The Aguila SSS round is long like the .223 with plenty of lead to grip the barrel.
1/7 I believe is standard .22 target rifling so the 1/9 should keep
the SSS round accurate even with the low velocity. I have no personal
field testing on the accuracy and can only go by my experience in
the range at 25 yards.
Maybe soon I'll have a chance to get outdoors for testing.
/Salute