The 185g Controlled Fracturing was tested using 50g of Blackhorn powder, and also 80g of Blackhorn powder. In both tests, the performance of the bullet was superlative. Here is a link to the 50g Blackhorn test, followed by a link to the 80g powder test. This might be the bullet i would have my grand daughter shoot, using a small powder charge, because one can know for sure it will work as designed at any speed. Recoil should be quite manageable for a small child.

Keep in mind more bullets failed to work in this test, than succeeded, when the powder charge was only 50g, at only 25 yard.