No, a 2 meter long block of ballistic gel cut to X dimensions (or even a water tank, as the field sports channel used to 'prove expansion'... yeah, right!) isn't going to give you the same results which are comparable to a live animal/carcass, which can vary widely even between the same species in an area.
Better to shoot different species and sizes of animals and compare them for yourself.
I have and will say that copper bullets can perform well in hand loaded cartridges, but the performance comparison between that and a factory loaded cartridge with the same bullet is noticeably poorer, and more expensive to boot!
Wallet not a bit lighter?
If we carry on down this path, shooting might as well become a pastime limited to those on £50k+ a year...
I prefer rough shooting to driven game.
I prefer shooting crows/pigeons to pheasants/grouse.
I prefer being out on my own (with dog in tow) and not paying for stalking, in fact, I've gone out of my way to be paid for it... which probably explains why I don't earn much!