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Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing
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akjeff
.300 member


Reged: 20/01/04
Posts: 121
Re: Spanish proof marks
      02/01/10 03:35 PM

Helps a lot Bramble, I was hoping you would see this and comment.

When you calculated the breech thrust/pressure on your 450#2, did you base the area on head diameter, rim diameter, or the diameter of the vessel i.e. the diameter of the inside cavity of the case at the base?

I found some factory specs of 450#2 ammo, namely 80gr cordite and a 480gr jacketed bullet. Looks like they generate anywhere from 13.0 to 13.7 ton. 13.7 ton converts to 30,688 psi. If the 30% rule is used, a "proof load" would need to generate around 40,000 psi?

I do believe this 10ga proofed at 14kpsi, should be a good candidate for a 450#2.

Regards,

Jeff

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Entire topic
Subject Posted by Posted on
* Spanish proof marks akjeff 02/01/10 09:53 AM
. * * Re: Spanish proof marks DoubleD   02/01/10 01:43 PM
. * * Re: Spanish proof marks akjeff   02/01/10 02:24 PM
. * * Re: Spanish proof marks Bramble   02/01/10 02:51 PM
. * * Re: Spanish proof marks akjeff   02/01/10 03:35 PM
. * * Re: Spanish proof marks Bramble   02/01/10 04:11 PM
. * * Re: Spanish proof marks akjeff   02/01/10 04:56 PM
. * * Re: Spanish proof marks Bramble   03/01/10 02:30 AM
. * * Re: Spanish proof marks akjeff   03/01/10 04:38 AM
. * * Re: Spanish proof marks AkMike   08/01/10 12:23 AM
. * * Re: Spanish proof marks akjeff   08/01/10 02:17 AM
. * * Re: Spanish proof marks AkMike   09/01/10 06:47 PM
. * * Re: Spanish proof marks akjeff   10/01/10 03:58 AM
. * * Re: Spanish proof marks AkMike   10/01/10 05:38 AM
. * * Re: Spanish proof marks akjeff   10/01/10 01:00 PM
. * * Re: Spanish proof marks vikram   15/01/10 11:03 AM

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