Back in the late '60s & early '70s, I mostly bought whatever was available at the discount stores. Seldom saw WW Super-X, and wasn't that often that I found any Remington, except in a few hardware stores. Mostly bought Federal Hi Power, because it was available, and it had decent accuracy. But back then, I didn't have any 22RF rifles that were exceptional accuracy-wise - a Winchester M250 lever gun that Dad bought for my 1st rifle, and a used Ruger 10-22 were about it. By 1993, I had put a relatively inexpensive Clerke .920" bbl on the 10-22, and had bought a new Rem 541T with prize money won at our club's annual 'All-around' shoot. In '94, I bought a case of Win Super-X hi vel 36gr HP ammo, my first quantity purchase, and it turned out to shoot really good groups out of that 541T.
Once the CMP started selling NIB surplus military trainers (Rem 540X & H&R M12 were what I bought), I started looking for better quality std vel 22RF ammo. But I didn't get serious about trying Eley, Lapua, and SK until the CMP made used Win 52D & Rem 40X rifles available at bargain prices. Talk about going down the22RF rabbit hole...