You might want to confirm the weight to volume ratio before doing this further. Its not a 5~10% difference, its more like 60% difference. That could easily result in a dramatic overload if you don't actually do a comparison & weigh an equivalent for volumne, not just a substitution.
Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”