Must it be a bolt action?
I've always been fond of break-open rifles.
When I decided to get back into target shooting,,,
I purchased a H&R Sportster in .22 lr.
I have been extremely happy with the rifle,,,
A lady at my range shoots 2" groups at 200 yards.
I'm not that good with it yet,,,
Cheap ammunition,,,
Older eyes.
The rifle comes in two versions,,,
The Sportster with 14.5 inch length of pull,,,
The Sportster Compact with 12 inch length of pull.
You can cheaply ($26.00) replace the rear stock as your sons get bigger,,,
I bought a shorter rear stock for when my little neighbor shoots it.
Mine retailed for $139.95 a little over a year ago,,,
Hey, I'm no expert on target shooting,,,
But this little rifle is sweet,,,
Give it a look.
http://www.hr1871.com/Firearms/Rifles/sportster.asp
Aarond