The 303 wildcats coming into existence were more about a lack of variety of calibres at that time rather the Oz ban of rifles of 303Br chambering. They got around the 303Br ban by taking up the 303 barrels by one thread and calling the resultant shorter chambering a 7.7x54. Projectile had to be pulled on std 303 round, shoulder pushed back, and projectile reloaded. The only ones that could have a proper 303 were graziers, ex service men, fishermen, rifle club members, pest eradicators. So the restriction was a tad full of holes. Outfits like Mick Smith Sports (large Sydney gun shop, now closed) did well out of selling the conversions.
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