Seems to me that vudoo is a pain in the ass when it comes to magazines and feeding issues. So why does everyone jump on the Vudoo band wagon?
Also you buy a Vudoo barreled action and then take the barrel off and replace it. So what makes the action any different than lets say a CZ457? I may be asking stupid questions but like I said, I'm new to this.
I haven't had a feeding malfunction in my 1st-gen Vudoo in literally years and thousands of rounds fired, including a dozen or so matches each season.
Keep in mind that Vudoo's controlled-feed design ABSOLUTELY REQUIRES perfect fitment between action and stock/chassis. Whereas centerfire rifles with bottleneck calibers have a relatively gigantic hole into which the cartridge feeds, the Vudoo (and Rim-X) has to pick up the round from the magazine and insert the soft bullet nose into an opening of pretty much the same diameter - WITHOUT the bullet hitting anything on the way in. That's a pretty challenging thing to accomplish. Compare this to the usual ramp feed in CZ or pretty much every other design where the bullet nose hits a ramp and maybe the top of the chamber during the feed cycle - possibly deforming the bullet.
When my rifle was new, it would frequently fail to pick up the last round in the 10-round mag. Turns out I had about 3/16-1/4 inch of vertical play in the magazine. MPA sent me one of their then-new, now-standard adjustable magazine latches for the BA Comp chassis. Problem solved, reliability now 99+ percent (I'd never claim 100% on pretty much anything).
-----
I don't know what you mean by "... you buy a Vudoo barreled action and then take the barrel off and replace it." You get whatever barrel you want. If you want to replace the barrel, then replace the barrel. If you don't, then don't. I replaced my original 20" Kukri-contour Ace barrel with a longer Bartlein MTU barrel because I wanted to try it. Rob has gone to the 1.2" straight contour like a lot of people have (I don't want to deal with that much weight cuz I'm old&decrepit).
------
There is no "design flaw" in the Vudoo mag - there are "design considerations" in the overall design in order to effect the controlled round feed. The "flaw" in the whole setup is that any deviation from required tolerance in fitment between action and stock/chassis manifests as misfeeds. In the Rim-X ecosystem, where 10-round mags cost freaking $125, rounds MUST feed from a magazine; no single-loading through ejection port. Incorrect action/stock fitment often manifests as the round stripping off the mag in front of the extractor and being jammed into the chamber. It is impossible, with its design, for the extractor to slide over the case rim. everyone I know who competes with a Rim-X has a little claw tool stuck on the rifle to clear this sort of misfeed.
-------
In 5+ years of Vudoo ownership (and 2+ of Rim-X ownership), I've seen guys get fed up with feeding issues on both platforms. Both REQUIRE perfect fitment of components. Feed issues are less common with less-expensive factory rifles. If feed issues scare anyone off, then just get one of those.