I haven't bothered trying it with the new barrel, but it shot well enough from my old 1:8 barrel, and shockingly well through the LMT 1:7 carbine I have. But match ammo is match ammo for a reason, and if I remember correctly, I think I've read that MK262 was designed for use in the SPR rifle, but also improves the performance of the M16 and M4.
Here you go:
http://en.wikipedia.org/wiki/5.56%C3%9745mm_NATO#Mk_262