1:16 is the most common for the 350L, I think I've seen them as fast as maybe 1:12 but that's definitely not as readily available. I put my money on it's a BCA issue. In my experience with them, accuracy is less than stellar to say the least. They usually function ok.... but I couldn't hit the broadside of a barn if I was standing inside of it with some of BCA's stuff.1:16 is almost nothing for a bullet that heavy. Usually I think you'd want more like 1:7.