Originally Posted by MudRunner2005
Yes, I know you can neck-down .300 RUM brass. It wasn't my rifle, it was my buddy's rifle. Complain to him about his way of thinking.
The 7RM and 7STW are within 150fps of each other...I'd say that's not too far off ballistically.
Mud, not complaining at all just stating facts. I don't want to turn this into an argument, but you cannot have your cake and eat it too. You KNOW that ballistically the 7 RUM pushes more than 20fps faster than the STW. It is more like 100+ fps. So 150fps for the 7 mag to 7 stw and 100+fps for the stw to the rum. Powder difference is right around 10-12 grains more for the mag to the stw and the stw to the rum.
So, with all the facts out there, unless the 7 mag and 7 stw are 'ballistically equal,' than the stw and the rum are not either. That is all I am saying...
To the OP, you already have 2 great guns in the .308 and the .338 Lapua. You are right on track with something that could fit in between there, the 7 mag, wsm, stw, or rum or you could look at the 300 win or rum. Any of those will fill the gap nicely. Just depends on what, exactly, you are looking for and only you will be able to decide there. Every single one of those rounds has it's positives and negatives.