sideshowbob
Member
- Joined
- Jul 24, 2010
- Messages
- 18
The reason people are necking the 270 or 300 WSM brass to 7mm is because both of those are way more available than the straight 7mm WSM, the dimensions are different on the 7mm WSM to prevent it being chambered in the 270 WSM. 7mm WSM can be formed from the other two, but it is a bit more work to do than just necking the other two to 7mm. The 7mm WSM has a higher capacity than the other two variants because of the shoulder being pushed forward (which also prevents chambering in the 270 WSM).
They are great rounds, but the dimension changes have pretty much doomed the straight up 7mm WSM unless a brass manufacturer decides to bring it back
I think you are missing the point of the above post. At least one poster says that the 7-300WSM has more case capacity than the 7mm WSM or is better than the 7mm WSM, and is therefore a different chambering altogether.