I have it tied off to the transom, but yes that could happen, and that would suck
Scrap lead locally is $1 or more a pound. I like the lead BB's for my sac, I am going to call local gun ranges and see if anyone has any. Pop bags are great, I actually have a few friends that have bags in their boats, but they are steel shot and I would prefer lead just for the weight vs volume. I'm guessing I will put 100 lbs of lead bb's in the bottom of my sac so it's total weight is 235-240.