I used it a couple of weeks ago in an informal match and got good results with it. I cast them out of mostly wheel weights, so didn't have a problem with nose slump. Accuracy was good at least out to 300 yards when I did my part. The weather was relatively quite warm, 90+, and the humidity was low, 10%, and had relatively no problem with leading. However I was giving it at least 10 breaths with the blow tube.
When casting I had to crank the heat up a little before quit getting wrinkles in the nose.