NBRSA short range 100 200 300 but mostly 100 and 200 now
a few years ago they changed that rule, now Edgewood bags make a bag to drape over the stock,
most stocks were triangular in the front end
my JTR was flat sided made by Robertson composites before their demise and used in 18 countries for the worlds
having said that light touching is ok as the gun can be lifted out under the old rules, the gun tracks straight back because of the sides as pictured
also then there is no interference with ANY VIBRATION, no matter how small or inconsequential
hope this help, shot short range for 2 decades and went to the worlds a few times
jeff