[jack404]

main thing is centre balance

i cut the nose off new projectiles and counter sink em for a pig's blood , salt and gelatine mix

i use a lathe with a centre drill and cut off tool

zing, burrr, done, do the next one

the shoulder of the jacket takes all the wear of friction ,

i think they guy was trying hard to sell stuff

i have seen home made jacketed rounds do what you stated , theres a youtube of one

but a manufactured projectile is as good as it gets

never heard of it doing that unless there was pitting in the bore before it was fired

pitting in the bore can strip or partially strip jackets and bulge barrels and make blockages

but thats the pitting doing that ...