The bullet pics don't show up??
Try 'reloading' the page.
... so this is a "Swift" brand 300 grain hollow point revolver bullet?
Yes, but Swift say it is also a muzzle loader bullet.
What diameter did it start as?
0.452"
Was it shot with a sabot or as a conical? What caliber rifle was it shot out of?
It was shot using a short black sabot from a 50 caliber rifle.
It kinda looks like the lead is bonded to the jacket too.
Swift say it is a bonded bullet.