I have had some hornady and some federal factory that were hot, and some of those were Creedmoor. Flat by itself isn’t too much of an indicator, sometimes just how the case is smacked by the deflagrating powder… the flat, plus badly cratered primer strike, plus ejector swipes, all those told me I was way over for some federal 6.5 creeds in my ar10. Could be it’s oal was too short for a mono in that ruger , that’s something only you will be able to find… try 2 or 3 over a chrono, and compare. Even being a little over - and I mean just a bit- in a falling block won’t have the potential like being over in an AR.
Falling blocks and bolt actions have more margin allowable in their design. That being said, you don’t bank on it or make it a practice to exceed,.
Edit to add, in that 6.5 ar 10, I shot I think 3 or four before I noticed, but then put that box back in my bag. AR 10,s have the same 62ksi limits as a bolt action, that’s where they are different than ar 15’s.
Falling blocks and bolt actions have more margin allowable in their design. That being said, you don’t bank on it or make it a practice to exceed,.
Edit to add, in that 6.5 ar 10, I shot I think 3 or four before I noticed, but then put that box back in my bag. AR 10,s have the same 62ksi limits as a bolt action, that’s where they are different than ar 15’s.