Well I've tried some Eley Standard in it and it doesn't gave any better result than the cheaper ammo...I have one box of SK Pistol Match left, I'll give them a try next time, but I don't expect better result from it. Just like Dr.Lector said on this thread
http://www.canadiangunnutz.com/forum/showthread.php?t=400847&page=5
''To make your life easier, let me tell you that these barrels
are not meant for match-grade ammunition.
Lapua, Eley, or any similar ammo was not taken into consideration
when developing this barrel.
Of course, in some of the test barrels, some brands of better ammo
was occasionally tested (for shizzles).
But this barrel was intended from the very beginning
to make the best out of common and cheap ammo.
So, my advice is that you keep your money in the pocket and
not spend it on super grade ammo like Lapua Midas L
or Eley Tenex or whatever.
Don't get me wrong, these are excellent choices
for barrels like Lilja, Shilen or whatever, but chances are
you will NOT be impressed with the results of that ammo
in this particular barrel.''