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Hunter4752001
.300 member


Reged: 25/01/10
Posts: 124
Loc: Australia
Re: Backthrust on actions
      28/10/20 05:47 PM

The rearward thrust, called bolt thrust in bolt actions, is the product of the pressure times the surface area on which it acts. In the case of cartridges, the force we are interested in is that acting in the rearwards direction. It is the product of the pressure times the surface area of the inside of the rear surface of the cartridge ie not the surface area of the external dimension of the case rim. eg a 45-70 may have a rim diameter of .608 but the internal diameter is considerably smaller. It become important when someone claims that because something like the Baikal MP221 can take 30-06 pressures therefore you can use similar pressure loads in the 45-70 variant OOOPS.

As detailed above the locking mechanism on doubles also involves other torquing factors which means the end result isn't so simple.

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Entire topic
Subject Posted by Posted on
* Backthrust on actions AR2201 18/09/05 06:06 PM
. * * Re: Backthrust on actions NitroXAdministrator   28/10/20 04:53 AM
. * * Re: Backthrust on actions crshelton   28/10/20 02:13 PM
. * * Re: Backthrust on actions NitroXAdministrator   28/10/20 03:03 PM
. * * Re: Backthrust on actions Hunter4752001   28/10/20 05:47 PM
. * * Re: Backthrust on actions NitroXAdministrator   28/10/20 06:17 PM
. * * Re: Backthrust on actions DoubleD   28/10/20 11:29 PM
. * * Re: Backthrust on actions Otto   18/09/05 10:54 PM
. * * Re: Backthrust on actions sportingrifle   20/09/05 04:54 PM
. * * Re: Backthrust on actions AR2201   20/10/05 08:28 PM
. * * Re: Backthrust on actions 500Nitro   20/10/05 08:47 PM
. * * Re: Backthrust on actions AR2201   20/10/05 10:16 PM
. * * Re: Backthrust on actions unspellable   21/09/05 02:53 AM
. * * Re: Backthrust on actions 500Nitro   18/09/05 08:47 PM
. * * Re: Backthrust on actions AR2201   18/09/05 10:17 PM
. * * Re: Backthrust on actions 500Nitro   18/09/05 10:38 PM
. * * Re: Backthrust on actions AR2201   19/09/05 01:36 AM
. * * Re: Backthrust on actions 500Nitro   19/09/05 01:57 AM
. * * Re: Backthrust on actions banzaibird   18/09/05 10:55 PM
. * * Re: Backthrust on actions bonanza   18/09/05 11:41 PM
. * * Re: Backthrust on actions DUGABOY1   19/09/05 04:55 AM
. * * Re: Backthrust on actions banzaibird   19/09/05 06:02 AM
. * * Re: Backthrust on actions Marrakai   19/09/05 10:39 AM
. * * Re: Backthrust on actions 500grains   19/09/05 01:06 PM
. * * Re: Backthrust on actions AR2201   20/10/05 09:21 PM
. * * Re: Backthrust on actions banzaibird   18/09/05 11:53 PM
. * * Re: Backthrust on actions 500Nitro   18/09/05 11:53 PM

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