6.5 CM 143 ELD-X A 4350 43.0 Hornady brass WLRM primer 2.810 OAL 1/2 turn on factory crimp, zero signs of pressure 2700 FPS bullets touching each other at 100 yds, rifle Mossberg predator 22" barrel suppressed, hopefully this helps.
Hmmm I have had good luck with accurate 4350 6.5 Creedmoor 143 ELD-X 43.0 gn Hornady brass WLRM primer OAL 2.810 2700 FPS Mossberg predator 22" barrel suppressed zero signs of pressure, confused about comment that accurate 4350 isn't even close to IMR 4350 or H4350 I am showing very close it...
I think we all got a lesson this time around, I am currently good on projectiles for life, could use some more primers and of course some powder. I am loading Accurate 4350 now to fill the void of H4350 and IMR 4350 it is working out well.
It definitely appears to be to long for your chamber and I agree you need to see what your chamber can handle. You could have a bullet where the ogive is smaller in diameter and it chamber and work but other bullets can have a bigger ogive point.
In the Hornady manual it does have a COL of 2.950 for the 6.5 PRC with the 143 ELD-X but you are going to have to figure out what your gun chamber will take in length period.