4 4 CF ), ▁type ▁of ▁p istol ▁( re vol ver ▁only , ▁revol ver ▁or ▁p istol , ▁any ▁p istol ), ▁time ▁allowed ▁( 1 6 ▁hours , ▁ 6 ▁hours , ▁ 3 ▁hours , ▁ 2 ▁hours , ▁ 1 ▁hour ▁and ▁ 1 5 ▁minutes ), ▁and ▁most ▁recently , ▁format ▁of ▁the ▁final s ▁( car ry ▁over ▁scores , ▁start ▁from ▁zero , ▁number ▁of ▁sh ots ▁fired ▁in ▁the ▁final s ). ▁The ▁target ▁of ▁this ▁event ▁has ▁not ▁changed ▁since ▁ 1 9 0 0 , ▁and ▁the ▁ 5 0 m ▁distance ▁has ▁remained ▁the ▁standard ▁since ▁ 1 9 1 2 . ▁Compet itors ▁have ▁been ▁using ▁the ▁small - b ore , ▁rim - fire ▁cart ridge ▁since ▁ 1 9 0 8 . ▁The ▁sport ▁trac ed ▁back ▁to ▁the ▁beginning ▁of ▁ind oor ▁Flo bert ▁p istol ▁par lor ▁shooting ▁in ▁Europe ▁during ▁the ▁ 1 8 7 0 s , ▁which ▁in ▁turn ▁trac ed ▁back ▁to ▁ 1 8 th ▁century ▁p istol ▁du eling . ▁ ▁The ▁p istol ▁used ▁must ▁be ▁chamber ed ▁in ▁cal iber ▁. 2 2 ▁Long ▁R if le ▁am mun ition , ▁may ▁only ▁be ▁loaded ▁with ▁one ▁round ▁at ▁a ▁time , ▁and ▁must ▁have ▁conventional ▁" open " ▁or ▁" ir on " ▁s ights ▁( i . e . ▁optical ▁and ▁las er ▁s ights ▁are ▁not ▁allowed ). ▁It ▁must ▁also ▁be ▁held ▁and ▁operated