6.5x55 Swede
Is a fine round. The only handicap it has is that it is not loaded to "modern" pressure levels. The performance of the round is superb, even at the "lesser" pressures of the old cartridge.
I have one of the 95 Mausers, mfgd in 1917, the rifle with it's 29.1 in barrel. I have had one of the Swede carbines, and I wish I had that rifle back.
I knew one guy who had his model 70 Winchester rebarreled to 6.5 Swede, he loved the round so much.
The 6.5mm bore has exellent sectional density, which results in long range performance much better than you would expect, even with moderate velocities.
I understand the Swedes use the round for moose and caribou, although they have some pretty strict rules, and require hunters to prove their accuracy before taking the field.
The round does have a bit more recoil than the .243, no getting around that, you are launching heavier bullets. The modern .260 Remington basically duplicates the performance of the older 6.5 Swede, using a shorter case, and higher pressures to reach the same velocity range.
More than reasonably flat shooting and mild recoiling, the 6.5x55mm Swede is the most overlooked and under appreciated of big game cartridges, in this country, at least.