I would be less concerned about harming the barrels and more concerned about cracking the stock. Those are rather stout loads, the contact points between receiver and stock are small and the wood is 105 years old. You'll probably get away with it but why take a chance. Be sure the screws holding the stock to the receiver are tight. Loose screws will lead to cracked stock.
A good rule of thumb, pressure stresses barrel, recoil stresses stock.
Show me a pheasant that is in range for those loads and I'll show you the same one is in range for 1 1/4 ounce at 1175 to 1220 fps.
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