From what I have read IMR Red will produce similar velocities and pressure as Red Dot with same number of grains. IMR Red is more dense than Red Dot and a smaller bushing must be used to deliver 19 grains of it than you would use for 19 grains of Red Dot.
The Hornady Versalite wads can be problematic and I am not quite sure why. It seems to me they don't provide an adequate gas seal with light loads and they produce off sounding weak loads.
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