here's a good source to check out.... a guy who has combined load data from a bunch of sources into something comprehensive...
the page on the 243 and load data with the 60 grain bullets
http://stevespages.com/243_2_60.htmlIf you are using it for your child... I like to load those with 30 grains of RL 7 or 4198.. makes a nice low recoil/retort load, that is still quite effective for varmints within 250 yds or so...
those 60 grain Sierra HPs are ALWAYS a very accurate bullet and one of my favorite... that and the 65 grain V Max are two of my favorite lightweight 6 mm bullets for the 243...