Well if you that's your take on size vs scale you are probably better off with the Chieftain version as it would be 1/56. Imprint is 1/50 and there's only a four percent difference in scale. For me, I have a selection of 1/50 diecasts and I'm quite happy with how they scale up with my Eureka 28mm, which are probably a little smaller than some 28mm figures out there. Mine are based on washers too, not plastic bases that add another 3mm to their height.
Horses for courses and beggars can't be choosers. You use what looks right with 28mm. I'm happy with my 1/60 Dinky, my 1/50 Solido, the odd 1/64 and 1/55 scale car and even the Kitech BTR-80 I have.
Bear in mind that true scale isn't always so, even with injection moulded kits. I have an unbuilt Academy T-72 that is nominally 1/48 that is way over scale, it looks closer to 1/40 if truth be told Drew the line with that one, besides the kit had parts missing.