No problems. Hell, if we all agreed what fun would
that be

?
Primers are discussed a lot more, it seems, over on the rifle threads where some surprising observations have been made. I admit I was very surprised when I first read that SRP's could be safely used in a pistol round. Though the advice generally carries the caveat that loads should be worked up, (and IMHO they
always should), I've got to say that I haven't seen velocities fall much outside the published norm as a result of using SRP's. I own a couple of rifles in 5.56 x 45 so SRP's are all I've bought in years, where small primers are concerned.
Anyhow, I didn't really mean to flog the idea like this but when the small pistol primers that are your primary choice just can't be had, you might want to give this idea a try. Following the mfgr.'s recommendations is generally the most wise course, I do get that. Still, like ghost loading a shotgun, or fireforming the dent out of dented brass, there are some things shooters have learned to safely do that just aren't in the manuals. The use of SRP's in a pistol round is not uncommon among IPSC shooters, so be assured the practice has been very well tested. As always, it is prudent when changing a component to drop your powder charge back a few grains or start near published minimums and work up to the desired velocity.