30-06. I bought the gun new. The brass measures.003 longer using a hornady comparator. And the case head measure .003 larger after firing. Thanks for the help
Lets be clear, after firing a case for the first time the case in .003" longer, over all. Right??
That's not a big deal. New brass often stretches (and stretches most) on its first firing.
The case head measuring ".003" larger" bothers me. To be clear, are you saying the case head (the solid part just ahead of the extractor groove) is .003" larger in diameter after firing?
If so, this is a very NOT GOOD thing. And it would account for early case failure. .003" is 3 times the .001" limit generally accepted as max allowable case head expansion.
.003 case head expansion is BAD, and something a "standard" headspace check may not even see.
The regular heaspace gauges (GO, NOGO and Field) only measure distance from the bolt to the chamber shoulder. If your chamber is that large in diameter (allowing .003" case head expansion at normal pressure) a headspace gauge check (.30-06) won't see it.
To be certain, you need to have a chamber cast made. If the chamber cast shows your chamber to be grossly out of spec (and that's what .003" head expansion with factory loads sounds like to me) THEN you need to talk to the gunsmith and Remington.
Remington, to see if despite the time that has passed, it is a warranty matter. (the most they can do is say "no", right?)
IF your chamber is bad (oversize) there are two options. Replace the barrel with new, or pull the old barrel, cut off enough of the chamber end that it can be rechambered and rethreaded, and reinstalled on the action. (this is not always a possibility, but is possible, sometimes, depending on how much of the original chamber has to be removed to "clean it up" so it can be re-chambered.
Get a chamber cast done, or do it yourself, and measure carefully, to get an idea.
And, remember that despite what we all feel ought to be, and what usually is, a gun isn't "broken" if it fires each round once, without case failure.
Good luck, and please tell us if its really .003" case head expansion, or not..