Quoted: Do you have any details on whether current Radway Green is effectively the same as other SS109-type rounds? You seem to be in a better place to find out than the rest of us.
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HAPPY TO HELP OUT
Brit ammo meets STANAG 4172
This is ALL L2A2 marked rounds61.7gr +/- 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 AR15FROM 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.
BASED ON THIS REVIEW IT WAS DETERMINED THAT ALL THE REQUIREMENTS, STATED BY THE UK AND NATO SPECS, WERE MET AND THAT THE ONLY CRITICAL ISSUE IDENTIFIED WAS A UK FINDING THAT STATED A PROBLEM WITH FAILURE TO CYCLE MALFUNCTIONS EXPERIENCED WITH CARBINE, 5.56MM, M4 (1005-01-231-0973) RIFLES DUE TO DIFFERENCE IN RIFLE DESIGN BETWEEN THE M16A2 5.56MM RIFLE AND M4 5.56MM CARBINE.
UK AMMUNITION SHALL NOT BE USED IN THE M4. (Gas port pressure issues)
THIS AMMUNITION WAS RELEASED FOR FULL USE IN THE M16A2 RIFLE AND M249 SQUAD AUTOMATIC WEAPON (SAW) AND IS ACCEPTABLE FOR USE IN WEAPON ZEROING AND QUALIFICATION FOR THE M16A2 AND THE M249.
THE UK 5.56MM AMMUNITION IS A BALLISTIC MATCH FOR THE 5.56MM: M855, BALL ROUND
(THE UK AMMUNITION DOES NOT HAVE A GREEN TIP, BUT IT SHOULD NOT BE CONFUSED WITH THE M193, 5.56MM BALL ROUND). NOT UNDERLOADED A lot of people have commented on the M4 working well and the A2 not!
I have found both worked fine with the post 98/99 L2A2 Ball.
It is all due to the gas system setup on the individual AR/M16/Rifle in question.
With regard to some people having problems with RG in their AR's on this site, I am guessing that they have rifles slightly out of the 'MIL Spec' tested tolerances, or perhaps in a few cases badly a fitted or worn gas system.
Edited to add from HOTGUN:-
That was an initial report, based on ...well a bad test.
Further testing found it works as well or better in the Carbine as it's shorter gas tube delivers a higher "punch" to cycle the weapon.