johnd.......Ive thought long and hard about how best to answer that as your point does have merit. where dual loading really shines is that it gives you great results at BOTH ends of preformance spectrum VS really good in middle and just ok at each end.
eg the barnes or partition load is very good for deer/pigs as you can safely shoulder shoot all but the biggest of beasties at the sub 150 yard range we talking,all my deer are chest/shoulder shots and they go down pretty darn quickly.
the soft varmit type loads (softest Ive used are hornady SPSX and speer) give you margin for error on smaller critters eg Ive shot rabbits with .30/30 and had to run them down as zero expansion,or rabbit shot through eyes with .222 with hardr load again zero expansion so didnt die where as a softer load would have given major shock if not decapitation,similarly you shoot small game and wind drift/movement/pushing range causes a 3" error of aim and you hit small animal in guts or arse end with a mid-hard projectile and it will crawl away to suffer as projectile wont do enough damage to kill it out right,hit it with a soft pill and it wont go anywhere...this isnt new concept,its talked about in my first edition Nosler manual when shooting groundhogs with super accurate match bullet isnt as good as a softer not quite as accurate one for same reasons.
the 50 grain speer flat base hollow point is a great wee pill that shoots accurately in my .223 at about the 3000fps mark (light loads suit me) the 110lb boar that popped up at 30 yards copped one in the swede and didnt care less as was D.O.A. they soft enough to be great on wallabies but for dedicated rabbit/hare load I would have to go with TNT or VMax they also have bonus of reduced chance of richocette as they blow up/fly to bits on impact.
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