Your description of cartridges that were introduced by Rocky Gibbs is very good.Originally Posted by nsaqam
In fireforming a case to a Gibbs chamber the requirement is that you maintain a tight headspace for the initial fireform. This can be accomplished, as you stated by creating a false shoulder. It can however be accomplished by using a bullet seated very long and pushed into the lands to hold the case tight against the bolt. In order to get a good fireformed case the case head needs to be held tightly to the bolt face.
I have a 240 Gibbs that I have fireformed cases for using both methods. The only drawback that I have with using a bullet into the lands is it wastes a good bullet and needs a medium load of powder, Where using a false shoulder I can use a small charge of a fast powder and a cotton ball.
Here is a pic of a Gibbs before and after fireforming using 30-06 brass
To the orignial post ...... mechanically, yes you can do as you described. NOT a good idea but it would do as you described.
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