ASSRA Forum › General › Reloading the Single Shot Rifle › How to blow out a cartridge
(Moderator Group: Moderator)
‹ Previous Topic | Next Topic ›
Page Index Toggle Pages: 1 Send TopicPrint
Normal Topic How to blow out a cartridge (Read 467 times)
Babydriver
Senior Forum Member
****
Offline



Posts: 254
Joined: Mar 22nd, 2024
How to blow out a cartridge
Apr 26th, 2026 at 8:32am
Print Post  
I have a Maynard in 40-70 Maynard and need to blow out some 30-40 krag to make the proper case. What’s the best and safest way to do it?
Thanks
  
Back to top
 
IP Logged
 
ssdave
Frequent Elocutionist
*****
Offline



Posts: 2132
Location: Eastern Oregon
Joined: Apr 16th, 2004
Re: How to blow out a cartridge
Reply #1 - Apr 26th, 2026 at 9:31am
Print Post  
Put 6 to 8 grains of a medium fast powder in the case, fill the rest of the case with cream of wheat or similar coarse ground cereal dumped in over the powder (no wad) and put a dab of grease, wax or  ball of paper in the mouth to hold the mess in.  Go outside and fire.  It will fireform the case perfectly.  Adjust down if it tears off the neck, up if it doesn't fill out correctly.  Helps if you anneal the neck first.

Smells bad enough you don't want to do it inside, but you can by firing into a garbage can.  Don't use flour, the fine material will tear off the case necks.
  
Back to top
 
IP Logged
 
Deadeye Bly
Frequent Elocutionist
*****
Offline



Posts: 1135
Location: Stephens City
Joined: Feb 25th, 2011
Re: How to blow out a cartridge
Reply #2 - Apr 26th, 2026 at 9:42am
Print Post  
Krag brass is too short for the 40/70 Maynard. You need a case 2.4" long or a little longer to trim to length. 405 Winchester is a good candidate. The stretched Krag brass from Baco would work. 9.3 x 74 will work but the rims are a little thin.
  
Back to top
 
IP Logged
 
yamoon
Oldtimer
*****
Offline


NRA Life, ASSRA , GGCA,
MCA

Posts: 999
Location: Junction City Kansas
Joined: Feb 11th, 2012
Re: How to blow out a cartridge
Reply #3 - Apr 26th, 2026 at 11:22am
Print Post  
Not to hijack the thread, I have a similar question. I am shooting a 9.3x57r (360 BPE) I am currently making brass from 9.3x72r but neck turning is required. I was thinking of trying 2.125 38-55, it would be .125 short and the head would be .010 small, do you think it would work?
Mike
  
Back to top
 
IP Logged
 
marlinguy
Frequent Elocutionist
*****
Offline


Ballards may be weaker,
but they sure are neater!

Posts: 17942
Location: Oregon
Joined: Feb 2nd, 2009
Re: How to blow out a cartridge
Reply #4 - Apr 26th, 2026 at 12:01pm
Print Post  
yamoon wrote on Apr 26th, 2026 at 11:22am:
Not to hijack the thread, I have a similar question. I am shooting a 9.3x57r (360 BPE) I am currently making brass from 9.3x72r but neck turning is required. I was thinking of trying 2.125 38-55, it would be .125 short and the head would be .010 small, do you think it would work?
Mike


Wouldn't .30-40 Krag or maybe .303 British be a better donor brass?
  
(You need to Login or Register to view media files and links)
Back to top
 
IP Logged
 
oneatatime
Frequent Elocutionist
*****
Offline



Posts: 4416
Location: Rocky Mountains
Joined: Oct 30th, 2011
Re: How to blow out a cartridge
Reply #5 - Apr 26th, 2026 at 4:17pm
Print Post  
Vall, for yamoon, the 30-40 has the length but then the rim and the base would have to be turned down. The 9.3x72R is a "360" cartridge so normally cut to 57mm run in the sizer (to perfect the taper) and you're done.
  
Back to top
 
IP Logged
 
RBKenn
Senior Forum Member
****
Offline



Posts: 315
Location: fallon
Joined: Apr 8th, 2011
Re: How to blow out a cartridge
Reply #6 - Apr 27th, 2026 at 11:17pm
Print Post  
Cream of wheat smells terrible as SSDave States.  I use corn meal. Similar results not the awful smell.
  
Back to top
 
IP Logged
 
silver
Full Member
***
Offline



Posts: 244
Location: Central wi,
Joined: Sep 20th, 2016
Re: How to blow out a cartridge
Reply #7 - Apr 28th, 2026 at 8:17am
Print Post  
Never tried cream of wheat I always use corn meal. Doesn’t smell much at all.
  
Back to top
 
IP Logged
 
sharps4590
Full Member
***
Offline



Posts: 119
Joined: Mar 24th, 2016
Re: How to blow out a cartridge
Reply #8 - Apr 29th, 2026 at 8:47am
Print Post  
ssdave wrote on Apr 26th, 2026 at 9:31am:
Put 6 to 8 grains of a medium fast powder in the case, fill the rest of the case with cream of wheat or similar coarse ground cereal dumped in over the powder (no wad) and put a dab of grease, wax or  ball of paper in the mouth to hold the mess in.  Go outside and fire.  It will fireform the case perfectly.  Adjust down if it tears off the neck, up if it doesn't fill out correctly.  Helps if you anneal the neck first.

Smells bad enough you don't want to do it inside, but you can by firing into a garbage can.  Don't use flour, the fine material will tear off the case necks.


Excellent advice!!  The only thing I do different is I use corn cob tumbling media.  It has no odor and makes for a GREAT wingshooting load for wasps, bumble bees, hornets, yellow jackets or any other flying insect vermin!  They simply disintegrate!
  
Back to top
 
IP Logged
 
Page Index Toggle Pages: 1
Send TopicPrint
‹ Previous Topic | Next Topic ›
 
  « Board Index ‹ Board Top  

ASSRA Forum » Powered by YaBB 2.6.12!
YaBB Forum Software © 2000-2026. All Rights Reserved.

Valid RSS Valid XHTML Valid CSS Powered by Perl Source Forge

Page completed in 0.6120 seconds.