It's a matter of the rifling's effect on the lead, not velocity.

Now, I'm not going to give you an answer one way or the other. I've never tried running lead down a polygonal-rifled barrel. The Glock 30 I load for has an aftermarket barrel, and my 26 has seen nothing but plated (which works well). Some people report no problems, some say you just need to do a lot of cleaning, and some claim catastrophic failure. Whatever--an aftermarket barrel on my 26 would take too long to pay itself off given what I can buy plated for.

I found great success in the faster powders, loaded to perhaps midrange in the 124-125 gr weight (plated). Bullseye worked well, as does 700-X. I had excellent results using AA #2--respectable 25-yard groups.