Originally Posted by westcliffe01
Whats the point of fireforming in a different chamber than the final one in your weapon ? The head space could be different, the reamer could be different, there are so many variables...
I fireform for my 243 AI by shooting a loaded bullet from the rifle. It groups 1/2moa and while velocity may be lower it is pretty consistent. I will hunt with my "fireforming" load.
Any more, this is what I recommend doing.
I have 3 wildcats that require fire forming and have built many more and they all shoot under a 1/2
MOA during fire forming with hunting loads.
In the 280 AIs I use standard 280 Rem Loads as well as every other wild cat. 22 K Hornet,223 AI,
7/08x40,30/06 AI,300 Rumbo,338/375x40 (These are not Squib loads but standard hunting loads
Unless you are in a hurry to fire form this works well and no more fire forming is necessary as is with
Squib loads and barrel life if not wasted fire forming with loads that can not be used for anything.
I also use standard loads to do the breaking and end up with over 20 fire formed cases to start load
development with the modified cases.
It seems like a lot of trouble and expense but each to his own.
J E CUSTOM