I bought a box of 180 grain nosler partition PP's online from Midway USA last week. I thought I was buying the regular Spitzer bullets and didn't notice the PP next to the order code. I've looked at Nosler's website looking for more information about what I bought. I see that the B/C for these bullets are less than the spitzers but that is all I see. Does anyone use these? Can anyone explain to me what the difference between these and the spitzers are other than the tip? Thanks!