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I think you are on the right track…
I don't think you will find a better projectile than the old Hornady 75gr Amax or the new 75gr ELD match for a factory rifle setup…obviously custom target guns setup to run 90gr projectiles are in a totally different realm then we are talking here.
I've tested just about everything available up to 80.5grs in my 223, and finding the 75gr Amax projectile to be the best combo if you weight sort and inspect everything in the load… the 75gr projectiles shoot like a dream out to 1000yrds. Its is by far the easiest and most accurate projectile I have loaded in my T3 “once” you find the sweet spot for the gun for both COAL and charge weight… If I play with the charge weight +/- to compensate for temp and weather my gun is a consistent Moa shooter out to 1000yrds.
I've altered my factory mag to accept the longer OAL, so its great for long range predator hunting.
I shoot the 75gr Amax (will be switching to the new ELD) with 25-25.5grs Varget…25.2-25.3grs being the perfect sweet spot…I increase or decrease the load by .2grs to dial in different conditions…
Even though Varget is considered temp stable, the small change in charge weight does help to get the rifle shooting best and consistent from summer to winter shooting.I pretty much only shoot 60gr Noslers and 75gr Amax through my 223…Both extremely accurate loads.
See attached for load development on the 75gr Amax and how they seat in altered factory mag.
