The quality of internet "specs" depends on the site. Powder and bullet maker's sites are reliable. YouTube, not so much.
I have data in an old(1988) Accurate manual. If you want it PM me. Test firearm was a 14" Contender if that matters. 230, 250 and 260 grain bullets.
There's data on Hodgdon's site too. That's where Lee gets their data.