I have partly switched over to these dies because they produce very consistent necks and dont need any lube, however.

Every so often you may well find that the cases will need bumping back if they get stiff to chamber. Because I shoot mostly AR based rifles in CSR comps, my brass is FL resized every time and then collet sized, and trimmed to be sure they will chamber perfectly.

I would suggest that any reloader always has a decent FL die for each chambering they shoot, so that you can re-set any once fired brass to a base dimension (because believe it or not some people still dont realize how much chambers can differ, one friend of mine was determined to see how my hand loads went in his AR. "Dont bother" I said, "they are neck sized only". He knew better. We managed to "Un Jam" the rifle and bugger me if he did not try and chamber it again!!).

Also, it even pays to FL size new brass, just to make sure. You can set these dies so that they move the shoulders back just enough to not over do things, but still chamber nicely every time.

So yes, I would use them, but also have a FL die as well. I am not sure why you want a bush die as you then get into the realms of bench rest/F Class and will end up neck reaming and turning to get the things spot on.

The collet dies are used by BR shooters stateside which may give an idea that they work well. Be careful setting them up and approach the "Over cam" position very carefully. I got over enthusiastic to start with and was using a pokey Forster coaxial that would crush a tank...and blew the alloy cap straight out of the top of the die You will be able to just about see the marks where the collet closes down on the neck. Remember the trick is to work teh brass as little as possible.

I would make up a dummy round and check it chambers then, when you arrive at a good load, make another dummy, write its vital stats on the case, and store it. If anything gets changed lost or damaged in the loading department (and it will), you have a working reference.