The Nielsen 168gr fly excellent thru my Texan...the 340 gr is also very good. And get the highest scope rings you can find
congrats on your new texan,next you may want to get the R&L shroud for your Texan,really quite,s it down a lot, enjoy; you will love it,
Are those numbers with the power wheel still in the middle? Have you gotten to full power with the heavy slugs? I'd imagine turning down for round ball and eppug would provide a lot more shots.