Use a clean burning powder like VV n320 to make sure that the "crud" you're expecting is influenced by the primer. Seriously doubt that there will be any noticeable difference. Good luck with your obsession.
Actual Results from firing Fiocchi Non-toxic primers:
Our poster friend above will be surprised. There were noticeable differences.
Can you guess which round of 7.62x25 had the non-toxic primer?
If you thought maybe the middle one (third from the left), then you are good at this stuff.
No special powder was used, just the normal load of Titegroup for this cartridge, in all cases.
Any problems? I only made and shot of one round with the Fiocchi non-toxic primers - so I can't tell you about grouping, or anything like that. I can say that it fired with the same apparent pressures as the others and the fired primer looked normal (but green because they are coloured that way).
Any other issues? Yup. They come in a brick of 1,500 (not 1,000). There are 10 boxes of 150 primers in there. They dump fine into my RCBS flip tray. However, if you pick them up with a Dillon pick-up tube remember that tube only holds 100 or so primers. In that case, you are best off dumping half a box of primers at a time (say, 75).
How can actual non-toxic primers be so much cleaner than the normal ones (I used Winchester SPs in the above test)? I think it is because the normal - toxic/
lead styphnate- based (LINK) ones react with the propellant to make lots and lots of a cruddy compound (in combination). By contrast, the non-toxic primers plus propellant do no react to make these great volumes of lead containing crud compounds.
That why crime labs are able to find lots of "gun shot reside" - from the conventional primer(s) on the hands and clothes of the shooter, plus the target, the surrounding areas etc. - all from one little itsy bitsy primer. As a matter, of fact crime lab guys probably really like the fact that conventional primers are really dirty and produce lots of easy-to-detect lead compounds, on firing.
As for me I'm not a clean freak but I don't like gun crud. In my experience in action shooting, I have seen gun crud cause stoppages in less than 100 rounds. I will probably switch to non-toxic primers just for that reason. Any health benefits are just a bonus in my books.