Well i dont know if you can count on 50 or especially 100 pounds in each arm, (unless youre a 300lb farmer or strongman) but otherwise it seems like a good plan. One could also bicep curl the bags up, then press them overhead. It would create more strength over a range of motion. Plus doing so with one hand at a time with the feet closer together would increase stength in the midsection. The exercise you describe would promote more endurance and resistance to lactic acid buildup though. But moreso just in the shoulder region.
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