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A case diagram for
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-- Post at AustralianHunting.net, 01/04/2006
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Never directly use a published charge unless it is specifically marked as a starting load.
For all other listings, unless otherwise noted, reduce published charges by 3-5% to
produce a starting load for your gun. Then, incrementally work up,
being watchful for signs of over pressure. Best accuracy may be realized far below a listed maximum charge.
One may not be able to actually reach a full published charge if their gun produces greater pressure than was
experienced in the development firearm. Stay alert when reloading - be careful!
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 S.A.E. (in.)
 Metric (mm.)
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SPECIFICATIONS
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Bullet Diameter:
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.511 in.
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Max Overall Length:
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4.185 in.
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Rifling Twist:
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Rifling Lands:
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Case Capacity (est):
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406.9 gr. water
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Primer Size:
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.315 in.
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NOMINAL PERFORMANCE
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Bullet Weight:
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750 gr
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Muzzle Velocity:
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3400 fps
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Muzzle Energy:
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19261 ft-lbs
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"Easy Link" to this cartridge (copy and paste into emails, forums, etc.):
.50 McMillan Bros. (Fat Mac) - http://ammoguide.com/?catid=445
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Also called the 12.7x67mm, this cartridge is based on the 20mm artilley/cannon round.
Developed by the late Gale McMillan and his son Rock,
the round was introduced by McMillan Bros in
1996.
http://www.mcbrosrifles.com/
The "Fat Mac" was targeted for long-range
Fifty Caliber Shooters' Ass'n. (FCSA)
competitions.
http://fcsa.org/
A special primer insert is required to adapt .50 BMG primers to the 20mm case.
To compare .50 Fat Mac ballistics with the .50 BMG and .510 DTC
EUROP:
http://ammoguide.com/cgi-bin/bcompar...445%7c
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