I tend to keep to myself, not because I see something no one else does, but because, I like to get my strategy in my head, so I can start the memory process. Talking with others, this way, that way, tends to throw me, then when time to shoot, I don't do it anyway I rehearsed or talked about.
I guess it really depends on how helpful the other shooters may be, or the COF at hand. Don't get me wrong I talk to others during the match.