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Below written by Guncrafter Industries on the 50 GI cartridge & firearm.
Introduced in 2004 and developed from the ground up specifically for their Model No.1 pistol. It is a very
strong, thick-walled cartridge which, when loaded, is approximately the same over-all length as a 45 ACP
round.
Due to the large caliber, the cartridge operates at relatively low pressures and has a long reloading life.
The concept was to create a practical .50 caliber 1911 without unnecessary bulk or weight, but with
increased knock-down power. Factory loads for the 50 GI  typically drives a 300 grain bullet at 700 -725
fps, which translates  into a 210 power factor. This is achieved without loss of controllability.
Firing this load feels comparable to shooting a standard .230 hard ball factory round.  However, the 50 GI is
a
very versatile cartridge and can be loaded to higher or lower levels, as desired.  Another factory load drives
the same 300 grain bullet at 875 – 900 fps and puts some serious stopping power downrange, while still
being quite controllable for the seasoned .45 ACP shooter.
The 50 GI  is a Proprietary Cartridge.
Outside case diameter of the 50 GI is .526" compared to the 45 ACP at .469".
The 50 GI rim is an extremely rebated cartridge and availible in 3 loadings
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by Guncrafter Industries
50-GI Proprietary Cartridges
CHP
FMJ
JHP
CHP
FMJ
JHP
CHP
CHP
CHP
FIRED CHP PROJECTILE
50GI
45ACP
50GI
45ACP
50GI
50GI
50GI
50GI
50GI
50GI
50GI
UN-FIRED
CHP
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50-GI,  300 Grain FMJ $ 3.75 ( Full Metal Jacket ) One Cartridge
No limit on buying amount.
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50-GI,  275 Grain JHP $ 3.75 ( Jacketed Hollow Point ) One Cartridge
No Limit in Buying
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50-GI,  230 Grain CHP $ 4.75 (Solid Copper Hollow Point) 1 Cartridge
Limit one per customer at this time.
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All Three of above 50-GI, FMJ, JHP, CHP for $ 9.99, save $ 2.76
Limit one per customer at this time
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Please note: We sell single cartridges to collectors, the below prices are for single cartridges or rounds,
not
boxes or 3 cartridges in the combo pack. Large amounts available at same prices, accept Copper H.P.. .