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    Advisory Panel Patrick Chadwick's Avatar
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    Clearing up the confusion?

    F.W.I.W. here is the passage from the article by J-P Sedent on a modern cartridge for the Gras rifle:

    Le projectile devrait donc avoir un diamètre de 11,5mm pour les deux modèles d’armes, mais le tubage du fusil Chassepot modifié Gras ne permet pas l’utilisation d’un projectile calibré à fond de rayures. Les différents moules disponibles pour couler des projectiles destinés au fusil GRAS sont en général au diamètre de 11,25mm, et ces projectiles sous-calibrés ne sont pas, de ce fait, en adéquation avec le diamètre à fond de rayures du canon.

    In other words, you are likely to have difficulty with a bullet diameter of more than 11,25 in a "Grassepot" with a chamber insert, because of the restriction in the "tubage" i.e. the front end of the chamber insert, but in a newly built Gras (or, one would imagine, a Chassepot-Gras that has been rebarrelled) one can use bullets up to the groove diameter.

    Note that Sedent uses a bullet with 11.5mm (groove diameter) rings at the front, but 11.25 at the back, for the ring that are inside the case neck, to enable the cartridge to be chambered.

    Repeating my previous post, in the end it is a good idea to slug your barrel at both ends!
    Last edited by Patrick Chadwick; 04-08-2014 at 01:13 AM.

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