5.7x28FN TC barrel range report

[Camba]

As soon as I received my new 18" T/C barrel chambered in 5.7x28FN, I went to the range to sight it in.  I purchased one box of 50 rounds of the only factory load I could find in the LGS.  The load I use for sighting the rifle was the S195LF (27 gr Lead Free) which it cost me $32+ out the door (ouch). 
At the range, I was totally disapointed: the smallest group I cuold get with this load was 4 inches at 25 yards (bench rested and scoped).  I also noticed the impact were semi-key-holes in most of the cases.  I have no clue of what happened but the only thing I can think to try to make sense was the following:
a)  The 27 gr bullet was too light for a 1 in 12" rifling?
b)  The 27 gr bullet was not quite .224 caliber?  I use my caliper and I measure the bullet diameter and I got a .219" readings; but that could be because of the factory crimp or simply too much ogive taper of the bullet where I could measure it.
c)  Can the barrel be the culprit?  I don't want to think so but it could be possible.
I can't wait to get my reloading dies to start experimenting my own 5.7x28FN brewings.  Any one of you experience the same thing with the factory loads?  Please, share your experiences so I can learn.  Thank you.
Camba
 
Camba

[Camba]

   I can answer my own questions now.  Simply, the factory load I will never be able to solve because I will not buy any more of that type.  Reloading is great.  I am begining to get some 1/2" groups at 50 yards now.  Once I find the right load, I will move the target further to 100 yards to keep on tuning the load.  My rifle seems to like the H4198 powder really well in 45 and 55 gr sp bullets.  I have not checked the velocities yet but that is not a priority at this time.
I am also changing the "made in china" Tasco scope and I am putting a Leupold VxII 3x9x40 scope to see if that helps improve the group some.  If you have some other experiences with this round please share them.  Thanks.
 
Camba