RE: 150 grain round nose in .270?
I know plenty of guys use them and I have used them myself. They work and in some cases better than spitzer bullets. Unless you just have the need for some nostalgic ammo there really isn't a reason these days for shooting them...esspecially in the eastern half of the country.
Typewriters work......computers work better.
round nose bullets work....in most cases for medium game, spitzers work better.
Good luck and your best bet for finding them is in bulk from places like Midway or MidSouth.