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You have me sold, now that is something to chew on! Cool and thank you! Merry Christmas!
The good 3.5mm connectors Joerg tested were the inside out ones with a solid 3.5mm OD male and split 3.5mm ID female like these
Nearly all connectors are made from plated brass (the only exception that I know of are the hollow aluminium 4mm Kontronic connectors) and brass despite having a decent copper content is a p!$s poor conductor at just 28% of copper's conductivity, so if your brass bullet connector was the same size as the wire it would be a huge bottleneck, and it needs to be far bigger than the copper wire to flow the same amount of electricity without heating up more than the wire.
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Nearly all connectors are made from plated brass (the only exception that I know of are the hollow aluminium 4mm Kontronic connectors) and brass despite having a decent copper content is a p!$s poor conductor at just 28% of copper's conductivity, so if your brass bullet connector was the same size as the wire it would be a huge bottleneck, and it needs to be far bigger than the copper wire to flow the same amount of electricity without heating up more than the wire.
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Nortavlag Bulc 
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