I'm very much a Barnes fan so I decided to post some of the diameter of several Barnes bullet/sabot dimensions. This will be helpful for people who are trying to find the right fit for their Muzzleloader barrel.

Barnes MZ
1) MZ (0.451" Flat Base)
HPH-12 =0.5040"
Harvester EZ high press = 0.5030"
Orange =0.5015"
Harvester Crushed Rib =0.5005"

Barnes TMZ (0.451" Boat tail)
Yellow (supplied) =0.5055"
Harvestor Yellow Crushed (for BT)=0.5030"

Barnes T-EZ (0.450" Flat Base)
Blue (supplied) =0.5005"
HPH-12 =0.5035"
Harvestor Crushed Rib =0.5000"

Barnes 285 spit fire
Blue (supplied) =0.5005"

PT GOLD 0.451" Flat Base
HPH-12 =0.5040"
Harvestor EZ High Pressure =0.5030"
Harvestor Crushed Rib =0.5010"