Gonna get mangled for this,but....... the 8MM Mauser hand-loaded to the gills with a 200 grain slug kills elk as nicely as anything else, range within reason.
And why wouldn't it??
Before I pruned the barrel on my 8MM, (Its 20" now) I was getting a chronographed 2800fps with a near max load of IMR 4064 powder and a Sierra 175 SP bullet. Where I to need this for elk duties, I would be looking at a premium bullet. Something like a Nosler 200 Partition, loaded at top accuracy first and top velocity second. Personally, with this load, I would limit my shots to about 300yards.
CW
Mauser98us and CW - I read your postings and mostly see something as I would have written! I LOVE YOU GUYS! and I love short barrels. My 18" 8x57 gets 2700fps with a 175gr Sierra and a full load of IMR3031. A 200gr Nosler Partition gets 2450fps with a dose of BallC2. I've never tried to get more fps as when I developed this load in 1984 for a Maine Moose hunt, I didn't find any data to fit this application and I got into the 8mm-06 data for what I ended with. COL is 3.25" the same as for the 8mm-06. Frankly, it has done the job. I use a 3x scope and have never felt either under-scoped or under-gunned. My longest elk shot has been 275 yards and it, what was that word "discombooberated"? Yeah, it did that!! Totally upended a big cow and went the full length of her, ending under the hide at the opposite end! Bullet found fully intact, though nicely mushroomed. Later lost the bullet through stupidity. Other elk taken with this rifle and load reacted the same way - discombooberated.
For short to medium range, your battery has a lot of overlap, from my perspective. I'm building a 35Whelen not because I need more, just because I like 35's and I found a 35Whelen barrel on GBO, and Dies on GBO, and I have a spare Rem 700 in 30-06 that I don't care 2 cents for. The 30-06 is a great rifle, just not my cup of tea.
I think you are looking at a magnum in the 33-37 caliber range to "fill your gap" so to speak as I see your "gap" as an available range concept more than a caliber concept. and they will kick you accordingly. Recoil becomes a big factor very quickly and you learn to control it or leave it in the rack. Again, all choices. Keep us posted as to your choice and the results of your choice. Happy New Year!
One more comment per 308/30-06 - I have both. If all there is amounts to a difference of 50fps, IMHO, that is no difference. If there is one thing the Chrony showed me, it was shot to shot variation. None of my rifles will give me a velocity of 2597fps. They may give me one shot at that velocity or even an average of that velocity, but the next day at the range that same box of shells may be 20fps different. That is still no difference. One thing hunting has shown me is that shot placement is more important than bigger/faster - without getting into extremely exagerated comparisons. (ie 22rf vs 500 thunderthumper) Also, 50 yards of available range is no difference, either. I can't judge the difference between 250 and 300 yards very effectively, but my rifle in my hands doesn't need that differentiated. The game still goes in the freezer. Game can't read ballistics tables. Our rifles are far more effective than paper ballistics. We owe it to our trophys to put in the practice time that it takes to know our rifles.
Know your rifle and take your shot. Your 308 is very capable.
Regards,
Sweetwater