I'm fairly new to ML shooting myself. This is what I've done. Most of you guys will think this is "old hat" but, for me, this is the best way I've figured out to make sure I do everything right. Later on, when I get more experience, I'm sure I'll do things differently.
I got a solid aluminum rod with hard anodized coating. I use a commercially available handle. I drilled a hole in the top of the handle and put a screw down into the threaded end of the rod. The other end has a brass jag.
Here's the scoop...
When you go to load the gun, drop the rod down the barrel.
If it is unloaded and clear it will go all the way down to the green mark. If it doesn't, you need to find out why and fix the problem before you proceed.
If ANY of the red or white markings show above the muzzle of the gun, consider it "UNSAFE" until you have found out why and remedied the problem.
Once you have loaded the gun, you should be able to push the rod all the way down to the black line. (The "90" stands for 90 grains of FFg and .530 round ball.)
Assuming you are using your usual load, if you can't push that rod down to the black line, you should not fire until you have figured out why.
Like I said, others might find this to be unnecessary but, until I have gotten enough shots under my belt where the whole process becomes second nature, I think this is a good way to be sure I do every thing correctly.