When you come across magazines that shows pictures of some new load being fired into a melon, write them a rude letter, cancel your subscription, and throw the magazine into the bin. Even with consistent shot placement, the results will only really be valid for that particular animal, shot in that particular place. The main thing is that if you must shoot the Sunday roast, do it while the host is still alive, or has just been killed. This applies to arteries, veins and muscle tissue. Living tissue is able to yield and stretch, often without damage, whereas dead tissue will rupture and split.
Bullets tend to deform to a greater extent than usual, and under-penetrate.
It is almost impossible to take any measurements of the temporary cavity, which would be unrealistic anyway, due to the lack of moisture and elasticity. By far the best test medium is ballistic gelatine. If prepared properly it is uniform and consistent. Bullet expansion is slightly exaggerated, but depth of penetration, and the shape and size of the temporary and permanent cavities are almost spot on. Unfortunately, ballistic gelatine is by far the most expensive and difficult to prepare of all the test media, but the realistic results are well worth it.