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DarylS
.700 member


Reged: 10/08/05
Posts: 26573
Loc: Beautiful British Columbia, Ca...
Re: 7X57 bullet choice
      03/12/12 10:08 PM

My data all stops at around 48,000CUP for 3,000fps with 120's in the 7x57. I see 7mm08 listed to 3,100fps+ using 120gr. TSX's but with one powder only in Barnes text.

I also have data for 6.5x55 and .260 Rem. pushing 120gr. at over 3,000fps.- so if the guy was stretching the 7x57 closer to 65,000psi, it's possible along with 24" or more of barrel, to get 3,200fps, I suppose. Much over 65,000psi and you exceed the elasticity of the brass and expand primer pockets as well as making extractor groove marks on the case head. As well, extraction gets sticky - that's a prime indicator to say you've gone too far.

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


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

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Entire topic
Subject Posted by Posted on
* 7X57 bullet choice tward1604 30/10/12 11:03 AM
. * * Re: 7X57 bullet choice DarylS   30/10/12 12:03 PM
. * * Re: 7X57 bullet choice tward1604   30/10/12 12:21 PM
. * * Re: 7X57 bullet choice DarylS   30/10/12 01:20 PM
. * * Re: 7X57 bullet choice Viking338   30/10/12 07:56 PM
. * * Re: 7X57 bullet choice Phillip   31/10/12 12:42 AM
. * * Re: 7X57 bullet choice Caprivi   31/10/12 01:37 AM
. * * Re: 7X57 bullet choice MikeRowe   31/10/12 02:17 AM
. * * Re: 7X57 bullet choice NitroXAdministrator   31/10/12 02:24 AM
. * * Re: 7X57 bullet choice tward1604   31/10/12 08:11 AM
. * * Re: 7X57 bullet choice NitroXAdministrator   31/10/12 04:48 PM
. * * Re: 7X57 bullet choice DarylS   01/11/12 01:27 AM
. * * Re: 7X57 bullet choice tward1604   01/11/12 02:43 AM
. * * Re: 7X57 bullet choice zimhunter   01/11/12 02:52 AM
. * * Re: 7X57 bullet choice StephenCoker   01/11/12 06:22 AM
. * * Re: 7X57 bullet choice tophet1   01/11/12 09:59 PM
. * * Re: 7X57 bullet choice alexbeer   02/11/12 08:39 AM
. * * Re: 7X57 bullet choice Azone   23/11/12 09:54 AM
. * * Re: 7X57 bullet choice Azone   23/11/12 10:31 AM
. * * Re: 7X57 bullet choice albertan   30/11/12 07:53 PM
. * * Re: 7X57 bullet choice Homer   03/12/12 05:14 PM
. * * Re: 7X57 bullet choice DarylS   03/12/12 10:08 PM
. * * Re: 7X57 bullet choice VonGruff   04/12/12 04:53 AM
. * * Re: 7X57 bullet choice DarylS   04/12/12 08:26 AM
. * * Re: 7X57 bullet choice VonGruff   04/12/12 09:39 AM
. * * Re: 7X57 bullet choice DarylS   05/12/12 03:39 AM
. * * Re: 7X57 bullet choice Azone   08/12/12 06:39 AM
. * * Re: 7X57 bullet choice DarylS   23/11/12 10:57 AM
. * * Re: 7X57 bullet choice bakposten   31/10/12 08:48 AM
. * * Re: 7X57 bullet choice 93mouse   31/10/12 09:19 AM
. * * Re: 7X57 bullet choice Deutsche_Vortrekker   31/10/12 02:35 PM
. * * Re: 7X57 bullet choice eagle27   31/10/12 04:20 PM
. * * Re: 7X57 bullet choice Deutsche_Vortrekker   31/10/12 12:41 AM
. * * Re: 7X57 bullet choice VonGruff   30/10/12 06:50 PM

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