ever use a 7mm08 case for 308? - The Firearms Forum

cycloneman · 03-15-2012, 10:07 PM

just wondering if anyone has every done this. The cases are pretty close. The 7mm would have to be cut down to spec if this is possible. then i guess the concern is for the thinning of the neck wall.

Alpo · 03-15-2012, 11:50 PM

Not 7mm/08, but I've "upsized" 243s and used them. Not a problem.

gdmoody · 03-16-2012, 06:37 AM

NO, but I have used a .270 case for 30.06, just to see if I could,

cpttango30 · 03-16-2012, 08:16 AM

YOU tend to get a more uniform neck tension. Because of the expander ball drawing the smaller neck to the larger size.

JLA · 03-16-2012, 08:26 PM

Yep. Cpt. beat me to it. Thats somewhat of an unspoken benchrest shooters technique.

A 7/08 run thru a .308 die and trimmed to spec and fireformed then necksized would have better neck tension than a .308 case necksized, and you prolly wouldnt have to turn the neck either.

1 Eyed Jack · 03-16-2012, 08:34 PM

OK, it's not unusual for me to be confused, but I thought a 7mm/08 was a wildcat starting with a .308 and necked down to .284(7mm), not sure if the shoulder position/angle is also changed,

03-15-2012, 10:07 PM	#1
cycloneman Advanced Senior Member Join Date: Dec 2008 Location: Louisiana Posts: 7,401	ever use a 7mm08 case for 308? just wondering if anyone has every done this. The cases are pretty close. The 7mm would have to be cut down to spec if this is possible. then i guess the concern is for the thinning of the neck wall. __________________ Who are you going to serve today? -->

03-15-2012, 11:50 PM	#2
Alpo Advanced Senior Member Join Date: Feb 2007 Location: NW Florida Posts: 8,655	Re: ever use a 7mm08 case for 308? Not 7mm/08, but I've "upsized" 243s and used them. Not a problem. __________________ Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297 I always take precautions. Beware the Evil Bullet Fairies.

03-16-2012, 06:37 AM	#3
gdmoody Advanced Senior Member Join Date: Sep 2007 Location: Northeast Georgia Contributor Posts: 6,319	Re: ever use a 7mm08 case for 308? NO, but I have used a .270 case for 30.06, just to see if I could, __________________ NRA Endowment Member GeorgiaCarry.Org Member Retired US Army Postal Worker Personally, I carry a gun because I'm too young to die and too old to take an ass whoopin'.....author unknown (but obviously brilliant)

03-16-2012, 08:16 AM	#4
cpttango30 Former Guest Join Date: Jul 2011 Location: Stafford, VA Contributor Posts: 3,071	Re: ever use a 7mm08 case for 308? YOU tend to get a more uniform neck tension. Because of the expander ball drawing the smaller neck to the larger size.

03-16-2012, 08:26 PM	#5
JLA TFF Moderator/Host Join Date: Feb 2007 Location: Heart Of Texas Contributor Posts: 17,308	Re: ever use a 7mm08 case for 308? Yep. Cpt. beat me to it. Thats somewhat of an unspoken benchrest shooters technique. A 7/08 run thru a .308 die and trimmed to spec and fireformed then necksized would have better neck tension than a .308 case necksized, and you prolly wouldnt have to turn the neck either. __________________ It takes 43 muscles to frown, 17 to smile, and 3 for proper trigger squeeze. The latest caliber or gear is no substitute for experience and skill. Rifles and cartridges don't make hits -- shooters do. Fact of life: After Monday and Tuesday, even the calendar says WTF!

03-16-2012, 08:34 PM	#6
1 Eyed Jack Senior Member Join Date: Aug 2011 Posts: 673	Re: ever use a 7mm08 case for 308? OK, it's not unusual for me to be confused, but I thought a 7mm/08 was a wildcat starting with a .308 and necked down to .284(7mm), not sure if the shoulder position/angle is also changed,