ScreaminEagle
Handloader
- Jan 20, 2011
- 1,373
- 0
Is it possible? Just run my 6mm brass into the 257 roberts and done?
Steve
Steve
Anyone ever make 257 roberts brass outta 6mm brass?
- Thread starter ScreaminEagle
- Start date
Bruce Mc
Handloader
- Oct 26, 2005
- 1,278
- 623
Yes I have, and I split a lot of necks. I think the brass was old and once fired. I loaded a few of the ones that survived and they performed the same as regular brass. If I recall they were Remington brass.
Oldtrader3
Ammo Smith
- Nov 6, 2009
- 8,406
- 6
I use a carbide neck sizer ball on dies to make .308 cases into .338 Federal. Have not had a case necks split with Lapua brass.
- Thread starter
- #5
ScreaminEagle
Handloader
- Jan 20, 2011
- 1,373
- 0
Alright, thanks guys
Steve
Steve
nvbroncrider
Handloader
- Aug 20, 2011
- 3,085
- 4
I do the same to make 6-284 brass. Neck down 6.5-284. Also made 338-06AI necking up 30-06. If necking up its best to have a tapered expander. And lube the insides of the neck as well. I use Imperial neck lube.
- Nov 4, 2004
- 25,342
- 8,903
Should be fine. The parent case for both is the 7x57.
JD338
JD338
Divernhunter
Handloader
- Apr 1, 2009
- 812
- 171
Why not just get 257R brass to start with?
Oldtrader3
Ammo Smith
- Nov 6, 2009
- 8,406
- 6
I don't understand because 6mm Rem brass is much harder to find than .257 Roberts? Plus they are only .010 different in the neck. I go up .030 on the .338 Federal without any issues. Dimensionally tour two cases are nearly identical.
HeathSexton
Handloader
- May 12, 2006
- 1,207
- 35
I made 257 brass out of 6mm brass and had trouble, split necks and early case head separation. After reading some it looks like people had better luck necking up to 7x57 and then making a false shoulder with their 257 dies to prevent stretching.
