any idea of the date range on this
You might check eBay. Right now they have several Hoppe's items including a Hoppe's can just like the one you have. Among the other items are several boxes of old cleaning patches that have the same address for Hoppe's on them as your item and the copyright date for the info on the box "1946." Also wording on one of the boxes mentions the items are used by the "War Dept." Putting all this together, I submit that your can likely existed in or about the WWII era, early to mid-forties.
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