Yes, I recently acquired a Remington 700 7mm Rem Mag that was manufactured in July, 1962. It was not marked "Stainless" on the barrel, even though it is polished blued 410 series stainless. Remington didn't mark them as "Stainless" until sometime in mid 1963. This rifle has a factory cutout at the top, in the rear portion of the action port. It's the only Remington 700 that I've ever seen with that.
I have another Remington 700 7mm Rem Mag that was manufactured in August, 1965 and the barrel is marked "Stainless". It is also polished blued 410 stainless but, does not have the cutout in the top rear action port. I know several cousins and friends have these mid 1960s Remington 700 7mm Rem Mags with blued 410 stainless barrel, and every one of these, including mine, shoot well below MOA for 3 rounds, with just about any factory round you put through it, in the140gr to 168gr range! I'm not sure why they shoot so good but, I've seen it first hand. ALL these shoot extremely well, where as you have about a 1 in 10 chance of finding a 700 7mm Rem Mag that shoots as well as these, manufactured after Remington began offering only chrom-moly or 416 series stainless barrels.