That looks much better than a lot of what I have seen from people making shot at home. I use a few hundred pounds every year, for skeet, and the price has certainly climbed.
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Only accurate guns are interesting.
Your lead into RV anti-freeze? Apparently that gives the most uniform roundness with pellets.Some use fabric softener .
I also use RV antifreeze, I found paying close attention to the cleanliness of the drip plate and the distance from the drip plate to the coolant is pretty important .
Cat
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Anytime I figure I've got this long range thing figured out, I just strap into the sling and irons and remind myself that I don't!