Update:
Today I performed the functions test with the somewhat controversial Golden Tiger 56 gr (not a typo!) FMJBT, Laquered Steel...
The below was my test set up for function:
1x LWRC M6A2 with Wolff XP Spring and Enhanced Firing Pin
1x Sig 516 with stock FP and trigger assembly
1x LWRC M6 with Geisselle SSA and stock FP
2x brand new Troy mags (for feeding consistency)
1000x Golden Tiger Laquered Steel 56 FMJBT:
Result:
-AR with Geissele SSA and Stock FP:
0 out of 5 rds functioned.. I stopped test at 5
- Sig516 with Milspec stock trigger and sotck FP:
3 out of 10 rds functioned
- AR With Wolff XP spring and upgraded FP:
60 out of 60 rounds functioned..
- AR with Geissele SSA but stock FP replaced by enhanced FP:
30 out of 30 ignition
So even the Geissele SSA trigger assembly with a hammer spring lighter than stock was able to reliably ingnite the Hard Primers on this ammo as long as it has the upgraded FP.
From this it's clear the determining factor is the firing pin and I will not be installing any more XP Hammer springs in my fleet.
Also while accuracy was not evaluated in a methodical way Golden Tiger's repuation for it seems justified:
When functions testing the ammo from the bench I my last 20 rds with my primary at a Index card size and shape target at 100m and hit it nearly every time.
An Index card is approx 3 inch wide when "stood up" so this point to a low MOA error especially as my rifle was not zeroed for this ammo and I was not shooting for zero (no bag) so I was introduced some inaccurcies of my own I am sure.
At 100 yards an index card is very very small in your sights..
Given that with the right FP the Ammo functions 100% for me , the excellent accuracy for an economy round , the internet user published chronos consistently above 3000 fps w/ the refence 20 inch barrel and the very smooth lacquer combined with the sealant around the neck and primer I am going all-in with this ammo.
So I just ordered a 3rd one of these for myself:
ar15xtreme.com/product/ar-platform-7-62-x-39-firing-pin/
And I also just ordered some more of this:
www.sgammo.com/product/223-556mm-ammo/1000-rounds-loose-223-rem-fmj-steel-case-russian-ammo-hard-primer-sold-read-dI still have stocks of Federal XM855 and PPU M193 (which is also exclleent but costs twice as much) and will sell them pockeitng half the money and using he other half for this ammo