RE: Help needed with failing memory... 375 Win. Bore brass....

Recently someone mentioned the 375 Winchester Big bore brass was a good replacement parent case for a certain "Cartridge",  which if I recall correctly was the 32-40. 

The reason I thought the suggestion was made was because the 375 Brass once reformed had a smaller internal case volume by about 8 grains of water weight. ?.?.?

Am I remembering this correctly or am I living is some early form of cognitive decline...?

If my correlation (32-40) is right, does not this 375 brass at 2.08"
end up being too short of the required 2.130" for the 32-40....?

or does the reforming process make up the difference by stretching it the  375 brass the required 0.05"  

TIA

Bob