Originally Posted by taylorce1
Originally Posted by MickinColo
Not a lot of difference in case design.

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I knew that when I asked the question. I imagine Winchester thought it was better to change the case slightly and rename it, than change the WSM to a faster twist. I can only imagine the unhappy customers when the new bullets wouldn't shoot in their old rifles.

I think the bigger reason they did a new cartridge is because they realized the case was too long. The m70 mag box may allow an OAL to accommodate it, but few others do.

Don't speculate when you don't know, and don't second guess when you do.