Quoted:
I find that lots of oil is a big mess. Dirt, dust stick to it and it and it splatters around till it gets hot. Then gravity gets it and it runs off the parts you don't want to wear are now rubbing on each other.
My pistols and rifles get Brownell's Action lube. It doesn't take a lot and it stays put even when it gets hot. I have been using this on my competition pistols and rifles for close to 20 years.
My 2 cents
If you are concerned with the oil running, try DuLite's DuraLube. It's a mixture of oil and wax and does not run after applied.
At work, we did MILES training for the last month. Using standard oil based lube and even grease, we experienced malfunctions after the rifles started getting dirty. Very dirty, actually. Blanks suck.
The last few days definately saw the most rounds. We went through just under 2000 rounds in five rifles in two days. As a test, I brought some Mobil 1 10w40 and DuraLube. The two test rifles were problem free. They definately started the day dripping wet, and the Mobil 1 lubed rifle stayed that way. It doesn't burn off like standard oil lube does. The rifles lubed with Remoil were burnt dry after the first few drills.