Start by getting the Speer reloading manual which gives precise case measurements. You will need a reloading micrometer.
Your cases expand in the chamber upon firing and need to be re-formed back to spec to be reloaded and re-used. There are 6 basic steps.
First, cleaning and lubing the fired case.
Second, depriming and resizing the case
Third, trimming the case if necessary
Fourth, re-priming the case
Fifth, dispensing the right type and amount of powder by into the case by weight
Sixth, seating a bullet
The dies on your loader must be set to the right dimensions so your loaded cartridges will fit your chamber.
Find someone who is an experienced loader to coach you. You have to be precise for function and safety purposes.
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