With the right diameter drill bit shank to prevent the arbor press from going too far down and ruining the pellet, I stand the pellet up and smash it about 1 or 1.5thou. This spreads the skirt for a tighter and consistent fit in the breech.
By smashing Exacts down from 29thou tall to 27.5thou tall, I have spread their skirts enough to get a 10% increase in fps. A 10% speed increase gives you a 21% increase in fpe, regardless of speed.
Your example is exactly what I am after. I have a particular gun that is very accurate with one type of pellet, and that one type of pellet has inconsistent head sizes. I will try and make one of your example. Photos much appreciated!
This gun shoots H&Ns good and have some good results with some other pellets but the JSB 18.1 and 15.9 give me the best results when resized. It takes a lot adjusting to get the dies just right. This is not a perfect way to getting a perfect pellet. It just makes me able to shoot pellets that I may have had to throw out.
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