Any Information........

[Lawdog]

I have checked all my books and can't find any information on the .375 Whelen/Whelen Ackley Improved.  Anyone here have data on either or both of these cartridges?  Lawdog
 

[Ramrod]

I came across this site when researching prior to purchasing my .375 H&H, here is the  Improved  Whelen page...
http://www.reloadbench.com/cartridges/w375whel.html

[Yukon Jack]

LD,
If you will PM me your email address, I can scan some info from Wolfe Publishings' Big Bore Rifles and Cartridges, also Wolfe's Wildcat Cartridges II.  I think both have articles on the 375 Whelen Imp.  Another resource would be Fred Zeglin, who makes the Hawk line of cartridges and rifles, he has a 375 Hawk which is an Improved 375 Whelen Improved (sort of, I guess).
http://www.z-hat.com/375%20Hawk.htm

Curious enough, the original 375 Whelen was originally known as the 38 Whelen.