The cylinders on a .32 cal gun would be 8 - 8.5 mm in diameter. If it's really 7.5 mm it has to be something different, maybe one of the French 7 mm cartridges? Also, just as caution, the elg in oval is a black powder proof, so don't use modern cartridges in it.
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I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.
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