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I suspect that the Italian proof level my be the problem. It is likely the Italians consider 80 gr a service load and its proved to use that charge. The proof load for a 72 caliber using 180 grains of powder as a service load would be different I suspect. But I have no idea what the Italian proof laws are.
I suppose some research would give an idea of what the proof load is for this bore size.
IIRC historically the British had different loads for different classes of guns and a rifle would be proofed according to its "class". But I am not sure what the proof law was circa 1850.
If its stocked right 9-10 pounds will be OK hunting but will make shooting off the bench more "difficult" with 150-200 grains of powder.
Dan
IMHO the Italians simply use the old 19th century tables for BP proof. The German 1891 tables f.i. prescribed an "ordinary service charge" of 88gr BP for a 13gauge bore diameter rifle. The final proof charge was 179gr.
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Re: New Pedersoli Gibbs Afrcan Hunter .72 Rifle!