Im not "wanting" for a small caliber... I just always wanted a 6mm Rem.
My small 25 is a 25/45 think light 250 Savage in a AR. Shoots very well but heavy. Fine if ya dont walk or need to walk far. 110g Hornadys are closing on 2700 and have been devastating on deer the 90g Sierra also worked well on deer and coyotes. 87's didnt shoot well? 117 RN can be moved to 2450fps and are also accurate. Might be a excellent 1-150y freezer filler.
My 6.5 Grendel is another favorite this one is a HOWA Bolt and it is also very accurate. 85g are reliable shooters and probably very good on small critters. The 120/123g have been great on deer. Gold Dots and Sierra Pro Hunters plop boringly into a dime at 100.
Both of those will do about anything a 6mm would do for me. Somehow that dont really matter when ya have a want.
Love the stories and always advice. Keep it coming guys!