or 45/70 remSxS) ->-> C.U.P. VS P.S.I. Handloads	DarylS	02/07/12 06:43 AM
Re: (was 3006 or 45/70 remSxS) ->-> C.U.P. VS P.S.I. Handloads	ruffcountry	02/07/12 02:01 PM
Re: (was 3006 or 45/70 remSxS) ->-> C.U.P. VS P.S.I. Handloads	DarylS	03/07/12 02:47 AM
Re: (was 3006 or 45/70 remSxS) ->-> C.U.P. VS P.S.I. Handloads	TomN	03/07/12 12:43 PM
Re: 3006 or 45/70	TomN	13/05/12 03:22 AM
Re: 3006 or 45/70	DarylS	20/04/12 12:53 PM
Re: 3006 or 45/70	TomN	20/04/12 01:49 PM
Re: 3006 or 45/70	DarylS	21/04/12 01:11 AM
Re: 3006 or 45/70	AkMike	20/04/12 11:37 AM
Re: 3006 or 45/70	pricedo	16/09/12 01:49 PM
Re: 3006 or 45/70	Michael	18/09/12 12:16 AM
Re: 3006 or 45/70	pricedo	18/09/12 02:41 AM
Re: 3006 or 45/70	DarylS	18/09/12 03:19 AM
Re: 3006 or 45/70	tinker	18/09/12 03:35 AM
Re: 3006 or 45/70	DarylS	17/09/12 01:53 AM
Re: 3006 or 45/70	TomN	08/04/12 05:50 AM
Re: 3006 or 45/70	AkMike	08/04/12 06:25 AM
Re: 3006 or 45/70	TomN	08/04/12 09:42 AM
Re: 3006 or 45/70	DarylS	05/04/12 01:38 AM

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