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You might as well. On a personal level I usually get my MM shiny before the 100th egg, but usually none after that. So something tells me this time it might be stacking a bit better? Though i'm not sure, and only going on my personal encounters.
Found this thread browsing.
I'm not breeding for IVs or competitive use, just personal goals.
Game played: Omega Ruby
Obtained Shiny Charm
Using Masuda Method
I had a Japanese Male Sentret and a Female Furret with the goal of 2 Shiny Sentrets.
I got my first shiny on Egg #12, and NOTHING 500...