Afternoon ironglowjr,
First off, make sure that your cases fit the chamber before ever completing the reloading cycle of priming, charging and seating the bullet!
Then, always size the case the least possible amount that relyably allows for easy chambering.
In another answer to your question it was mentioned that there are cases where a small base die might be needed, but while it happens, that is not typical.
Not knowing what type of dies you use, the following speaks to the info sent out with RCBS full length sizing dies.
If you follow their printed directions, you may rob yourself of optium case life and case to chamber fit.
I found this out years back and have since followed the following method of setting up "full length" sizing dies, of any brand, to my rifle/die combination.
Providing the brass has all been fired in your rifle, DO NOT!!! follow the manufactures directions to set the full length die down to the shell holder plus enough more to the point where you can feel the ram "pop" over center when it reaches the top of it's stroke.
This does full length your brass, but depending on the size of your rifle chamber and the size of the die, may lead to over sizing the brass and very short case life.
Rather, take fired cases from your rifle and adjust the sizing die down only to the point where the brass chambers easily and relyably.
Set your lock ring at this point and begin sizing all your brass.
Now, at some point after the brass has again been fired in your chamber, you may again notice the brass seeming to be a bit tight when you close the action.
If so, loosen the set screw on your die lock ring and set the die down JUST ENOUGH to again allow for easy chambering.
You may need to make this change a couple of times, but will soon arrive at the point of optimum sizing for your rifle and die combination.
All rifle chambers and dies are made within manufacturing tolerences, and as such each chamber and die will differ slightly from the specs, therefore the above way of adjusting YOUR DIES for YOUR CHAMBER will give you the best possible fit.
Keep em coming!
CDOC