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Double Rifles, Single Shots & Combinations >> Double Rifles

AR2201
.275 member

Reged: 31/08/05
Posts: 57
Loc: Oz

Re: Aussies - who is interested in a Spartan?
09/09/05 08:37 PM

iwanadouble/500 Nitro

Precisely the point of going to the 45/90 WCF as you are not taking any chamber meat at all, nil, none, zip, the head and rim sizes are identical to the 45/70 you are literally just shaving 0.3" more length to the neck.

Compare the case dimensions. An important point is you can still fire 45/70 ammo as this part of the chamber remains untouched.

But, the extra case length is the lesser bonus, the big pay-off is it is in a double!

So what?

So the stupid OAL restrictions, (and flat nose slug requirement) that cripple the cartridge to feed it through a lever gun, are irrellevant.

You are free to relieve as much freebore as suits your whim.

Some of the bigger NE DRs came with a lot (0.75") of freebore, the thinking being it rounded the peak off the pressure profile.

So you can let it all hang out out front and, if the old timers knew their stuff, all for a lower peak to the pressure profile.

Relieving the throat makes for a whole different show.

You get more powder space for free. Your only question is what seating depth/crimp combo you require to hold the projectile under recoil?

Assume one diameter ie. 0.458", conservative?

Std 45/90 OAL 2.88" when using a 450gn Barnes Solid gives seating depth of 0.910" for OAL 2.880" with 53.6gns usable case capacity.

But with a throat relieved and a seating depth of 0.458 you get an OAL of 3.332" with 72.4gns of usable case capacity.

That is a big difference.

At 0.910" seating depth you are pushing the 450gn at 1,700fps, but, for the same pressure at 0.458" seating depth you are pushing the 450gn at 2000fps.

What pressure? SAAMI specification for the 0.444 Marlin (a modern straight wall cartridge for lever gun) is 42,000CUP, these numbers match to that (ignoring the long free bore = lower pressure claim) according to my you beaut ballistics program.

450gn at 2,000fps ............ and that is not pushing it (in fact deliberately and consistently erring on the side of caution).

450gn at 2,000fps ............ Buff?

Dream on.

AR2201
The sleep of reason breeds monsters

PS. this thing also comes in 30-06 SAAMI 50,000CUP, thats 19% more than the 42,000CUP for the 444 Marlin we are using as a reference.

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Subject	Posted by	Posted on
Aussies - who is interested in a Spartan?	NitroX	20/04/05 07:20 PM
Re: Aussies - who is interested in a Spartan?	AR2201	31/08/05 11:28 PM
Re: Aussies - who is interested in a Spartan?	vigillinus	03/09/05 05:01 PM
Re: Aussies - who is interested in a Spartan?	AR2201	04/09/05 08:10 PM
Re: Aussies - who is interested in a Spartan?	Michael	03/09/05 09:37 PM
Re: Aussies - who is interested in a Spartan?	AR2201	05/09/05 12:34 AM
Re: Aussies - who is interested in a Spartan?	Michael	05/09/05 04:38 PM
Re: Aussies - who is interested in a Spartan?	AR2201	05/09/05 06:49 PM
Re: Aussies - who is interested in a Spartan?	iwantadouble	09/09/05 12:26 PM
Re: Aussies - who is interested in a Spartan?	AR2201	10/09/05 07:50 PM
Re: Aussies - who is interested in a Spartan?	500Nitro	09/09/05 03:27 PM
Re: Aussies - who is interested in a Spartan?	500Nitro	09/09/05 11:08 PM
Re: Aussies - who is interested in a Spartan?	AR2201	09/09/05 10:59 PM
Re: Aussies - who is interested in a Spartan?	500Nitro	11/09/05 01:30 AM
Re: Aussies - who is interested in a Spartan?	AR2201	12/09/05 12:26 AM
Re: Aussies - who is interested in a Spartan?	500Nitro	12/09/05 01:14 AM
Re: Aussies - who is interested in a Spartan?	AR2201	14/09/05 01:19 AM
Re: Aussies - who is interested in a Spartan?	500Nitro	14/09/05 03:34 AM
Re: Aussies - who is interested in a Spartan?	500Nitro	28/10/05 12:36 AM
Re: Aussies - who is interested in a Spartan?	iwantadouble	12/09/05 06:58 AM
Re: Aussies - who is interested in a Spartan?	500Nitro	12/09/05 07:26 AM
Re: Aussies - who is interested in a Spartan?	CptCurl	11/09/05 04:49 AM
Re: Aussies - who is interested in a Spartan?	AR2201	12/09/05 12:50 AM
Re: Aussies - who is interested in a Spartan?	CptCurl	12/09/05 01:40 AM
Re: Aussies - who is interested in a Spartan?	AR2201	09/09/05 08:37 PM
Re: Aussies - who is interested in a Spartan?	NitroX	09/09/05 08:17 PM
Re: Aussies - who is interested in a Spartan?	500Nitro	03/09/05 10:14 PM
Re: Aussies - who is interested in a Spartan?	AR2201	01/09/05 06:39 PM
Re: Aussies - who is interested in a Spartan?	AR2201	04/09/05 06:57 PM
Re: Aussies - who is interested in a Spartan?	450_Ackley	01/06/05 05:14 PM
Re: Aussies - who is interested in a Spartan?	NitroX	06/08/05 02:08 AM
Re: Aussies - who is interested in a Spartan?	Marrakai	06/08/05 11:46 AM
Re: Aussies - who is interested in a Spartan?	Michael	07/08/05 01:29 AM
Re: Aussies - who is interested in a Spartan?	500Nitro	06/08/05 07:54 AM
Re: Aussies - who is interested in a Spartan?	500Nitro	07/08/05 01:31 AM
Re: Aussies - who is interested in a Spartan?	BillfromOregon	07/08/05 02:01 AM
Re: Aussies - who is interested in a Spartan?	NitroX	07/08/05 03:18 AM
Re: Aussies - who is interested in a Spartan?	cr500	07/08/05 06:24 PM
Re: Aussies - who is interested in a Spartan?	Michael	07/08/05 06:46 PM
Re: Aussies - who is interested in a Spartan?	cr500	09/05/05 10:24 PM
Re: Aussies - who is interested in a Spartan?	tunofun	13/05/05 08:28 PM
Re: Aussies - who is interested in a Spartan?	cr500	13/05/05 09:29 PM
Re: Aussies - who is interested in a Spartan?	tunofun	14/05/05 12:08 AM
Re: Aussies - who is interested in a Spartan?	cr500	06/05/05 10:29 PM
Re: Aussies - who is interested in a Spartan?	NitroX	09/05/05 01:56 AM
Re: Aussies - who is interested in a Spartan?	mickey	09/05/05 03:58 AM
Re: Aussies - who is interested in a Spartan?	NitroX	10/05/05 12:00 AM
Re: Aussies - who is interested in a Spartan?	500Nitro	09/05/05 06:01 AM
Re: Aussies - who is interested in a Spartan?	ALAN_MCKENZIE	20/04/05 11:34 PM
Re: Aussies - who is interested in a Spartan?	NitroX	21/04/05 03:12 AM
Re: Aussies - who is interested in a Spartan?	500Nitro	20/04/05 08:39 PM
Re: Aussies - who is interested in a Spartan?	NitroX	21/04/05 03:09 AM
Re: Aussies - who is interested in a Spartan?	500Nitro	21/04/05 04:58 AM
Re: Aussies - who is interested in a Spartan?	mehulkamdar	28/10/05 03:19 PM
Re: Aussies - who is interested in a Spartan?	tunofun	27/04/05 08:23 PM
Re: Aussies - who is interested in a Spartan?	tunofun	27/04/05 08:42 PM
Re: Aussies - who is interested in a Spartan?	PC3	20/04/05 09:41 PM

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