Methow Packer
Well-Known Member
If I was to rebarrel my 270wsm to a 7mm which should I choose and why. I assume I'd have to go with a 300 wsm reamer if that was the right choice etc. One has more capacity?
7mm WSM or 7mm/300 WSM or 7mm/270 WSM
- Thread starter Methow Packer
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The 7-270WSM and 7-300WSM are essentially the same thing. Most find it easier to neck up 270WSM brass. Both of them will have slightly longer necks at the expense of case capacity. If I were to build another WSM I would go with the 7-270. I believe the longer neck trumps the slightly larger case capacity. You will need a 7-270 or 7-300 WSM reamer. The 300 WSM reamer would ream the neck area to a 300 and would not work with a 7mm neck.
Have you thought about the 7 SAUM?
Jay
Jay
Methow Packer
Well-Known Member
Many thanks
Methow Packer
Well-Known Member
but why if you look at reloading books like Hornady does the 300 wsm w/150 grain bullet fly so much faster. Takes more powder it appears. I see the dimensions are the same but velocity for a similar bullet is a lot more
Are you asking why a 300 WSM is faster with a 150 than a 7 with a 150? If that is the question it is because the 300 has a larger bore and pressure will be lower so you can increase powder charge. The 7 will most likely have a higher ballistic coefficient had have less drop and wind deflection. I personally only shoot large for caliber bullets. I would NEVER shoot a 150 in a 30 cal. If you want 140-150 bullets go 6.5. If you want 180s go 7. If you want bigger(200,210,215) go 30. Then find the case to push them your desired velocity.
