Gil Hibben, my neighbor, teacher, and mentor for knifemaking, has been making Musso Bowie knives since the 1960s or 70s. The one he made for the Expendables movies is the same pattern just with Ivory Micarta handle because Stallone wanted it to show in the lighting. Thats when Gil mentioned to Stallone the Ivory Micarta scrims just like real Ivory so Stallone sent him the artwork they were using for the film to have scrimed on the handles.
Anyway didn't mean to get off track but Gil has an old tracing of the original Musso Bowie with notes. I've got a tracing of the pattern myself from him and there are a couple little things to do if you want it to be more like the Musso Bowie. One that stands out if you know what to look for is there is actually a short hollow grind at the starting of the recasso. I actually have one of those blades started in my shop, rough ground and heat treated I really should take time to finish.