Rio and Noble Sport primers are definitely larger in diameter than nominal 209 primers. Fiocchi are larger but usually not enough to cause problems. If you want to be able to load all the hulls you can scrounge, buy the Rio or Noble Sport primers from the start and use them in all your hulls. Remington hulls will take a bit of effort to seat the first primer, but no problem after that.
Cheddites, Winchester, Federal and Remington are all very close to the same size. CCI are just rebranded Federals.
Don't know how much you intend to shoot, the cost savings in shotshell reloading is based on buying in large quantities. I have shot a bunch of the Noble Sport primers. When I was shooting a lot of Trap, and Noble Sport or Rio primers were cheap, I would buy a case of 5000, assign 500 hulls to to case load them 10 times. Hulls wore out about the time the primers ran out.
Michael
