Out to lunch on your .30-30 as a moose killer north of the 49th! By far the Lee-Enfield No.4 in varied marks has killed more moose, deer and probably black bear than any other caliber rifle - probably all other calibers put together.
Yes, I know they are now getting rare and those are running low on rifling but their record will always stand.
I've dropped 17 White Tails, 5 Mules, 4 Black Bears and 11 Moose during my spotty 54 year effort as a hunter and all but 5 of the above were killed with a Lee-Enfield No.4, Mk.I from the Maltby. Mine is a Mk III SMLE that I kept the fine vernier iron sights on and simply sporterized the stock to my design and needs.
Shamefully, the only animal I ever lost was a White-tail I shot in heavy brush but the small blood trail gave out after 4+ hours of fruitless tracking. Custom loaded round-nosed softies .303 hit very hard as my much-loved and dearly missed German father-in-law could attest to. He was struck by one in a pitched battle with commonwealth troops during the invasion of Greece and was lame the rest of his life from a shattered femur.
Oddly enough, your comment about the Winchester .243 caliber put a wry smile on my face once I read further.
Your comments regarding the Winchester .270 caliber's unsuitability and the codicil that: "... in the right hands it is an adequate cartridge. It is another example of a flat shooting long range hunting rifle.."
That is precisely what I say when asked about my only other rifle, a .243 Winchester-powered Steyr I picked up 2nd hand back in the late 1990s.
In the last few years I have carried this gun to save a few pounds as I am not getting any younger, and claimed my first moose with this .243 in 2006 with a 7x fixed scope from 210 yards placing a 110gr. partition into his brain pan.
I assist my accuracy with an ancient bamboo ski pole I modified into a walking & shooting staff and a fixed 7x scope.
I have also taken 2 Whitetails and a Black Bear with it. I have always preferred a shot to the brain, cervical vertebrae, or heart in that order. I let them go if I cannot arrange otherwise.
Thanks very much for your ideas, views and sharing this site with others.