Hey guys, I am getting ready to start collecting parts for a new long rang Pdog rifle. I will be building this rifle for shooting dogs out to 1500 to 1700 yards. What cartridge would you recommend. I like the 7RUM because it gives me many choices on excellent VLD type bullets from 162 A-Max to the 180grn Berger. The 7RUM can push the 180grn bullet with a BC of .684 out of a 30" tube at around 3350fps. How does that bullet and velocity compare to a the 338 Lapua Mag pushing the 300grn Matchking at around 2950fps. What do you guys think. I know the Lapua brass is better, but what cartridge and bullet combo will be more deadly out to 1500 yards. From what I can see, the 7RUM with the 180grn VLD at 3350fps has better ballistics than 338 LM with the 300grn MK out to 1500 yards, less drop and windage. Please, give me some info so I can make the correct choice.