Although the ammo availability situation is still not ideal, try to get a few different boxes of cartridges and shoot some groups to compare. Your rifle will ultimately show you what ammo it likes the best. 🙂

I picked up a new T3x Superlite rem mag a few weeks ago and found some 175gr hunting ammo to test next week end (I hope)

You should be good up to about 180gr if your worried about stability; the hard part is finding ammo

If you hand load this shows berger 180 vld as marginally ok for 9.5 twist

https://bergerbullets.com/twist-rate-calculator/