ihuntbuck
Just my opinion, but I would not spend the money on the vari-flame. I have one of those also it does very littleto stop blow back. The way the 25acp fits into the BP it seals itself against the bottom of the BP and does not allow blow back to occur...
The accuracy thing is a none issue... if your powder is good.
You could have your current BP drilled out to accept the 25acp rather than purchasing one, or you could do it yourself - there was a thread on here about what drills to use... I took mine to my local machinist.. he charged me $9 to drill mine...