assumably you will get in as close as possible and set them up to suceed.....the 7mm/08 with light load will carry more authority than 223 and give more margin for error....the softest projectiles you can get trundling along at pedestrian speed should work fine if you can do those two things.
speer spbt springs to mind.or any of the varmit type out there...the reason I say this...we did it with 7.62x39mm with speer 130grn HPS and 125grn nosler ballistic tips with great results....so same as down loading .308. red hinds at bush ranges just fell over dead with chest shots.
you COULD get a hold of trail boss...some of Roberts cast hps and make up really really tame loads,something like 6-7-8grns,the kids could plink away with them ,not much different to 22lr and a case full of TB will be supersonic but way down on other loadings but have some killing power out to hundy....at end of day,its all about making kids confident with rifle,shooting hares with soft loads and big rifle would set them up perfectly.
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