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Shooting & Reloading - Mausers, Big Bores and others >> Rifles
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John303
.300 member


Reged: 16/11/06
Posts: 243
Loc: Canada
Re: 7mm bore diameter USA - Europe
      10/03/13 12:30 PM

I believe it would come to "keeping in specification", in about everything produced.
For instance, lets take .284 as the needed diameter but the spec. may be .284 +/- .002.
So the item can be .282 to .286 and still be acceptable.

Another instance would be bullet wght., lets say 160 grains but if you weight a number of bullets
you will find a variation of say +/- 001 grain but all meet the spec.

Let us suppose you have a barrel at .282 and a bullet at .286 you might get some excessive pressure
but unless you are a target shooter it won't matter much.

Just to add the Cdn.280 Ross which still has a following mostly in Europe has a spec. of .287 bullet
dia. This may be the confusion.

FWIW --- John

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Entire topic
Subject Posted by Posted on
* 7mm bore diameter USA - Europe fourbore 10/03/13 12:10 AM
. * * Re: 7mm bore diameter USA - Europe grandveneur   10/03/13 07:46 PM
. * * Re: 7mm bore diameter USA - Europe fourbore   10/03/13 09:28 PM
. * * Re: 7mm bore diameter USA - Europe xausa   11/03/13 03:09 PM
. * * Re: 7mm bore diameter USA - Europe fourbore   12/03/13 11:56 PM
. * * Re: 7mm bore diameter USA - Europe Rolf   06/05/13 09:37 PM
. * * Re: 7mm bore diameter USA - Europe tophet1   10/03/13 07:50 AM
. * * Re: 7mm bore diameter USA - Europe fourbore   10/03/13 08:48 AM
. * * Re: 7mm bore diameter USA - Europe tophet1   10/03/13 09:08 AM
. * * Re: 7mm bore diameter USA - Europe Tom30887   10/03/13 10:48 AM
. * * Re: 7mm bore diameter USA - Europe John303   10/03/13 12:30 PM
. * * Re: 7mm bore diameter USA - Europe VonGruff   10/03/13 03:32 PM

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