After doing a fair amount of reading on various forums there does not seem to be a clear cut solution to the problem. The mix of comments is about 50/50 but of those that have had good luck with a baffle, they seem to prefer the red plastic. Maybe because they are less expensive.
I have done a little experimenting. Probably spent too much time researching. I installed a metal baffle and to my surprise the powder charge dropped changed significantly, >1 grain. Interestingly, the change was an increase in dropped powder charge with the baffle installed. Just the opposite of what I would guess.
A friend of mine who is an ardent baffle user decided to try some E3 powder for one of his loads. The results were extremely erratic with a red baffle installed with dropped charges varying by as much as 3 grains. He was baffled!
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