That's some impressive shooting.
Although I am of the opinion that someone starting in precision rimfire probably wouldn't benefit from shooting Eley Tenex so much as just getting more trigger time practicing the fundamentals.
It's like air pellets, the cheap ones are good enough until you can't get any better without getting better pellets. And when you need better pellets, you've shot tens of thousands of the budget pellets.
Of course there is the other school of thought, you should always use the best. In a perfect world where budget doesn't matter, I would agree.
But no one pays me to shoot competitively (and the Army only provides me enough ammo for basic qualification plus a little extra). I'd be in hog heaven if they did.