Toby
This is what I have.
Lee 2nd edition, 150gr Projectiles
W748 start 45.4grs max 45.4grs 2564fps
Speer Number13 150gr projectiles
W760 Start 44.0grs 2319fps max 48.0grs 2575fps (recommends to use magnum primer).
Nick Harvey 2nd edition 150gr Projectile
W760 start 46.0grs 2370fps max 50.0grs 2600fps
Lyman 48th edition 150gr Projectile
W748 start 39.0grs 2149fps max 43.5grs 2523fps
Hope that helps.
Kiwi Sapper shoots the 303 a lot and may have some better information.
What action are you loading for?
Cheers
Pete
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