I have used a .32 auto and .32 auto silver tip in my .32 long before but the performance of the weapon decreased dramatically. Also I heard it can ruin your weapon. I would not advise doing so. Too bad the longs cost twice as much.
J.Jasper
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The 5S prefix shows that you have a sweet-sixteen auto-5 shotgun that was made by FN of belguim for browning in 1965.