JES will rebore a 7.62x54r out to use a .35 caliber bullet. Rather big impact on both ends.

Since so many people look to the odd ball "hyper velocity pistol cartridges" for use in restricted hunting zones, shotgun or pistol caliber only, the nature of the 303 and 54r having that nice cartridge RIM makes them interesting for straight wall wild cats.

True the .303 turns into the short shell .410 but with RIFLE chamber pressure, it should do wonders with over sized bullets. Like a real gun, and if cut to minimum length to suit being a "pistol round", it should do quite well.

54r seems to be the say way. Massively thick case body..
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