FLC OF CPR LTT DISCOVERS AFTER LNDG THAT THEY WERE USING THE WRONG APCH CHART ON THEIR DSCNT AND LNDG. NO PROBS RESULTED.

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WE WERE ON A TRIP FROM SLC TO RNO IN THE COMPANY LR35. AT APPROX 120 MI OUT WE RECEIVED THE ATIS. WX AT RNO WAS 800 FT OVCST; 3/4 MI VISIBILITY IN LIGHT SNOW. WE REQUIRED 600 FT AND 2 MI FOR THE SPECIAL USE CHART THAT WE HAD. AS WE GOT A LITTLE CLOSER A NEW ATIS WAS ISSUED INDICATING APPROX 900 FT OVCST AND 1 MI. WHEN WE SWITCHED OVER TO RENO APCH THEY WERE ACCEPTING ACFT FOR THE APCH TO RWY 16R. BASED ON THE PREVAILING CONDITIONS WE ACCEPTED THE ILS DME RWY 16R APCH TO RENO WITHOUT ANOTHER CHK ON THE WX. WE EXECUTED THE APCH AND LANDED WITHOUT INCIDENT. THE PROB CAME WHEN I WALKED INTO THE FBO. I OVERHEARD THEIR SCANNER WHICH WAS RECEIVING THE RENO GND; TWR; DEP AND APCH FREQ. THE APCH CTLR ISSUED A CLRNC TO AN ACFT FOR THE ILS DME 3 RWY 16R APCH. WE OPERATE IN AND OUT OF RENO ROUTINELY AND FELT A LITTLE STUPID AFTER A LITTLE INVESTIGATION THAT THERE IS ANOTHER SPECIAL USE CHART CALLED THE ILS DME 3 RWY 16R WHICH HAS EVEN LOWER MINIMA. I MADE A COUPLE OF MISTAKES HERE. 1) ACCEPTED AN APCH FOR WHICH I HAD NO APCH PLATE AND 2) I MADE AN ASSUMPTION THAT SINCE APCH WAS ACCEPTING ARRS THE WX MUST HAVE IMPROVED TO AT LEAST THE MINIMUMS 600 FT 2 MI THAT I NEEDED. POOR ASSUMPTION; POOR JUDGEMENT; POOR LISTENING SKILLS.