My experience is with the 130gr Speer in a 7 M/M 08. this was with a new Douglas barrel during load development and accuracy testing on a 1909 Peruvian Mauser Action, these loads are not maximum, they were for a new teenage hunters use.
xx grains of H380 with 130 grain speer group size .936 Velocity 2710.
xx grains of H380 with 130 grain speer group size .719 Velocity 2770.
My experience is that in the fast twist 7 M/M barrels the 145 grain Speer is a little more accurate.
xx grains H380 with 145 grain speer velocity 2704 group size .466
xx grains H380 with 145 grain speer velocity 2620 group size .616
This rile is a solid 1/2 rifle with the 145 grain and right at 3/4 inch with the 120 grain.