Wild ES with Tac 223 Load

[N_Turs]

Ok, So Im pretty new to loading rifle ammo. Just recently loaded up some 223 rounds for the Ar using Tac. I did some different charges around the lower end of the chart. All rounds loaded function fine and sense its just blaster ammo the accuracy was fine for what its being used for as well. My issue was the ES was 120 fps. I know tac isnt very temp stable but that seems like alot of variance. Im also in AZ so the morning temps were around 78 and midday 101.

What might I be missing thats causing the ES to be so high?
Im using FL sizing die with 21st mandrel about .002 tension with a slight crimp after seating because I was getting some bullet movement when charging rounds.

Loading on a dillon 650 using dillon powder drop.

Im trying to get better at loading these before I try and load some 77gr OTM's

Thanks in advance for any help

 

[68ss396]

What grain bullets were you using?

I dont have a lot of luck with TAC even though it meters easily, it should do alright with 77gr OTM.

If you have the patience for stick powder you can get low SD and ES, Ive had under 30 ES with Berger 77gr OTM out of a gas piston AR. Not practical to load if you shoot a ton.

 

[N_Turs]

Loading 55gr FMJBT trying to stick with a powder thats easy for bulk loading

 

[68ss396]

TAC is better with a heavier bullet.