You obviously shoot soft bullets. Try a monolithic, even at high speed they may shed some weight but they penetrate feet of elk and moose after smashing bones. Ive also never seen a partition explode for that matter. But other cup and core bullets do have a velocity limitation and can blow up on game.I don't think the term 'Blow up' Is the right one to use. Any Bullet may/will fragment if it hits a very tough target like a heavy shoulder bone. the only time that a bullet normally explodes/disintegrate is when it hits steel plates hard enough not to allow any penetration, And even then it doesn't "Explode".
Even a solid bullet will disintegrate and even melt it the target is tough enough. There are bullets designed to fragment on light/thin skinned game and if this type of bullet is used for larger game the outcome will most likely be fragmentation to some degree.
Sometimes even the best bullet choice may fragment and come apart in side. But depending on the total amount of penetration may/will still perform ok.
I have seen bullets hit very hard/thick bones and not penetrate into the vitals but it is fairly rare. This is where more bullet weight, Momentum and energy can make the difference.
J E CUSTOM