R9's can be a bit finiky on what you feed it. Wouldn't use any lead rds. I only use Winchester 115 gr. Silvertips, others here on the Forum use these as well and also get good results from Gold Dots, 115 gr, & 124 gr, Golden Sabres, 124 & 147 gr. and for practice Winchester White Box 115 gr.
Try these and use what works best for your R9. I wouldn't try anything not recommended as you can get failure to fire, failure to eject, and stove pipes. Save yourself some grief and use what's been tried and proven. Mine is just over a year old now without ever a flaw.