That would be brutal, not just the recoil but the blast back from the ballisite cartridge...
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Here is a picture of the training manual that shows how to aim the rifle grenades on the 1903 using the rear sight ladder.
Attachment 94027
Ive seen a video of a fellow who used tape marks on his sling and by holding the sling taut with one foot and placing the butt on the ground he would have pre determined ranges.
Do you have a Ravenna Armory launcher? I have a French made one which is ok but the Ravenna one are really nice.