Hi GWH, firstly determine what neck thickness and tension gives you the tightest groups at 500 and 1000yrds.
The range results will tell you everything you need to know.
For example -your rifle and load may like the thickest necks possible so you might not need to trim in the first place.
Use once fired brass and do 4 at a time so if you ruin their accuracy it's not a big loss to you.
Take your reloading and case prep gear to your range to speed up the process.
We often like to tinker and tell the rifle what we want it to do accuracy wise, but the rifle will soon tell you what it likes.
Don't be fooled into thinking this is a fast process, the first sentence in this post may take you months of calm mornings/afternoons to come to a measurable conclusion, fortunately you can have some real fun during the learning process.
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