Homer Pearson designed a great junior rifle, and Anschutz did us a great service by agreeing to manufacture it. But at 9lbs it's too heavy for the prime target audience of 13-year-old beginners, over half of whom are female. Too much weight causes needless pain, strain and frustration trying to master it from a starting position of zero experience.
The problem is, it's your only viable choice in a new rifle, as there are a number of "junior" rifles out there but they all have major shortcomings, not the least of which is within six months your most talented students will be able to hold tighter than the lesser rifles will shoot. More recipes for frustration and quitting.
The good news is that after six or more months of twice-weekly work, most youngsters will have progressed physically to comfortably handle 9 pounds of rifle in all four positions. What you need in the interim is a starter rifle that has all the right features they won't quickly outshoot. The ideal rifles for this are the older Anschutz Achiever at 6 pounds for little kids, and the Anschutz Match 64 at 7lbs for teenagers. You'll probably have to cut the stock of the adult-sized Match 64 to fit. The Match 64 is enough rifle that with one, you won't need the Homer Pearson rifle at all, and after a year or two of experience and strengthening can progress straight to a more sophisticated adult target rifle like the 1907, the 1913 or 2013 with 500mm barrel and bloop tube or the KK300-500.
Also keep in mind you're about to launch your 4H youngsters against probably the most difficult target in all of shooting, the .4-inch 10-ring 50m International target, and it takes an excellent rifle-ammo combo to make cleaning that target even possible.
Achievers are hard to find, but there are a lot of Match 64's out there in the $600 range.
http://www.gunbroker.com/item/649200132
http://www.gunbroker.com/item/651018036
https://www.gunsamerica.com/980900840/Anschutz-Savage-Match-64-22LR.htm
https://www.gunsamerica.com/928444200/Savage-Anschutz-model-64-22-caliber-Bolt-Action.htm