https://www.canadiangunnutz.com/forum/showthread.php/1418830-Barrel-heat-amp-accuracy
Going back a few years , I tested a couple heavier barrel 223 rifles with 90 round strings in groups of ten shots and only pausing to reload. Pics don't load anymore but the last groups from hot barrel, were smaller than the first ones from a cold bore
That Was a very KOOL test you did there !