Thread: New to reloading - need to Check my thinking

I'm brand new to reloading and I don't have a sounding board for it in real life, so I thought it best to ask here.

I'm looking to work up a load using:
PPU brass cases
Sierra Gamechanger 90gr 6mm projectiles
CCI primers
ADI 2208 (between 34 -36.5 Grains) (44800- 50400CUP) (as per ADI 10th edition manual)

What concerns me is the powder charge listed in the manual is for the 90gr Speer Soft point. A very different projectile.
Now I don't personally see any harm in just buying some Speer Soft point and using those. But it would be nice to use what I already have.
I suppose, what I am asking is, to what degree is powder charge influenced by bullet shape/style versus projectile weight? If at all