Recommended slug diameter for prophet

[viperjoe]

Will be ordering a .22 prophet performance and want to order ammo at the same time.
Is there a consensus on what diameter works best in it?
Thanks

 

[Mrshosted]

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[Yorkie]

The RPB-1 barrel with 16 twist seems to be very tight. Mine works best with .217 or perhaps smaller. The .218 cause it to foul up quickly.
I thought it liked H&N 27g best but today the 25g (that I had tried before) seemed to start working very well Both.217