MC,
I use the H mantle 173gr bullet after trying bullets from 120gr up to the 173.I recognize and accept that others are just as taken with lighter bullets( usaually the very effective 139-140gr bullets).My rifle is a combo gun and with 160-173 gr bullets, the 16 ga slugs(Brennekes)are useable with the same sighting. With much lighter bullets it shoots "high and right",so slugs are not useable.After using the H mantle on fox,roe,boar, whitetail,and red deer,I find this bullet panetrates, but is not as destructive as other bullets( partition bullets are similat)."You pays your money and takes your choice", as someone once said.
John can.
I don't consider your Brno a lower end rifle, at all.
Mike