The Safariland 333 is not IDPA approved.
As the 333 was the only Good Speed Loader carrier available when IDPA outlawed it. And considering that it was made in a 2.25 Inch Duty Belt model, and not just the 1.5 Inch Competition Model, and still is. It looks to me like the powers that be deliberately outlawed it, with the intent of keeping the HKS Speed Loader in the game.
I have a 333, and it is plenty secure for even Duty Carry. In my opinion the Comp III and the 333 Carrier would probably be the only loader and carrier used in SSR if the 333 had not been taken out of the game years ago.
I have a couple North Mountain Carriers for my K Frame. They may be legal, but they are what I would consider to be competition only gear. Very Big & Blocky, not something for Real Concealed Carry.
I am not real impressed with Blade Tech either.
Just my 2 cents
Bob