I use an EazyTamp that they market as a 58.4 mm diameter. My callipers measure it at 58.5mm.
However my IMS basket is 59.08 mm inside diameter at the top and 58.40 mm inside diameter close to the bottom. So I am guessing that there is a 0.58mm gap between the side of my tamper and the basket at the top, which reduces to a 0.34mm gap midway down, and then a 0.1mm gap at the bottom.
FYI, the basket is 21.30 mm deep and the tamper base is 12.12 mm thick. There is typically 12mm distance from the rim of the basket to the top of the puck, when I dose 18g in my 18g IMS basket. So the top of the puck is just a tad closer to the bottom than half way.
Is this side gap ok, or does it contribute to channeling. Thinking that a tamper that is 58.6mm or at most 58.7mm diameter would be better. Thoughts?
If I should change tampers, is a self leveling and weight calibrated tamper still a better idea or is it overkill? Can I get a tamper with the above 58.6 or 58.7mm base?