Google search what ejector marks, cratered primers and flattened primers look like , they are your most basic and easily noticed pressure signs. it all depends what brass your using. I have only ever had split necks in my 204 and that is from brass fatigue I believe, they have been reloaded many times.
if you are loading the 300wsm buy norma brass. it is just over $100 for 50 pieces and is far superior to winchester at not much greater cost.
when developing loads I usually increase in .5 increments 2.5 grains below stated max. if I still haven't found decent accuracy and haven't seen pressure signs I will push past max a few grains until accuracy improves orppressure signs appear.
reloading is not by any means difficult and is only as complicated as you want to make it. just make sure you do everything right the first time and get into good habits, checking and checking again.
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