Back in the 80s at Daystate they used .22 bullet heads on the higher power pcps (30ft lbs +) because the pellets of the day couldn't handle the power.
Splitting in half??? Or just inaccurate?
"corners should be round" Theo Evo .22/.177 - Meopta 6x42, DS huntsman classic .20 vortex razor LH 3-15x42 under supervised boingrati tuning by Tony L & Tinbum, HW77 forest green - Nikon prostaff 2-7x32 plex.