I shoot slightly less than 10k rounds of SK, Lapua, and Eley Tenex combined per year. I compete in NRA Conventional Smallbore Outdoor Prone, and on occasion, ISSF 50M prone. My preference, and the general preference of other competitors within the disciplines are to test by lot, trying to gain ammunition that is of a
consistent velocity. The USAMU did this for many many years - I do not know if they still do. My preference was for ammunition that had an average velocity of 1055 - 1060 fps., as that grouped well in both of my rifles.
SK Standard Plus/Wolf Match Target were both made by SK, which was at one time owned by Lapua. If you examine the headstamp on all three, this will become obvious. All SK was made at the same time, and then lot tested. The most consistent became SK Rifle Match or Wolf Match Extra. The least consistent became SK Standard/Wolf Match Target.
My preference is to use SK Standard Plus for practice, Eley Match Black for 50 yd/50M competition, and Eley Tenex (Red) for 100 yd. competition. Eley has a lot test result database for each of their lots produced over the last 10 years. You visit their website, input your lot no.s into the blank field and they will show you the 10 shot test group that resulted from that particular lot. The group size and velocity consistency determine whether a specific lot is Match(Black) or Tenex (Red).
Many competitors used to try and find Eley lots that had been manufactured on certain machines (numbered 1-5). Eley recommended against this, as they stated that the machines were rebuilt from time to time, and that alone would change the characteristics of the ammunition.
Good luck and safe travels this weekend
@USMCDOC - I wish my prior commitment didn't prevent me from shooting the match with you this weekend.
-tc