The rimfire ( smallbore ) lever action targets are 1/2 size. ( 50%, I do know )
The scoped rifle smallbore targets are 1/5 size. I've spent over 20 years shooting at them, I know how small they are.
Not trying to rain on your parade, you are trying something different, good luck to you.
If it wasn't a 14 hr drive, I'd come along.
I just gave you another silhouette shoot to look at for interest sake.
The .22bpcr targets are scaled to distance: % of full size targets
chickens @ 50m are 25% ( 50/200 ) shot standing, off-hand.
pigs @ 100m are 33% ( 100/300 )
Turkeys " 150m are 38% ( 150/385 )
Rams @ 200m are 40% ( 200/500 )
It is an enjoyable, challenging event that is well patronized in the U.S.
Here in Australia, we shoot it but using the 1/2 size targets that you are using, mainly because the existing silhouette ranges already have them.