243 win reformmed to 7mm-08

stillquietvoice · January 28, 2016, 07:16 PM

ive never reformmed brass before can any one guide me through the process of making 7mm-08 from 243 or 308 cases.thank you in advance for your help.

Ifishsum · January 28, 2016, 09:30 PM

For .308 cases I just lube (I use Imperial) and run them through the 7-08 die, no special steps. I don't recall if I've actually tried .243 cases but I would lube the inside of the case neck fairly generously. I'd want a stem sizer with a nice gradual teardrop shape to try it. Seems like the neck might be a little thin though

stillquietvoice · January 28, 2016, 09:58 PM

with the 243 being longer make 7mm case too ling and require trimming.

Doyle · January 28, 2016, 10:20 PM

If the fired .243 cases will fit into your chamber, then you can also fireform them to 7mm-08. Google "Cream of wheat method".

Mobuck · January 30, 2016, 09:27 PM

WHY????????
7mm08 cases are available

Clark · January 30, 2016, 10:13 PM

I think that 308 cases can be necked down to 260 if ~~10% with the necks too thick are culled.
I think 7mm-08 works well for necking down to 260.
I think that necking 308 down to 243 without neck turning is a bad idea.

From this we can guess that 7mm-08 is not the best for necking to 243.

You gotta watch out for neck pinching.
The SAAMI chambers are big and sloppy, but not THAT sloppy.

stillquietvoice · January 30, 2016, 10:45 PM

mobuck the reason why is in my area 7mm-08 cases loaded rounds are hard to find. the gander mountain recently set some space up for reloading. supplies are limited town will not allow them to sell powder or primers, they carry some dies not 7mm-08 no shell holders and a small selection of projectiles again nothing in 7mm. there are a few places i can obtain cimponants but cases are still an issue and have to go out of state to aquire.
the shop in ne pa even has some problems with getting some components. it wasnt like this 30 plus years ago .
also my supply of both 06 and 308 cases developed corrosion and had to be scrapped .

stillquietvoice · January 30, 2016, 10:51 PM

i tried to resize 243 to 7mm to check neck thickness it measured .308". fish in post 2 said neck might be too thin i believe he was right just had to be sure.

James K · January 31, 2016, 12:07 AM

Note what Clark said about " if ~~10% with the necks too thick are culled." That is true any time a case is necked down any significant amount. The case neck thickens and there may not be enough room at the chamber neck for case neck expansion. That can raise pressures enough to be dangerous.

The cases don't have to be discarded, just neck turned or reamed as necessary.

Jim

F. Guffey · January 31, 2016, 07:58 AM

Quote:

Note what Clark said about " if ~~10% with the necks too thick are culled." That is true any time a case is necked down any significant amount. The case neck thickens and there may not be enough room at the chamber neck for case neck expansion. That can raise pressures enough to be dangerous.

The cases don't have to be discarded, just neck turned or reamed as necessary.

I noted what Clark said. I measure before and again after. I form cases, I also neck cases up and I neck cases down. Then come the thicker and or thinner thing with the necks. When I measure before and again after I find the necks get shorter and or longer.

My case necks get shorter and or longer; does that mean they also get thicker and or thinner?

F. Guffey

NHSHOOTER · January 31, 2016, 08:27 AM

Just now checked cabela's, they have 7-08 brass, PPU PRVI Partizan Rifle Brass – 100 $53.99 per 100..not the best but much better than trying to resize 243 brass and they have hornady brass for your 7-08 for 31 bucks for 50..

Mobuck · January 31, 2016, 09:10 AM

"mobuck the reason why is in my area 7mm-08 cases loaded rounds are hard to find"

I've owned a 7mm08 for about 10 years and accumulated a sizable stock of brass buying once fired on the internet(100-200 at a time). In fact, I seldom buy brass or ammo locally.

stillquietvoice · January 31, 2016, 10:22 AM

gander here has 308 i believe lc 250 for 80.00. just got 7mm -08. what tool is needed to turn necks for consistant diameters.

tobnpr · January 31, 2016, 11:51 AM

I have no idea why you don't want to make more work out of this than necessary, but here you go...
There are hand trimmers as well, and precision ones for competition shooters in the hundreds of $$. In addition to those above,Graf's has 7-08 brass...and I use Prvi and have never had an issue or complaint.

http://www.midwayusa.com/product/622...k-turning-tool

January 28, 2016, 07:16 PM	#1
stillquietvoice Senior Member Join Date: November 13, 2015 Location: UPSTATE NY Posts: 179	243 win reformmed to 7mm-08 ive never reformmed brass before can any one guide me through the process of making 7mm-08 from 243 or 308 cases.thank you in advance for your help. __________________ actions speak louder than words flatter tragectories quicker results.

January 28, 2016, 09:58 PM	#3
stillquietvoice Senior Member Join Date: November 13, 2015 Location: UPSTATE NY Posts: 179	with the 243 being longer make 7mm case too ling and require trimming. __________________ actions speak louder than words flatter tragectories quicker results.

January 30, 2016, 10:13 PM	#6
Clark Senior Member Join Date: December 4, 1999 Location: WA, the ever blue state Posts: 4,678	I think that 308 cases can be necked down to 260 if ~~10% with the necks too thick are culled. I think 7mm-08 works well for necking down to 260. I think that necking 308 down to 243 without neck turning is a bad idea. From this we can guess that 7mm-08 is not the best for necking to 243. You gotta watch out for neck pinching. The SAAMI chambers are big and sloppy, but not THAT sloppy. __________________ The word 'forum" does not mean "not criticizing books." "Ad hominem fallacy" is not the same as point by point criticism of books. If you bought the book, and believe it all, it may FEEL like an ad hominem attack, but you might strive to accept other points of view may exist. Are we a nation of competing ideas, or a nation of forced conformity of thought?

January 30, 2016, 10:45 PM	#7
stillquietvoice Senior Member Join Date: November 13, 2015 Location: UPSTATE NY Posts: 179	mobuck the reason why is in my area 7mm-08 cases loaded rounds are hard to find. the gander mountain recently set some space up for reloading. supplies are limited town will not allow them to sell powder or primers, they carry some dies not 7mm-08 no shell holders and a small selection of projectiles again nothing in 7mm. there are a few places i can obtain cimponants but cases are still an issue and have to go out of state to aquire. the shop in ne pa even has some problems with getting some components. it wasnt like this 30 plus years ago . also my supply of both 06 and 308 cases developed corrosion and had to be scrapped . __________________ actions speak louder than words flatter tragectories quicker results.

January 30, 2016, 10:51 PM	#8
stillquietvoice Senior Member Join Date: November 13, 2015 Location: UPSTATE NY Posts: 179	i tried to resize 243 to 7mm to check neck thickness it measured .308". fish in post 2 said neck might be too thin i believe he was right just had to be sure. __________________ actions speak louder than words flatter tragectories quicker results.

January 28, 2016, 09:30 PM	#2
Ifishsum Senior Member Join Date: September 15, 2005 Location: Oregon Posts: 1,033	For .308 cases I just lube (I use Imperial) and run them through the 7-08 die, no special steps. I don't recall if I've actually tried .243 cases but I would lube the inside of the case neck fairly generously. I'd want a stem sizer with a nice gradual teardrop shape to try it. Seems like the neck might be a little thin though

January 28, 2016, 10:20 PM	#4
Doyle Senior Member Join Date: June 20, 2007 Location: Rainbow City, Alabama Posts: 7,167	If the fired .243 cases will fit into your chamber, then you can also fireform them to 7mm-08. Google "Cream of wheat method".

January 30, 2016, 09:27 PM	#5
Mobuck Junior member Join Date: February 2, 2010 Posts: 6,846	WHY???????? 7mm08 cases are available

January 31, 2016, 12:07 AM	#9
James K Member In Memoriam Join Date: March 17, 1999 Posts: 24,383	Note what Clark said about " if ~~10% with the necks too thick are culled." That is true any time a case is necked down any significant amount. The case neck thickens and there may not be enough room at the chamber neck for case neck expansion. That can raise pressures enough to be dangerous. The cases don't have to be discarded, just neck turned or reamed as necessary. Jim

January 31, 2016, 08:27 AM	#11
NHSHOOTER Senior Member Join Date: November 26, 2012 Location: Concord NH Posts: 1,002	Just now checked cabela's, they have 7-08 brass, PPU PRVI Partizan Rifle Brass – 100 $53.99 per 100..not the best but much better than trying to resize 243 brass and they have hornady brass for your 7-08 for 31 bucks for 50..

January 31, 2016, 09:10 AM	#12
Mobuck Junior member Join Date: February 2, 2010 Posts: 6,846	"mobuck the reason why is in my area 7mm-08 cases loaded rounds are hard to find" I've owned a 7mm08 for about 10 years and accumulated a sizable stock of brass buying once fired on the internet(100-200 at a time). In fact, I seldom buy brass or ammo locally.

January 31, 2016, 10:22 AM	#13
stillquietvoice Senior Member Join Date: November 13, 2015 Location: UPSTATE NY Posts: 179	gander here has 308 i believe lc 250 for 80.00. just got 7mm -08. what tool is needed to turn necks for consistant diameters. __________________ actions speak louder than words flatter tragectories quicker results.

January 31, 2016, 11:51 AM	#14
tobnpr Senior Member Join Date: August 1, 2010 Location: Tampa Bay Posts: 4,556	I have no idea why you don't want to make more work out of this than necessary, but here you go... There are hand trimmers as well, and precision ones for competition shooters in the hundreds of $$. In addition to those above,Graf's has 7-08 brass...and I use Prvi and have never had an issue or complaint. http://www.midwayusa.com/product/622...k-turning-tool __________________ Remington 700/Savage Rebarreling /Action Blueprinting 07 FFL /Mosin-Nagant Custom Shop/Bent Bolts Genuine Cerakote Applicator www.biggorillagunworks.com