PMC manufactured ammo 40-65 260 gr. lead round nose bullet 1350 fps listed on box

my deceased older brother bought 10 boxes of this ammo to shoot in an original 1886 Winchester and a rolling block both chambered in 40-65,So I have 9 new boxes of 20 rounds per box and one box with 10 rounds unfired and 10 fired cases in that box.I can be reached at 575-430-1047 and thank you for looking at my adds.