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The K&M is a great primer and the increased feel from seating you get is worth the price to me. Less slop in the feel than the Lee tray primer.

You load the K&N one primer at a time - no tray. No problem though using your fingers. If you want a more nicely machined single hand primer, the Sinclair or better still the 21st Century tool.

I hand prime individually. Have for at least thirty years. Prefer the more precise feel of a quality made single hand primer.