I have a savage single shot target action. I like to test for the bullet lands and test for proper sizing and shoulder spacing for my reloads. With a remington style action, You can remove the firing pin from the bolt and place a sized piece of brass in your chamber and feel the bolt close for proper fit.
I do the same thing with my savage.....I made a spring less firing pin to replace my normal one.
This way you can assemble the bolt and close it on a sized round and test for the feel of the chamber.You can also load a round with a seated bullet a bit long and close the bolt. the bolt will push the round forward till the ogive of the bullet touches the landsand pushes the bullet back into the case( for neck sizing only) when you remove the round you can measure the length so that you know how long to make the rounds for that particular bullet and ogive.
It works for me.........