Extra brass prep necking down 6.5 creedmoor to 6?

[Tsu45]

Does necking down from 6.5 to 6 result any additional brass prep? Turning necks, trimming, etc.?

 

[ShootDots]

Generally, going down 1/2 millimeter will result in the necks thickening about 2 thousandths! This will necessitate neck turning. Additionally, necking down leaves a "bulge" at the neck / shoulder junction. Unless you turn it off, it will become a doughnut inside the case! Necking down is a bit of a chore>>>>the further you neck down the bigger the pain and the more the work. From 6.5 to 6mm is not that bad BUT it will require neck turning.
NOTE: If you are reluctant to go thru the processes, give DJ's Brass Service a call! He will fix you up correctly and he is on this forum!

 

[strat81]

Why neck down when quality 6mm Creedmoor brass is available?

 

[SealT5]

My thoughts as well. To answer your questions. I suggest to have the mentality that you may have to deal with the issues above. But they are not for certain. I personally have not seen issues necking down Lapua brass from 6.5-6mm or 6mm-22.

I highly suggest going with manufactured 6CM brass

Joe S.

Why neck down when quality 6mm Creedmoor brass is available?

 

[Tsu45]

My thoughts as well. To answer your questions. I suggest to have the mentality that you may have to deal with the issues above. But they are not for certain. I personally have not seen issues necking down Lapua brass from 6.5-6mm or 6mm-22.

I highly suggest going with manufactured 6CM brass

Joe S.

Only reason being I have 400pcs of virgin 6.5. Just a pain to take a bath on selling them and then turn around and buy 400 in 6 at full retail.

I run all new brass through a sizing die before I load it, so no real extra effort to neck down unless other prep is then required.

 

[spudgun]

Only reason being I have 400pcs of virgin 6.5. Just a pain to take a bath on selling them and then turn around and buy 400 in 6 at full retail.

I run all new brass through a sizing die before I load it, so no real extra effort to neck down unless other prep is then required.

I did the same as you. I shoot 6.5 CM and building a 6mm CM. Have 200 virgin cases of 6.5 CM, Starline small primer.

I necked them down but will turn the necks once my trimmer dies arrives.

Don't think I will run into issues chambering or seating bullets.

 

[Brians356]

I did the same as you. I shoot 6.5 CM and building a 6mm CM. Have 200 virgin cases of 6.5 CM, ...
I necked them down but will turn the necks once my trimmer dies arrives.

What are "trimmer dies"? (I have some old school trim dies, but I suspect you refer to something else.)
-

 

[Brians356]

Only reason being I have 400pcs of virgin 6.5. Just a pain to take a bath on selling them and then turn around and buy 400 in 6 at full retail.

You might list them "Trade for 6 CM" in the classifieds. Worth a try.
-

 

[spudgun]

What are "trimmer dies"? (I have some old school trim dies, but I suspect you refer to something else.)
-

Trimming the outside of the neck area to get even tension on the bullet.

 

[nmkid]

The downsizing you are asking about is a piece of cake. So what if you have to turn the necks! I would suggest doing the whole process on 100 of your cases, decide on the results based on if you think it was worth it or not.

 

[Brians356]

Trimming the outside of the neck area to get even tension on the bullet.

There's a "die" for doing that? Pray tell, please: Where can I get one?
-

 

[Brians356]

Generally, going down 1/2 millimeter will result in the necks thickening about 2 thousandths! This will necessitate neck turning.

Not necessarily. Two thousandths is a little high. I've necked 7x57 down to 257 Rob which is close to 3/4 mm reduction and neck walls thickened about 2 thou. I'd estimate about 0.0015 thicker from 6.5 to 6mm. If it's a SAAMI chamber neck turning won't be absolutely necessary, but I'd turn necks anyway for consistency and to reduce neck tension.
-

 

[jamesh]

If you have a S.A.A.M.I. 6mm Creedmoor chamber you don't need to turn necks unless you want to for consistent neck thickness.