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.

Reloading DataEdit

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


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