I don't think you need worry about over driving the 130 grain bullets. The 270 WSM is just not much above the 270 Win. I have both sitting here beside my dest. With the top load of IMR 4350, I get 2900 from the 270 Win and just over 3000 from the 270 WSM. The 270 Win has a 4 inch shorter barrel at 22 inche where my WSM has a 26 inch barrel. The manuals says my load should be 3200 fps but as usuall their readings are hard to reach with hunting rifles.

I could try a slower powder and increase the velocity some but this load shoots 1/2 inch at 100 yards so why bother?

WW factory loads are another story. I get 3250 from the 130 Ballistic Silvertips and just under 3200 with the WW 150 Power Points. I often shoot Federal Fusions in the 270 Win. These are 130 grain and they clock 2860-2875. However its lights out for anything they hit. I plan on tryuing the 150 Grain Fusions in the 270 WSM. They claim they make it 130 but I have never found any. The SD of the 130 grain 277 bullet will keep it together well even at 270 Weatherby velocities.