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Just started sorting recently and I just found a 1940 Silver War Nickel

Silver War Nickels started in 1942 right ? I guess there may be a chance my coin isnt silver..

Take a look at the reverse of the coin. For 1942, if there's a big P or S above the building its a silver nickel. If thats missing, its copper/nickel. All 1943,44,45 nickels were silver composition.

Are you searching Canadian or US nickels?

I am searching Canadian nickels

War Nickels are US. Both countries had silver nickels at a point but not in 1940, im not sure of this but someone else can speak up

In Canada 5 cents are made of .800 silver 1911-1921 and .925 for 1858-1910
you can't find them in roll because they aren't the same size

From the Canadian mint http://www.mint.ca/store/mint/learn/5-cents-5300006
1922 to 1942
Composition: 99% nickel
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7

1942 to 1943
Composition: 88% copper, 12% zinc n
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7

1944 to 1945
Composition: chrome plated steel
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7

1946 to 1951
Composition: 99.9% nickel
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7

1951 to 1954
Composition: chrome plated steel
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7

1955 to 1981
Composition: 99.9% nickel
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7

1982 to 1999
Composition: 75% copper, 25% nickel
Weight (g): 4.6
Diameter (mm): 21.2
Thickness (mm): 1.76

2000 to date
Composition: 94.5% steel, 3.5% copper, 2% nickel plating
Weight (g): 3.95
Diameter (mm): 21.2
Thickness (mm): 1.76
So no silver for Canada for the war just (tombac)

The Canadian silver 5 cent is basically the same size as the US half dime, apparently the common term here was "fish scales" because the coins are so small and thin.