Which would you go with? I am going to be using 80-100gr bullets.

I'm running '17 in my AI.

I've ran 17 with the TSX, but with the 100 grain cup-n-cores, I get noticeably better accuracy with H4350. I'm not running the c&cs to the firewall.

With the TSX, 17 was the velocity champ and accuracy was equal to the 4350s.

Edited to add: I haven't tried 19.

if you have both 17 & 19 on hand I'd go with 17. if you dont have either and got to buy powder anyway buy some H4350 and dont look back. H4350 has been great in my .243 with 100 and 105gr bullets and my in 30.06 with 165 and 168gr bullets

I'm running R-19 with 105 grain Amax bullets with outstanding results. Have yet to try H4350 and I have a lot of it, I just need to get caught up on other projects before I start another.

I went through a long list of good loads from experienced guys here... IMR-4350, Hunter, RLs -15 & -19, and CFE all w/ bullets from 60-100 gr and nothing would give less than 1.5 MOA until I tried RL-17 which has me between sub & 1.25 MOA consistently with nearly all the bullets I'd tested previously.

I told the story w/ a bit more detail here .

Try it, but if it doesn't work don't hesitate to try one of the other "stand-by" powders.

Good luck!

Not what you asked but H4350 has worked very well for me.

I'm just trying to get an idea of what might work better so that if I see one or the other I can pick it up. There has been a big run on powder and there isn't much left.

I was able to get more velocity out of 80g ttsx, 85g tsx, and 100g Partitions using RL-17

IMR4350