Patched balls and plastic sabots will wear a barrel out with 3.2 bazillion shots.
Conicals will wear one out in 2.9 bazillion shots.
I'm not so sure about how many shots it would take to wear out a barrel or crown with each!
Why would shooting plastic sabots wear out a barrel anywhere near the same bazillion number of shots?
I would fathom that the wear ratio of loading conicals to sabots would be closer to being 10,000 sabots to 1 conical.
It's light, soft plastic verses one of the heaviest and densest of elements, lead.