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223. 75 eldm stability

That would be about right, maybe a bit faster even to have a comfortable margin.
With any "built" rifle having a 28-30" barrel, getting close to 3000 fps with an 80 SMK shouldn't be too hard.
My Tikka has 2 built-in handicaps for an entry level F-TR rifle, first being the relatively short 24" 8-twist barrel and second is the standard SAAMI chamber with short throat.
I call them handicaps, but it's a rifle that was meant to blow up varmints at 300-500 yds, not lob target bullets accurately at 800-1000 yds.
I'm sure it is a beautiful rig for it's purpose.
The challenge with an SMK 80 using a 24" bbl is exactly what you point out, the 223 case volume means you will have to play the game if you want to be over M1 going past the target at 1000 yards.
It is doable but does require careful attention to powder selection and/or playing at the edges with compression loads.
The ones like H4895 or Varget that show good temp stability will work for some folks and not for others with a 24" factory rig. The thinner the air, the better. Good Luck and have fun!
 
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