I have a 300 win mag i shoot 180gr noslers with IMR 4350 at 68gr. I would like to make my 7mm mag as close to the same as possible both are remingtons sendero.Thanks for any help guys.

AAdams
If you mean as close as possible power wise I would use 175 grain bullets in the 7 Mag. Since you said both are Sendero's , which indicates to me you might mean as close as possible in trajectory for long range shooting, I would go with a 160 gr in the 7 Mag. What game are you intending to hunt?
I have hunted with a 7 Mag and 300 Mags.

I am hunting whitetails but i have hogs on the property too.I will be using these two guns in the woods.Later in the year i will be using my 7mm stw sendero for the long stuff.