Cartridge: 500 Linebaugh
Firearm: Converted Ruger Blackhawk, 7.5″ Mag-na-ported Barrel
Powder: Blue Dot 18.0 grains, individually weighted
Bullet: 420gr Hunter’s Supply
Primer: CCI 350 Large Pistol Magnum
LabRadar series: 82
Shooting Record: 4/12/2017 @ Sunnyvale Rod & Gun
Velocity: 1180 fps average (7 shots)
Spread: 1193 – 1171 = 22fps
Std Dev: 7 fps (7 shots)
Drag Coefficient: -1.56 fps/yard over first 60 yards
Notes: Taffin Test data shows 18-20 grains of Blue Dot for “LBT #512.440 LFN (445 Grains)” with 18 grains giving “1037fps from a 5 1/2″ barrel.”
A LOT of recoil, but noticeably less than 525grain @ 980fps load. Lot of smoke. Low flash. I had poor accuracy, but I attribute it to poor control — I hadn’t shot this big of a bore in a while, and the smoke made it difficult to see POI corrections. No signal on bullet pull — I single loaded.
Primers were starting to look flat. No unburned powder. I am not comfortable increasing this charge without more data, and recommend starting lower.