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25-06 case head seperation?

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Old 02-18-2010, 02:27 AM
Bronze Member
Join Date: Apr 2009
Posts: 77
25-06 case head seperation?

I have an H&R Ultra hunter and have reloaded brass and full length resized about 5-6 times and then this happened.Next reload on my 25-06 , starting at min recommeneded start load with new powder and working up to max load. I did not get to recommeneded max load and this happened. Crack appeared on the 1st rnd but I did not noticed until one case extracted and then came apart after hitting the ground. Noticed after about 4 rnds the cases had a crack around the case head. The 5th had almost completely cracked but extracted from chamber. The 6th rnd completely seperated and case got stuck. Did a terrible job of removing case ? Over worked brass? Left a couple of scratches from removing brass,would that scew up the chamber demensions? Have not shot the rifle since then. Just wondering because reloading manual says to full length size cases everytime for break open actions or cases will not extract and that is true. Tried that on my .223 H&R and cases do not extract if not full length resized. Safe to shoot gun or get new barrel for gun?Any insight woulld be helpful?
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Old 02-18-2010, 02:41 AM
Silver Member
Join Date: Mar 2007
Posts: 430
Re: 25-06 case head seperation?

Does partial full-length resizing have any relevance for you? When the chamber is long, the die, if set to minimum dimensions, will cause case stretch with each firing. The case will stretch and grow thin at the base. Then it will separate. The case should should be sized no longer than is necessary for the reloaded case to fit the rifle's chamber. Redding's Competition Shellholder Set makes proper compensation simple.
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Old 02-18-2010, 05:02 AM
Silver Member
Join Date: May 2007
Location: Taranaki New Zealand
Posts: 182
Re: 25-06 case head seperation?

Plus 1.

Start over with the die a little way off the shellholder and size a case. Check the case fit in your rifle. If it is too tight, turn the die down a quarter of a turn and try for fit agin. Repeat until the brass fits your chamber- without being oversized. case head seperation is a common problem when cases are oversized and work hardened.
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Old 02-18-2010, 05:52 AM
Platinum Member
Join Date: Jan 2007
Location: PA
Posts: 1,077
Re: 25-06 case head seperation?

If you are F/L sizing every reload, your brass is probably work hardened after 5-6 loads. Buy some new brass and start over. Follow the die manufacturer's instructions for full length sizing.
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Old 02-18-2010, 09:29 AM
Gold Member
Join Date: Feb 2008
Location: Sonoma County, CA
Posts: 824
Re: 25-06 case head seperation?

Yote, here is the tool that I use for this. I measure and record case length at the datum prior to and after fire forming, recording results. It will give you an idea of the size of your chamber. I set my dies to partial size the shoulders about .001. If you use this tool, deprime first in a seperate operation, measure, then bump shoulder .001-.002.

Another suggestion, use a sharp pointed tool (sometimes even a paper clip will work) to feel the inside of your case in this area. You can usually feel this seperation start to form on the inside first.

Hornady Lock-N-Load Headspace Gage 5 Bushing Set with Comparator - MidwayUSA
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Old 02-18-2010, 10:14 AM
Platinum Member
Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,101
Re: 25-06 case head seperation?

Used to have the same problem.

I simply use the FL size die to size the neck 1 caliber on an '06 family of cases.

With reasonable pressures I haven't had to do what Moman does, though he gives good advice. If my other rifles weren't wildcats I'd be using it on them.
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Old 02-18-2010, 12:50 PM
Bronze Member
Join Date: Apr 2009
Posts: 77
Re: 25-06 case head seperation?

Well thanks for all the input .
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