The CLASS is determined by the shooter's scores, so changes if he/she improves.
Are you asking about the CATEGORIES OF COMPETITION?
B. Big Bore Competition
[FONT=Avenir 45 Book,Avenir 45 Book][FONT=Avenir 45 Book,Avenir 45 Book]1. Competition fired on full scale targets consisting of three Production handgun categories and three Unlimited handgun categories:
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[/FONT][FONT=Avenir 65 Medium,Avenir 65 Medium][FONT=Avenir 65 Medium,Avenir 65 Medium]Production (P) Unlimited (U)
Revolver (R) Unlimited Standing (US)
Standing (S) Unlimited Any Sights (UAS)
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[/FONT][FONT=Avenir 45 Book,Avenir 45 Book][FONT=Avenir 45 Book,Avenir 45 Book]2. Competition fired on half scale targets consisting of two Unlimited handgun categories:
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[/FONT][FONT=Avenir 45 Book,Avenir 45 Book][FONT=Avenir 45 Book,Avenir 45 Book][/FONT][/FONT][FONT=Avenir 65 Medium,Avenir 65 Medium][FONT=Avenir 65 Medium,Avenir 65 Medium]Unlimited Half-Scale (UHS) Unlimited Any Sights Half-Scale (UASHS)
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The letters in parentheses are the official abbreviations for each category (typical below).
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[/FONT]C. Small Bore Competition
[FONT=Avenir 45 Book,Avenir 45 Book][FONT=Avenir 45 Book,Avenir 45 Book]1. Competition fired on three-eighth scale targets consisting of three Production handgun categories and three Unlimited handgun categories:
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[/FONT][FONT=Avenir 65 Medium,Avenir 65 Medium][FONT=Avenir 65 Medium,Avenir 65 Medium]Production (P) Unlimited (U)
Revolver (R) Unlimited Standing (US)
Standing (S) Unlimited Any Sights (UAS)
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[/FONT]Yes, the same gun can be used in more than one category, which is not uncommon.