Reloading GP-11 brass is not a good option and those bullets are not commercially available. There are published loads for boxer primed 7.5 Swiss for appropriate bullet weights.
The place to research that is on Swiss Rifles. As SS said, you can't get the exact bullets and reloading Berdan primed brass is a pain. But it can be done. Last I checked many think that Re17 is close to the powder that was used.
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