I have the RPRR in .17 HMR, and the Lucky 13 mag (25 rd) works perfectly. Initially I found that CCI fed more reliably - the intermittent issue was actually that the lip of the magazine would slightly overlap the rim of the fired case, preventing ejection - but a very light file of that lip allowed all ammo I tried to run perfectly. I tried Federal 17 grain, CCI 20 grain, and Hornady 20 grain (settled on the Hornady - crazy good groups - with CCI as a backup for when it isn't available).
In relation to the BX-15 that came with the rifle - it would only hold nine rounds. I tried to undo the two hex-head bolts, but discovered they'd been drilled out (tamper-proof?), so went to a mechanic mate and used his Easy-Out to remove them. Located a section of what can best be described as garden hose wedged in the magazine floor, removed it, slotted the bolt heads with a 1mm grinder disc (allowing them to be re-inserted by way of slot-head screwdriver), and the OEM magazine now holds the advertised 15 rounds. Annoying, but fairly easily solved.
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