Interesting thread. I have a 6.5 x 55 M38 and a 96 on the way as I type, . I have long liked the 6.5 for it's low recoil , and reputation as more than adequate for reasonable range hunting.
I recently picked up a sweet old Mauser 9.3 x 62 that will certainly take anything that walks, creeps fly's or slinks. For many years I have wanted a 7x57 , and now for some strange reason I find myself trying to justify getting a Tradex cracked stock 8x57 and putting a Boyds stock on it .
I am sold on Nosler partitions and with partitions in any of these calibers we can cleanly take anything Alberta has to offer us.
I really don't need any of the metrics, as I have a 243, 270, 30-06 , 30-30, 32 spl. as well as many Muzzle loaders from 45 to 58 cal. and a sweet little 57snider.
Wanting a European metric really comes down to just wanting another rifle to tinker with. If you don't reload ammo availability and choices can be frustrating .
If I had to chose between a 6.5 x 55 and an 8mm Mauser , the 6.5 with a 140 partition wins. It delivers more than the 243/ 100 gr partition, for moose or elk, and is similar to the 270 with a 130 partition and much less recoil than the 30-06 with 165 Partitions.
350 yards is a long shot, so any of these are more than adequate.
The next metric I get will be either a 7x57 or 8x57 , and it will come down to finding either one at the right price.
I was looking at an 8mm-o6 but it realy is less rifle than the 8mm Mauser, like the 338-06 is less than the 9.3x62.The 8mm Mauser and 9.3 are not bank breakers to purchase .
There are so many calibers out there that in reality just don't give any practical advantage when it comes to practical ballistics and use from one to another .
for the man that is wanting a rifle dedicated to 1 species the choices are easier than the man wanting a do all caliber.
Common sense says buy a 30-06 and live with the 1 caliber from Antelope to Moose with a 165 partition. Wants and desires say get a 9.3x62 , 243. and one of everything in between.
For this thread the 6.5 x 55 with a good bullet like the 140 partition seems more versatile from Antelope to moose and will be easier on the shoulders. Both will do quite well , so the choice becomes what one to buy first.
I don't need the 7x57 or a 7mm-08 , but these are on the want list and the one I get first will be the one with the best price.