What are you looking for? It's been years since I have had a Hamm's beer, so I can't remember if there is anything particular about the beer.
I brew an American Lager that is really good, I'm not sure how close it is to Hamm's. But over the years I have changed it slightly to get a certain flavor from it. Most macro American lagers have an apple character to them that I hate, so I switched yeast and ended up with Fermentis 34/70 to get rid of the apple. The last one I brewed for NHC used Wyeast 2124. So far it's one of the best of the bunch; we'll see how well it fairs this year.
I have won 2 National Homebrew Comp medals for this beer, plus a boat load in other comps. It's a little unusual in that it uses German yeast and hops; the main adjunct is Minute Rice. It's very clean, light with a hint of sweetness (but still finishes dry) and just enough bitterness to keep it interesting. I really like this beer and I try to brew 3-4 times a year. It's really good in warmer weather with a burger or brat.
Take this recipe and tinker with it until you hit the flavor your looking for. Here you go:
https://www.brewersfriend.com/homebrew/recipe/view/216382/standard-american-lager-ii-aka-lynns-lager
Edit: I'm still in Minnesota, so maybe I'll pick a six pack and check it out.