It's a Ruger American and it is a 1:9 twist. The gun is a tack driver with the bullets. Th other part of this whole decision is that the rifle is a piece of crap IMHO (due to its ridiculous bolt design) and it's time to move on. So, I am killing 2 birds with one stone here. We had a misfire this year that took forever to troubleshoot and when I discovered what caused it, I decided IMMEDIATLEY that it was time to sell the rifle and move on. She may never recover from that misfire on that buck. Luckily, I was right there and corrected the issue and she was able to make it happen, but it really was a terrible situation.
You can read all about that issue here if you want....:
https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/16512911/ruger-american-misfire
FYI, over the last 30 years I/we have had limited or non-existent blood trails with .243's using cor-loks, Winchester ammo, federal ammo and Hornady ammo. Several of the deer went a long way even after having great shot placements made. Thats why I say that IMHO a .243 just isn't a good fit for deer in the terrain I hunt. I am not hunting wide open plains....
To each their own but IMHO the .243 just isn't my first choice (or my 77th) for deer hunting. Seen a lot of deer go unrecovered by people using them.
It's a personal decision.