R15 .223 ?? If so its more about tiwist rate determining the maximum weight of the projectile you can use then also what you wish to shoot with it.
Barrel Twist Rate 1:14" 1:12" 1:9" 1:8" 1:7" or 1:6.5"
Max Bullet Weight 55gr FB 65gr FB 73gr BT 80gr BT 90gr BT VLD
Theres heaps of charts on internet discussing this subject as well. I have only used Hornady 55 s training ammo in my newish gun so far.
It accounts for rabbitts , hares , magpies and other small stuff but it also dropped a largish fallow stag ( lucky shot placement according to my mates )
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