Thread: First attempt at necking down 308 to 7mm08

Success!

I re adjusted my die and deprived pin, made sure to use enough lube, resized the round, chamfered it then whacked a projectile in. It measures up the same as a loaded 7mm08.

Having the de priming pin back in correctly managed to keep the neck thinner. In any caseit appeared to work. Now I just have to figure out if it is safe to fire it chambers just fine.
Empty 308, 308 resized or 7mm08 (and loaded with a 140g Sierra game king) and a real 7mm08 with the same projectile,

It looks good and chambers so should be a go. well done you seemed to have worked hard for this result.

Originally Posted by Toby

It looks good and chambers so should be a go. well done you seemed to have worked hard for this result.

That's only because I'm a muppet Toby I should have managed this much earlier.

Next skill to add to the reloading toolkit, annealing brass.

Sweet. Just check the loaded rounds neck diameter is less than sami spec max. It should be.
Start at min book loads and work up. Extra neck tension and possiblely less case volume mean you may reach max before you used to.

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Hi,

Guy called ammosmith on youtube has a great series on changing such things. He is doing a 30-06 to a 308 but should be very similar. NB Pretty sure he commented that lake city has a heavier wall than most others.

This is the series,

Cartridge Conversion Part 1 - YouTube

Advanced Cartridge Conversion Part 1 - YouTube

Fire Forming Part 1 - YouTube

Anealing brass,

http://www.youtube.com/watch?v=kgD5D...9MKRUv7RjJB1XA

Cheers for those Steven. I'll have a watch.

I've managed to borrow a mates neck turner so I'm going to make sure the neck is uniform and the correct thickness with that.

I'm going to have to come back to trialing this later as I got a little carried away on the weekend with the 7mm08 and put about 60-80 rounds through it which dented my hunting stash a little bit.

Glad you got it sorted. May I point out that you got hung up on a issue that wasnt really ever a problem, this is very common among every new reloader... We all get fixated on things that dont exsist but we live and learn. Dont worry about neck thickness, its one of those tiny variables that beechrest shooters play with, as long as the cases chamber and you are loading to book max loads you will be fine.