Originally Posted by rem300ultra
What bearpaw said. 180 in 300 ultra will do the job.
180gr will get the job done with either. Between the two the 7mm 180 though is going to have the higher sectional density.
The .308's won't have a higher SD till you get up to the 210gr wieght range.
The advantage the Rum gives in this case is more potential energy and higher BC's with the heavier Bullets.