243 win 28” barrel powder advice

Goose71

FNG
Joined
Jan 6, 2023
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Getting a 243 win barrel 28”. Looking to shoot 70-90 grain tips. Haven’t used a long barrel would I use a bit slower powder because of the longer length barrel. I’m accustomed to 22-24”. 1-10 twist I usually use Imr 4350 or h 4350 and at times rl15 or VARGET.
 
You have to look at projectile weight for powder selections. Longer barrel will just give more speed to a certain point. Try the H4350 and imr4350 and it should be fine.
 
According to Gordon's Reloading Tool, using 90gr eld-x:
H4350 is ~88% case fill and ~3280 fps max
Staball 6.5 is ~93% case fill and ~3165 fps max
Hybrid 100V is ~98% case fill and ~3175 fps max
 
Ramshot Big Game - 89% fill, ~3270 max
Ramshot Hunter - 98% fill, ~3300 fps max
 
RL26 and RL17 are probably going to be a couple of your top performers with regard to velocity but RL16, RL23, and H4350 should do well for you too.
 
Depending on what twist you'll be using I'd look really hard at heavier pills. I'm throwing 108's out of my 26 inch 243 rite at 3100. I know the old 243 isn't as cool as some of the newer calibers available but it's still kicking ass 😅
 
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