Modern Spartan Systems Pepsi Challenge Pt. 3 – Copper Solvent Aggressiveness

We’re doing a set of experiments; including confirmation runs, to analyze the effectiveness and harshness of various copper fouling solvents that are available to the sport shooter. The first test looks at aggressiveness and total dissolved copper capacity per unit volume of the solvent. The results were not entirely surprising.

For the first run we selcted WipeOut, Sweet’s 7.62 and Copper/Lead Destroyer from Modern Spartan Systems. We’ve already experimentally confirmed that Copper/Lead Destroyer will remove copper fouling and that it likes a longer time to do it than competitors, meaning it’s less aggressive. But how capable is it (how much copper can it hold)?

We’re soakin. Yessiree. Dissolving. What a sight to see.

After normalizing the weights of 3 Barnes bullets we dropped them into test tubes with measured amounts of each solvent and let them soak. We didn’t knock off any oxide or other coating that the bullets had on them. We just dropped them in to the solvents. After 15 minutes there was effect enough for color changes in WipeOut and Sweet’s 7.62, though the changes were very slight. After 2 hours no real difference. After 2 days the WipeOut and Sweet’s bullets looked like they’d been hit with sandpaper and were showing rolling over of formerly sharp edges. The C/L-D bullet was seemingly unchanged on the surface other than darkening just a little.

WipeOut, Sweet’s 7.62, Copper/Lead Destroyer, bullets after 5 days soaking. The Sweet’s bullet looks like 5 miles of dirt road.

24hr copper dissolution:
Wipe-Out: .2gr per 2tblsp in 24hhrs
Sweet’s: .2gr per 2x tblsp in 24hrs
MSS C/L D: .1gr per 2x tblsp in 24hrs

48hr copper dissolution:
Wipe-Out: .2gr per 2x tblsp in 48hhrs
Sweet’s: .2gr per 2x tblsp in 48hrs
MSS C/L D: .1gr per 2x tblsp in 48hrs

120hr copper dissolution:
Wipe-Out: .3gr per 2x tblsp in 48hhrs
Sweet’s: .4gr per 2x tblsp in 48hrs
MSS C/L D: .1gr per 2x tblsp in 48hrs

So we see that the Sweet’s kept on keeping on after an initial slow down. This is what I’d expect from something that’s really aggressive. Use up most of the reagents quickly and then continue until they’re all gone. I didn’t expect it to have such long legs. That’s what you might call “power and endurance”. WipeOut had the aggressiveness but not the endurance. C/L-D may have had great endurance or not, that didn’t show up. What showed is the carrying capacity it has for copper is pretty low and it’s not nearly as aggressive as the others. It does seem to like that 24hr soak though.

We’re re-running this test with a fresh set of Hornady GMX 180gr bullets in just a few days. We’ll post the results as soon as they’re ready.