Hello, everyone, that post by Hank45 got me thinking of accuracy of modern .22 ctgs. in vintage match rifles.  Last summer, I took out a Ballard 6 1/2 Rigby/Peterson .22 off-hand match rifle.  30" full-rnd. brl.  Vernier tang/Hadley style adj. appa. cup, & beach front.  Tried everything from Eley Tenex..Red box, to Win. T22.  It didn't care for the top-end expensive stuff.  Lapua Midas M was shooting well under 1/2"..some going into same holes!  CCI Green Tag averaged about 9/16..not too bad for practice. 
  Also took along Ballard 6 1/2 Rigby/Pope.  This one is a 1930 prone rifle, 28" #3 brl.  I had an early Lyman 10X Targetspot in blks.  This also didn't care for the Tenex, but was putting the Lapua into 3/8".  Green tag was going into 1/2".  All shooting for both rifles was at 50yds.
  Gary Quinlan was of the opinion that the best match .22's of the early 1900's were equilevant to our basic std. velocity.   
These .22's are habit forming...Just like peanuts..you can't just have one!

I've had real good luck with Remington subsonic 22lr in everything not a semi auto pistol or ruger 10/22 I try it in.

In our family, my wife is a very serious competitor in Rimfire Benchrest Association (RBA) and IR 50-50 matches.  Her rifles are custom built and specifically chambered for Eley EPS ammunition.  My rimfire rifles are older (much older) and chambered for whatever was popular when they were built.

What we've learned from each other is that Eley Tenex is a huge waste of money unless you're feeding it to purpose-built rifles with tuners.

We've also learned that less expensive ammo does not win matches regardless of rifle.  With rimfire ammunition, you pay for shot-to-shot consistency.  Bargain ammo is less consistent than more expensive ammo. That's the sad truth.

So, the older rifles get Eley Team, Eley Match, Eley OSP, and the remainder of a particulary good lot of RWS-R50 I purchased many years ago.

This is not an Eley ad.  We use Eley because we test a lot of ammo and this is the stuff that generates the best scores in the older rifles.  The point I'm trying to make is that you should look for ammo in the $10.00 to $13.00 per box category and test until you find what works in your rifle - just don't buy Tenex unless money is no object.  It gives you nothing in this application.

JackHughs