.30-06 & .270 brass resized to .308 question.

alloy · December 9, 2010, 07:05 PM

I noticed Garand and M1A use the same extractor. I am guessing the brass will work in that instance, but I'm wondering if there may be other rifles that might not function with the smaller extractor groove in the resized brass.

Any particular reason for the different groove that you know of, in .308/.243/7MM-08 that would lead to to believe .30-06/.270 etc brass wouldn't function?

Thanks.

cornbush · December 9, 2010, 08:23 PM

The bigger groove is for more positive extraction when run through machine guns.

alloy · December 9, 2010, 09:00 PM

I guess that means some .308 extractors might be designed around that groove and may not accept the .30-06's smaller groove.

That might be the end of that.

**44 AMP** · December 10, 2010, 12:29 PM

I have some .270 & .30-06 brass formed into .308 Win. ALways worked in my bolt guns, and in the semi (M1A) that I used it in.

Can't say for sure about any other guns, but I would expect it to work in them, also.

HiBC · December 10, 2010, 03:50 PM

Wildcaters have reformed cases in all directions and it can be done.
I don't understand why anyone would want to work that hard for a 308 case.
You will likely thicken the necks,requiring reaming or turning.
You could have Norma,Lapua,or any premium .308 brass easir by buying it.

Clark · December 12, 2010, 04:11 PM

The 308 family has a .055 - .065" long groove, .044" - .054" thick rim.
The 30-06 family has a .033 - .043" long groove, .039" -.049" thick rim.

Both families have groove diameters .389" - .409"

wncchester · December 12, 2010, 07:01 PM

We can reform any common head cartridges as we wish, the extractor groove won't matter in civilian rifles.

Reforming is quite easy and it can certainly produce better than normal cases, many more reasons to do it than economy but that works too. It's certainly easier to buy new cases but then it's also easier to buy factory ammo than it is to reload. ??

December 9, 2010, 08:23 PM	#2
cornbush Senior Member Join Date: September 29, 2008 Location: The retarded place below Idaho Posts: 1,356	The bigger groove is for more positive extraction when run through machine guns. __________________ The best shot I ever made was an accident

December 10, 2010, 12:29 PM	#4
44 AMP Staff Join Date: March 11, 2006 Location: Upper US Posts: 9,041	I have some .270 & .30-06 brass formed into .308 Win. ALways worked in my bolt guns, and in the semi (M1A) that I used it in. Can't say for sure about any other guns, but I would expect it to work in them, also. __________________ All else being equal (and it almost never is) bigger bullets tend to work better.

December 10, 2010, 03:50 PM	#5
HiBC Senior Member Join Date: November 13, 2006 Posts: 3,053	Wildcaters have reformed cases in all directions and it can be done. I don't understand why anyone would want to work that hard for a 308 case. You will likely thicken the necks,requiring reaming or turning. You could have Norma,Lapua,or any premium .308 brass easir by buying it.

December 12, 2010, 04:11 PM	#6
Clark Senior Member Join Date: December 4, 1999 Location: WA, the ever blue state Posts: 2,016	The 308 family has a .055 - .065" long groove, .044" - .054" thick rim. The 30-06 family has a .033 - .043" long groove, .039" -.049" thick rim. Both families have groove diameters .389" - .409"

December 12, 2010, 07:01 PM	#7
wncchester Senior Member Join Date: December 1, 2002 Posts: 2,705	We can reform any common head cartridges as we wish, the extractor groove won't matter in civilian rifles. Reforming is quite easy and it can certainly produce better than normal cases, many more reasons to do it than economy but that works too. It's certainly easier to buy new cases but then it's also easier to buy factory ammo than it is to reload. ??