This is an Accurate 36-185-E http://www.accuratemolds.com/bullet_detail.php?bullet=36-185E-D.png These weigh right at 190gr with my alloy. 13.5lbs Boat Anchor(COWW?) 7.5lbs .22LR alloy, and 3/8lb Sn based babbit from a saw mill. Unknown alloy. These will be shot in my Colt King Cobra 6" The bullets are sized to .3585" and are a snug fit through the throats with light finger pressure. I loaded 50 rounds with 11.0gr of 2400 in mixed .357 brass and WW small pistol primers. These fit the gun very well. Should hit pretty hard. My local range does a bowling pin match on Sundays. I have never gone but it looks like fun. This might be a good choice for that.