The Lapua Midas Ammo you have is very old - but the Midas I had in that box configuration (modern midas boxes/master boxes look much differenct) shot quite well in my 52. Standard club, aka Lapua Superclub (standard club is just sold for cheaper and come in bulk tins where as the Superclub comes in indivual boxes shoots well in most of my guns.
Overall however the most consistent ammo I have found is Eley Match EPS and Eley Tenex Ultimate EPS.
Great shooting Dave - those are some great groups (gotta like the bottom left)
Super7 - Here is how Midas/Master/EPS compared in my winchester 52. Groups aren't quite as great as Dave's but still average just a tad over 1/4"5 shot groups 50 yards.
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Did get one good group though (5 shots, 50 yards, Lapua Master M)
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What are you looking at for 500 of the Standard Club?