Holy threadshift Batman! - I would like to congratulate you esteemed gentleman of the F-TR sport for tuning away a potential new competitor with this rude trashing of a real question from a new shooter. Just what all shooting sports needs. Gentle correction by replying to the post using your preferred verbiage would get the job done and encourage a new shooter as well.
Something like....Mr. Schneider, Welcome to F class shooting. There are many free ballistic calculators available on line that will help you find a minimum velocity needed to be supersonic at 1000 yards for E- targets. I prefer to be a bit faster and target 1300 Feet per second as my 1000 yard velocity. In your 140 ELD-M example, you would enter the values for your local conditions and the 140 ELD-M bullet into the calculator and select a "What if " muzzle velocity. I used JBM and typical spring time conditions for the Midwest where I live. Using 2550 FPS as muzzle velocity and it projects the target velocity would be 1312 FPS. If you have a load that is grouping well and has no pressure signs at 2680 fps, your 140 ELD-M will be 1405 FPS at 1000 yards. That is well above the trans- sonic threshold and will be detected on the e targets.
You mention F- Practical - That is a Club designation I had to look up. I think it is a great idea as a gateway to the sport to " Run What you Brung" but from the NRA rule book, F-open and F-TR are the only recognized matches. F-TR is limited to .223 Rem/5.56 rilfe or .308 Win rifles with bipod and rear bags like you have. Your 6.5 Creedmoor would be in F-open class shooting against the guys with front rests.
This link to CIHPRS web site has some other information that you may find useful.