fireforming

[shaleetoo]

what is  the  correct  way to  fireform  6mm-06 a. i. brass from 25-06   brass

[Nobade]

Depends on the neck diameter of the chamber. Email or PM me if you want details.

[dave375hh]

Neck size the 25-06 brass with a 6MM neck die , but only enough to allow it  to chamber with resistance. What your doing is creating a false shoulder of sorts at the base of the neck. This will hold the case against the boltface and center it in the neck. I then use an amount of 2400 that represents 25% of the case capacity, in this case about 15 grains. I then fill the case to the neck with untreated walnut tumbling media and drip a little candle wax on top to seal them. They can now be fireformed in your chamber. I usually clean the bore after every 10 shots just using a patch with shooters choice or Hoppes, 2-3 passes then go back to fireforming. I've done thousands of cases this way with no losses or problems. I used to use Cream O Wheat but it can go solid if it's humid. I had this happen and luckily it just blew past the plug, so no more cream o wheat

[Nobade]

If you need to do this, your rifle is not set up properly. Assuming you don't have a chamber neck tight enough to require it, you should be able to run a 25-06 case into your 6mm-06AI die, load and fire. To check if the rifle has excessive headspace, do this to an empty primed case, and fire it. If the primer is sticking up at all above the base of the case, the rifle is set up too loose and should be checked. The bolt should be hard to close the first time, and will be correct after fireforming. If you have a chamber neck tight enough to cause problems, the procedure is totally different.