Fairly recent new gun owner and purchaser of a brand new Walther PPQ SC. I did quite a bit of research into the types of range ammo and self/home defense ammo and used some testing results like those from Luckygunner.com. Regardless of the brand, I purchased a nice brick of 124 grain fmj for my range time because it was cheap and 9mm ammo can be tough to get a good deal on. Over the past week, I watched a video on youtube talking about breaking in a new weapon and the associated ammo to do it with. I also heard that I should use a heavier ammo in smaller guns and lighter ammo in ones with longer barrels.
So I’m curious, is there a real need to “break-in” a weapon and if so, what have you used to do so in terms of weight of the ammunition? Does it matter if I use 115, 124, 147, …? What would be considered the “break-in” period?