I found this quote:
Re: Anyone shoot lead bullets in their FNP 45
"I've shot lead bullets exclusively through my fnp 45 for over a year now. Well over 10,000 rounds shot during competitions and practice/plinking.
A lot of people bash lead bullets because they lead the barrel. They will only lead the barrel if you have a bad load,(too fast, bad lube, too hard of an alloy, or wrong size bullet.) 99% of the time it's due to the bullet being slightly too small. Cast bullets need to be 1-2 thousandths over groove diameter. (.452 in 45 acp in most cases) if you get a properly fit bullet with a good load, you can shoot cast bullets through any gun.
I shoot cast bullets exclusively through all of my pistols, glocks included. And a majority of all of my rifles, including my 308 30-06 and ar-15.
Properly loaded, cast bullets are more accurate, cheaper, cleaner shooting and easier on your gun than jacketed bullets.
Also, lead poisoning at indoor ranges is due primarily to the lead in the priming compound, not necessarily from lead bullets."
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& this link says conventional lands & grooves :-)
http://fnforum.net/forums/f77/cupronickel-fmj-fnx-barrels-38288.html