GDHP

AcronymDefinition
GDHPGold Dot Hollow Point (ammunition)
GDHPGeneralized Diffie-Hellman Problem (number-theoretic reference problem)
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The Global Digital Health Partnership (GDHP) is an international collaboration of governments, government agencies and multinational organisations dedicated to improving the health and well-being of their citizens through the best use of evidence-based digital technologies
GDHPs gives me muzzle velocities over 1,600 fps with the .327 Magnum in the Marlin while 12.5 grains of H110 ups the muzzle velocities to well over 1,700 fps and 11.5 grains of AA9 increases this to over 1,800 fps.
CHRONOGRAPH AND ACCURACY TEST: SW99 COMPACT 9MM FACTORY LOAD BULLET VELOCITY GROUP WEIGHT (grs.) (fps) SIZE (ins.) Winchester USA 115 JHP 1,113 2.25 Black Hills 124 +P JHP 1,155 1.38 Speer 124 +P GDHP 1,171 1.25 Speer 147 GDHP 927 1.5
10mm GDHP (1,100 fps) in the Personal Protection line, which should be ideal for fans of this resurgent "Heavy .40" powerhouse.
Federal's load with the slightly heavier Speer 115 GDHP comes in at 1,540 fps while the little 85-gr.
FACTORY AMMO PERFORMANCE LOAD VELOCITY GROUP SIZE (BRAND, BULLET WEIGHT, TYPE) (FPS) (INCHES] 0 .38 Black Hills 125 JHP +P 760 1 .38 Black Hills 100HB+P 978 2 .38 Buffalo Bore 125 LFHP 870 1-1/2 .38 Buffalo Bore 158 LSWCHP 834 3/4 .38 Buffalo Bore 150 HCWC 837 3/4 .38 Buffalo Bore 110 Barnes Tactical 971 1 .38 Hornady 140 XTP-HP 690 1-1/8 .38 Speer 125 GDHP 855 1-7/8 .38 Winchester 110 Silvertip 830 1-1/4 .357 Black Hills 158 LFP 831 7/8 .357 Hornady 125 XTP 1,213 7/8 .357Speer 125 GDHP 1,123 1-1/8 .357 Winchester 110 Lead Free JHP 1,147 7/8 Notes: Groups the product of best 4 out of 5 shots at 7 yards.
For the .45 ACP leg of our caliber trifecta we used the Barnes +P 185-grain TAC-XP and the standard pressure Speer 185-grain GDHP.
Upon running a cross section of .22LR and .22 Magnum loads over Oehler's Sky-screens to check velocities (ranging from a low of 1,045 fps with Eley 40-grain FN Edge to 1,324 with CCI 40-grain GDHP Velocitor), the G&A staff settled into the shooting bags and zeroed in with the .22LR version first.
GDHP, and the only reason I missed was because I missed, not because the pistol couldn't do it.
25-YARD BENCHREST ACCURACY PERFORMANCE AMMO TYPE GROUP SIZE(inches) Smallest Largest Average Federal Personal Defense Hydra Shok 135-grain JHP 2 1/2 3 15/16 3 1/16 Speer Gold Dot 147-grain GDHP 3 1/4 4 3 3/16 Winchester Personal Defense 147-gr.