First off- Don't get all up about better groups. In reality it's maybe 50/50 on better or worse groups. Many tests have been done on this subject and it's 6 of one half dozen of the other on better accuracy with fired formed. If it works for you ,go with it. Lot's of bench shooters will FLS everytime. It falls into the same category as bedding a action, Bedding an action can destroy accuracy also.
As stated,DO up a few rounds and see what your rifle likes. You might find yourself back a FLS,
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