Shawn, How old is your pond?
If new and with no adult LMB, 4 inch HSB are adequate size.

If you have adult LMB, predation is a common problem.
4 inch HSB become expensive fish food.

HSB over-winter very well in our ponds and continue to feed all winter, although at a slower pace.

A minimum of 8 –10 inch HSB stockers is recommended for stocking ponds with adult LMB.

Take my comments as personal opinion only - I’ve made every HSB stocking mistake in the book

Todd Overton and Bruce Condello are the HSB experts and sure they will chime in.
Good luck with your HSB – they are a great sport fish and excellent table food as well.