270win was originally made from 3006 cases. That much I know already. So I thought I could use some of my old once fired 3006 cases in my 270win, just for plinking, once, and then throw the case away. Is anyone doing this? Any problems in that?

Any contribution is wellcomed
Niels

Not a problem. I've necked 308's down to 243 before. You just get a thicker neck which will probably help the accuracy since the factory chambers are usually cut so big. Make sure that the neck is not too thick and shoot away.

Might want to use them more than once, they might shoot better the second loading.

Just a little warning...if you use military brass for the 30-06 in your 270 reduce the starting loads quite a bit....they are typically heavier and have less combustion room.

I have been doing it for years.


The question is does it create premature

Throat erosion??


My speer loading manual #1 says it does

I never noticed and continue the practice...


Don

quote:

Originally posted by cal30 1906:
I have been doing it for years.


The question is does it create premature

Throat erosion??


My speer loading manual #1 says it does

I never noticed and continue the practice...


Don

Hmm... Did the manual say why that should cause throat erosion?

Excessive case neck thickness can cause excessive pressure if it crimps the bullet when chambered.

This is unlikely going from .308 to .277 but it is a concern that should be addressed for safety.

Your formed .270's will be slightly short, since the '06 is very slightly shorter than the .270 (2.495" vs. 2.54"). This is of minimal consequence because the '06 case will be very slightly lengthened when squeezed down to .277 and the expander button pulled back through the neck, so it will end up just about the "trim to" length for a .270.

Your necks will also be a tad thicker, but as mentioned early, few .270 chambers do not benefit from a thicker neck. If yours is a rare tight chamber, you might need to turn the necks, but it is doubtful. DO chamfer the insides of the necks to assure seating the bullets without shaving jacket material.

The great advantage of forming .270 from '06 brass is that you can control the placement of the shoulder. Screw your FL die into the press just to the point that the resized brass chambers with a tiny bit of resistance felt as you turn down the bolt. This will mean that your headspace is perfectly adjusted for your chamber and will mean minimum case stretching and maximum case life. This is especially useful if you have a chamber that is slightly long (the dreaded and typically misunderstood "excessive headspace").

I necked a bunch of my old 30-06 brass down to 25-06 without a problem. I necked down and them trimmed them before loading.