I was going to load some .303 Britishicon.

According to the Lyman 49th Edition on Page 249:
150 Gr SP
Primer: Fed 210
H4895 Start Load 38 GR @ 2254 FPS
Maximum 42 GR @2650 FPS

Hornady 9th Edition Page 516 :
150 GR SP
Primer: Win WLR
H4895 Start load 29.9 GR @2200 FPS
Maximum 38.9 GR @ 2600 FPS

Please tell me..... Does the primer make that much difference or is there something else that I'm not aware of!

Thanks guys
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