.375 Whelen (.375-06)

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The .375 Whelen cartridge (A.K.A. 375-06) was developed in 1951 by L.R. "Bob" Wallack and named in honor of Colonel Townsend Whelen. It is a .30-06 Springfield case necked up to .375. While the .375 Whelen retains the .30-06's shoulder angle of 7' 30", an improved version was introduced with a 40' angle, providing more case capacity as well as better headspacing. The .375 Whelen Improved is favored by most.

[edit] Reloading Data

Bullet (grs.)        Powder / (grs.)     MV      ME     
200 SP               IMR4064 / 58.0     2450    2265    
235 SP               IMR4064 / 60.0     2475    3205    
270 SP               IMR4064 / 57.0     2380    3400    
300 SP               IMR4064 / 52.0     2110    2975

[edit] References

http://www.reloadbench.com/cartridges/w375whel.html