Resizing a case to a different caliber??

[Crashman]

Hey guys I need a little help here. I just picked up a 7mm-08 and I have a ton (quite literally) of 308 brass. How do I resize this brass to work in my new rifle? I think I understand the process of just running the brass into the 7mm full length resizer, but what about case neck wall thickness? Will I need to ream the neck? If I do, what is the best way/equipment to do this? OR, am I better off to just buy a couople hundred pieces of 7mm-08 brass and skip this process altogether?

Thanks!

 

[Levi Garrett]

Run the .308 brass through the 7mm08 die , check length, trim if required.
A bit of lee dry lube inside the case neck(q-tip) before sizing. Then just prep like normal 7 mil brass

 

[tiriaq]

Measure neck diameter over a seated bullet. This will tell you if any neck turning or reaming might be necessary.

 

[downwindtracker2]

A good idea would be to mark the new 7mm-08 brass with felt tip in the extractor groove,you really don't want to shoot a real 308 in your 7mm-08.

 

[sunray]

You very likely will have to ream and turn the necks.

 

[chappy]

i have never had to turn the necks on 308 brass. most factory chambers are quite generously sized. the 308 brass will be a little shorter than 7 08 but after a couple of firing it will be good. if you have a 308 try to use a different manufacturer for your 7 08 brass then its easy to sort. i ued lapua for 308 and hornady for 7 08, no mix ups.

 

[savagefan]

no reaming or turning required, binderdoindat. The diff in bullet diameter is only 0.62 mm. on the initial resize if you're doing a large batch you may wanna eat breakfast first.

 

[Levi Garrett]

A good idea would be to mark the new 7mm-08 brass with felt tip in the extractor groove,you really don't want to shoot a real 308 in your 7mm-08.

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