HYD ROLLER CAM Regrinds

I bought a Hughes regrind years ago and it was 214/216 w .510 valve lift. - worked great.

This ebay seller has regrinds w 228* @ 0.050” w 1.5 rocker .525” valve lift -

I was just wondering how much can you regrind a cam?
Regrinding a stock cam,
You don’t have a lot to work with.
That's just not true. A cam grinder can put that lobe wherever he wants on the core.