SG,
Nope they are .451 Dia Drive band, X ,429 dia heel X .248 grn. heeled bullets with crimp groove and 3 driving bands, two lube grooves RFN.
44 Colt Bear Creek, .451 ball/44 Rem Mag case, 44 Rem./Colt
They are the 44 Rem/Colt 30 Grn.s BP This is the authentic load for original Remington and Colt Conversions discontinued in 1895. Old West re-introduced thois load for new Rem. conversions. I see no reason,that they would not work in new colt conversions as well..,except that no one makes a 44 Colt conversion Cylinder for the large colts. The new 44 Colt open tops take a .439 (the bear Creek shown) as they are not the original open top/conversion .451 groove cal.