24.5 is on the hot side of things.
For the most part I consider a shinny square mark made by the rifling touching. If you polish your projectile with Autosole then chamber it you will see it quite clearly.
As your barrel fouls it will spike pressures and pop primers if you are close. I have just spent too much time developing a load for my mates .223. In the end the 69gn TMK was the ticket for us but every gun has its pet load out there and we just need to find it. 3100 is fast! I'd personally stay with the 2206H if it is shorter (24") Barrel 2208 is also a good choice but will reduce your velocity a little and likely upset your barrel timing node. That said if 24.5 was your best load that is unfortunate as that is most likely is an unsustainable velocity. By dropping back to the next node you may find your load will settle down a bit. It might also open the door to the 2208.
I run an AR15 out to 300 on goats but my mate's .223 has exceeded our expectations. He has pole axed goats at ranges well outside what I would have ever thought possible with a .223. For this reason over past few weekends and today's effort I find myself looking at the .223 in a new light. That said I still reach for a 7mm when the going gets tough.
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