I own a 7mm STW.
I have thought about doing a &mm Ultar instead of a 7m WSM.
The wsm and the 7mm caliber would be or possibly is bordering on an overbore cartridge.
In order to gain the full potential of the 7mm WSm
you will need a longer barrel possibly no less than 28 being the bottom line and 30 being a good compromise.
My 7MM stw with the 180 gr Bergers and behind 74.5 grs of H1000 pushes it to 3100.
These Bergers like to be pushed fast almost to the point of disinegration in my rifle.
I have a 34 in Lilja 4 groove barrel.
This could be the reason why they need to be pushed faster in my gun.
One great advantage of the WSM case is no belt and shorter powder column.
One day I will rechamber it to the 7mm Tomahawk (300 Tomahawk necked down) and increase barrel length to 36 inches with a 1:9.5 twist.
I have yet to get to the range for testing of the LRBT 162 gr 7mm bullet, or Sierra's 168 MK or JLK's 168 gr bullet either.
Just my two cents, please all who read lets hear your comments.