Re: how do u blow out a case to hold more powder
Well, the comment blowing out a case has to do with wildcatting an existing case to increase the powder volume.
All cases have some taper to their body sections. This is needed so that the case will easily pop loose from the chamber after firing. The less taper you have the more difficult extraction can be so there is a certain point where we have to stop.
Most modern case designs, at least the ones in the last 30 years are minimal in taper, there are exceptions.
The rounds with the most taper such as the 22-250, 257 Roberts and for the big guns the 338 Lapua gain the most volume when their body taper is reduced and the shoulder diameter increased.
Rounds such as the 308 family and WSM rounds do not gain as much percentage wise.
TO do this a chambering reamer need to be built to the specs you want and your chamber then needs to be recut to these new dimensions.
Then, in most cases a standard parent case can be fired in this new fatter chamber and the pressure of the round will blow the parent case out to fit the larger dimensions of the new chamber.
Care should be taken though as some case modifications require special steps to insure safe headspace gas seals if the shoulder is set back any amount.
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