SmallCaliberCentral

Hello everyone. I'm new to this site & could use some help. I'm almost finished with my AR .204 ruger build. My parts consist of a Black Rain lower, Seekins billet upper assembly, Seekins hand guard, and a Shilen 24" match barrel with 1-9 twist. My question pertains to the 1-9 twist barrel. Almost all I've read about have a 1-12 twist. I'm wanting to shoot 35 to 40 grain bullets, mainly 39 gr. SBK's. Any problems that ya'll might foresee? Any powder recommendations? Any help and information you might give me would be appreciated. Thank you for any help & have a great day.
TEJAS JD
SOUTHEAST TEXAS