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https://www.ballisticstudies.com/Knowledgebase/Hold+that+Forend.html........ this is a good article on the "how to" of using a backpack etc... like it or not it works,different strokes for different...

mate......for sub 150 yard shooting a big fat round nose with loads of exposed lead will see you on the money...as I said before try a box of 180 grn winchester factory stuff for your bush stalking...