Well here I go again, the Ol'Coot jumping in with both feet.
Years ago with my first #1, - and by the way I love those rifles the looks, feel, and shooting, - I found that if I wanted any kind of brass life I did not follow the directions packed with my RCBS full length dies.
Now, this was NOT a #1 issue, as it could have just as quickly been with any number of other rifles or brands. It just happened that it was my experience of short brass life because of over sizing.
If I did follow the directions, brass life was the pits, a situation which would depend on the size of both the rifles chamber and the size of the dies.
However, for years now, I always set my "full length" dies so the die does not touch the shoulder of the fired and sized die, at least not at the time of first setting up the die.
After firing and resizing I feel a bit of resistance when chambering the loaded case, I know I need to "tweak" the die down a small amount the next time I size cases. This situation may come after one time fired or 3 or ? times fired.
The point is to turn the die down, "fine tuning" over time until you have matched your press and die to your rifles chamber.
In this way, you will have cases which relyably chamber plus while sizing them to the minimum amount needed, will in turn will give the maximum number of firings possible from each case.
In the situation with Wayne123, it sounds like he needs to change sizing dies, going to a "full length" type, and then working as I have outlined to find the minimum amount of sizing with that die which will allow for easy, but just barely, chambering.
Keep em coming!
CDOC