r22r

I started out with a Lee Loader 40 years ago, and I bought another one to reload the .303 at the range. There is absolutely nothing wrong with a Lee loader.

Other thoughts.

Winchester cases would be my last choice for reloading and Prvi Partizan cases would be my first choice for reloading. The reason is simple the Prvi cases have a larger base diameter and the case walls are .010 thicker than ANY American made case and I consider the Prvi Partizan cases "military grade" or "heavy duty".



H-4350 is a good choice in powder, it is a slower burning powder and you have a 25 inch barrel to take advantage of the slower powders.
Hodgdon's H-4350 is made in Australiaicon and is a very good powder and is sold under the ADI name AR2209 in Oz.

Any .311 or .312 bullet will work fine I prefer the .312 Hornadys myself.

Other than getting better cartridge cases, any of the components you chose will work fine. Once you get a set of scales you can try other powders but all your scoop loads are "light" to be safely scooped without over charging.

Below is good reloading information for your .303, it keeps the pressure at or below 43,000 CUP or 46,000 PSI (traducer method) and I highly recommend the load data.

Please note that the load data below shows 48 grains of H-4350 as a max compressed load at 43,800 CUP and well below the 46,000 max pressure listed for the Enfield Rifleicon.