Why change anything ? I agree with the others that say leave it as is. There is lots of brass around at this point and you will burn less powder and get better barrel life than a 300 WSM at least in theory. I have a rem 700 sendero in 300 saum and it has been great, it shoots 150 grain bergers 180 gr accubond, partions and barnes TTSX very well. I use RL 15 for the lighter bullets and H-4350 and RL 19 for the 180's. My current hunting load is the 180 grain TTSX at pretty close to 300 win mag speeds. With this bullet seated to a LOA of 2.825 ( the max length that will fit in the mag and nowhere near the lands) am am getting three shot groups between .250 and .500 with H-4350. I am using forester bench rest dies and getting .001 or less runout at the case necks which really surprised me as this is better that i get with my 22 ppc .
