WW2 US surplus 30.06 ammo is it safe to shoot in a high number Rock Island 1903?

[usabaker]

Hoppes 9, then Sweets 7.62 solvent

Here is a quote from American Gunsmith January 2015:

"Avoid mixing different brands of solvents. For example, avoid using Hoppe’s No. 9 on a bore brush to remove carbon fouling (a good thing) and then following it with Shooter’s Choice Copper Solvent or Sweet’s 7.62 on a patch for copper fouling. ... Before email, Boots Obermeyer sent his customers a letter typed on a real typewriter and mailed with a real stamp. He documented ruined gun barrels that had been damaged by the sort of example I just used above. It seems that mixing solvents can result in unintended compounds that can be harmful to the barrel. You can, however, use Hoppe’s No. 9 on a brush to get the carbon fouling and follow it immediately with Hoppe’s Bench Rest to get the copper or use regular Shooter’s Choice on a brush followed by their copper remover. Stay with the same brand of solvent. "

Take it for what its worth.