hello, I am very new to reloading. and new to chat groups or pages such as this one, so please forgive me if this has been talked about before. I am reloading for my S&W M&P 9mm fullsize. I love this gun. I have already loaded some 124gr round nose tmj with 4.3 grains of W231 and that seems to work great,. with an oal of 1.128. today I found what I think is a good deal on 1000 bullets of 124 gr hollow base flat point made by berrys bullets, but I cant seem to find any data on overall length for flat points such as these. any help would be appreciated. I have learned that a lot of people say that oal is gun specific, but I am also unsure as to how to find it for my gun. as for powder like I said before I am using Winchester 231...