Before i loaded the 117g bullets, i pulled one of the factory loads apart. The bullet Honrady is using is .984 (sample of 1). My box of Hornady RN bullets is .973 so actually shorter than the factory 100g. Maybe if i pushed the 117g a little faster but i think you are right, im chasing a unicorn with 100g and heavier bullets.

Has anyone compiled a list of .257 bullet lengths? It's not something thats easy to find in the manufacturers publications.

So far we have:
Hornady 117g RN - .973
Hornady Custom 100g - .984
Remington CoreLokt 100g - .940
Sierra 95g BTHP - ?
Speer 87g - .835
Remington CoreLokt HP 87g - .830
Sierra 87g - ?

Thanks for the ideas and help.