You can spend all day shooting at a piece of paper, trying to get the smallest group and still not really learn much, apart from how statistics are a hell of a drug. Instead, can I suggest you start introducing some stressors that shake out where things can be improved and what you need to do to improve them.
In this video, I use ARMA 3 - a half game, half military simulator to show how you go from having no data, through to a setup and confirmed ballistic calculator.
Confirming zero, getting basic velocity data, BC, sight over bore height, atmospherics and more.
With the rise in popularity of long (and medium for that matter) range shooting, so has developed a new language with new terms that get thrown around. ES and SD being two prime examples. So. What are ES and SD? How do they affect your shooting - and more importantly - how can I manage and reduce them?
With the charge weight sorted, it was time to have a play with seating depth to see if we could finesse the load a little. The main consideration here was the smallest group size and seeing if I could reduce the SD any further. Ultimately though, remember, it's consistency over absolute smallest value.
Now - let's be clear - I am not interested in taking 100 rounds to do load development - the less I can shoot to get 99% of the way - I am happy. I have long accepted that the last little increase in precision and the extra time and effort it takes is well lost within my shooting ability.