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Posted: 4/28/2006 7:26:16 AM EDT
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the brits RADWAY SS109 what Type of Powder do they use on there SS109 LOAD? |
| According to Widener's they use a "cylindrical, short cut" powder. |
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Brit ammo meets STANAG 4172 This is ALL L2A2 marked rounds 61.7gr +/- 1.7gr 3025 fps +/- 40fps (20" Barrel measured at 25M) Accuracy >4 moa Penetration:- 10 gauge SAE 1010 or 1020 steel plate at 570M / 623 Yards RG L2A2 BALL Chamber pressure = 4,000 bar MAX Port pressure = 880 bar MIN The British round uses Cut Tubular (NNN 241B) from Muiden Chemie International, Dutch. It is loosely akin to the old Nobel Rifle No.2 & No.3 propellants, it is also double based. Probably Alliant (Hercules) Reloder 11, Hodgdon H335, Vectan SP7, Vihtavouri N133, or Winchester 748 are the nearest burning rates available in commercial powders. This loading develops low chamber and port pressures to match the dwell time of the British service rifle, longer than the AR15, which requires a shorter sharper punch of gas pressure. Therefore it potentially feels less 'powerfull' to the shooter.......... Tested 1998 LOT L2A2 62gr SS109 BALL = 3100 fps 50F 500' 20" 1:7 AR15 FROM YOUR OWN US MILITARY :- UK 5.56MM CONFIGURATIONS WAS COMPARED AGAINST THE CORRESPONDING US 5.56MM CONFIGURATION FOR PERFORMANCE, SAFETY, AND RELIABILITY BY THE SUBJECT MATTER EXPERTS AT ARDEC TO ASSURE INTERCHANGEABILITY. |
This suggests that guaging the relative velocities of ammo based on recoil imulse ("it feels pretty hot") is not only imprecise, but might be outright false. I need to get a chrono. |
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