m24- ya they are like the Winchester super-x red slugs i have. And my PD132 Federal (what I currently have in my gun) is the same color as above.Now that I think about it more, I dont think any shell would be easy to see in a low light, high stress situation. I really think the holes only help if the gun in stored somewhere and you wanted to know if you are picking up a loaded gun(but even then you dont know if one is in the chamber).
Adioss- Your approach is different than mine. If you shoot your gun, you know that you need to reload, if there is a break in the fighting, just start adding shells to the tube with your left hand. Then one does not take their eyes off the threat. Worst case i have an extra shell in my left hand, i can cycle the fore end with one in my hand and if the fighting is done, I could just drop it on the floor or put it back on my gun. Think about what if you shoot someone and they fall, you look at/feel for shells in you mag tube, at that time the guy shoots at you from the floor (you would look like a good target with your gun not pointed at him and you looking away from your target).