i disagree . . . i will take more energy every time, its not enough is more of an issue.
the idea that all the energy must be used inside the animal, or you must have expansion etc etc heard it all before . . . it seems to me its taking the mindset of high velocity bullet techeque and trying to transfer it to subsonic shooting, there is a better way ( to me ) look to Big bore hand gunners who hunt, they operate at similar velocities.
use a BIG flat meplat and disrupt tissue, go for thru iin thru penetration, smash the shouldes, stop the lungs working . . . maybe you just need to hit them in the right place @Friwi or maybe Lehigh bullets, XTP bullets are good, cut the range down untill you get better bullet placement.
i have shot literally thousands of Goats and a few Deer with a mixture of .223s and also cast bullets at subsonic velocity over the years for pest control, using .30 & .45 calibers, tried a lot of bullet designs at close range to +200yds, thats my experience and it works for me, take it or leave it but don't try to tell me thru in thru penetration for subs is of " not much use " . .. did you notice a picture of a Fallow Deer at the start of this thread, that was flattened at 100yds . . Big bullets do that, in my experience, your mileage may differ !
R.
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