I have a 6mm Remington, that I use, also had a .243, much prefer the 6mm Remington, bit faster, but found it far easier, to get several, projectiles to similar point of impact,
65gr v-max, and a hunting load of 85 gr partion, both have same point of impact at 200m,
very good with 87gr, Hornardy BTHP.
65gr v-max is pushing to 3850fps plus, and turns, gophers, rabbits, hares and coyotes, to paddock fertilizer.![]()
I also had a couple of 22-250, love that cal, but the mid size 6mm bore, is far more flexible and versatile, on a wider range of game, and has multiple bullets from each manufacture, suitable for small and med game.
right on to the 6.5 cals,
I have two, a .260 and a .264 win, haven't really used either for varmints much, but have used both, for predator hunting, when I lived in Canada, both with the 120gr ballistic tip,
Too expensive, not as many choices, of light weight varmint bullets, more a med game cal, with the odd bullet option for small game, bullets are more expensive the bigger the bore.
The .264 win has sum serious long legs, with a 120gr ballistic tip at full throttle, forget speed, but 3500plus I think. dusted a few coyotes at over 500m.
Couple other points, the bigger the cartridge, the more recoil, one you get into 6mm and 6.5 you cant spot your shots, in the scope, for pure varminting the fast .17 and .20 cal centerfires are much more fun.
I see you have left out the 1/4 bores, ..25cal's, despite the horseshit you here on here about shit BC bullets, both the 257 Roberts and 2506, are very capable, out further than the 6mm bores, and before everyone chimes in, the light weight 85-100gr .25 bullets have as good or better bc light for cal bullets that the 6mm bore does,
I have used or own .17 hornet, 17 fireball, .204, .22 hornet, .221 fireball .222, .223, .22-250, .243, 6mm rem, .2506, 257 wby. .260, .264 win,
for pure varminting I would take the .17 fireball first,or .222,
For varminting and the odd deer, fast twist 22-250 or 6mm Remington,![]()
For a deer rifle with the odd day of low volume bunny busting, .260 or 2506,
For Pure DRT there big or small, nothing can come close, too a full throttle load form a .257 wbyor .264 win,
and a 100gr, Ballistic tip, low volume shooting due to very! short barrel life.
Honorable mention to 300H&H and 9.3x62, but both are just a little bit overkill on rabbits and too expensive to run, very effective thought.
Have fun.
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