A while back rbwillnj gave me the same tip regarding the McMaster source.
I ordered a length and it works really REALLY well.
The walls are a bit thicker.
The material is stronger and does not seem to discolor or scratch like the original tubes.
I think you will be happy with that McMaster sourced tube material.
One thing to note however, the McMaster tube is just a bit too tight for .44 Magnum and .44 Special cases.
45 ACP will pass thru.
Also if you have an old Freeloader funnel, you may have to build up the outside diameter with some
electric tape to stop excessive wobble and provide a good fit.