Thanks, Andrew, for the clarification.
I'm gonna bet you there is NO bullet upset from a 69gr match bullet. Match bullets, at least the commercially produced jobs, all have heavier jackets than hunting or varmint bullets in the weight class discussed here.
There is no real "hollow-point" in a bthp match bullet, just the petals that close the jacket around the bullet core. A true hollowpoint is designed for impact controlled deformation. BTHP is just the means for the match bullet to place its weight where it is ballistically most advantageous; in the back, ahead of the boattail, on the ogive. Thus the point in hollow but totally different design and purpose.
Shoot rocks or concrete with your 69gr match bullet and you will see no "bullet upset". A hollowpoint rifle bullet, typically for highspeed varminting so it fragments and poses minimal ricochet, does not "upset"; it just blows apart. Bullet upset is common in hunting bullets and bullets are designed to upset at different levels of penetration. I think your gelatin test, if using a match 69gr bullet is showing hydrostatic shock, no upset and the hydrostatic wave builds and shows the characteristics of bullet upset.
I used to shoot 90gr Sierra HP from my .270win as a kid and blow-up water filled milk jugs. Only once in a while would recover anything except jacket fragments. A 130gr btsp would do the same trick, but never recovered a bullet. Have recovered hunting and Soft-point bullets fired into snow berms from .243 dia to .375" and they do upset and show R-P core-lokt type bullet upset and jacketing peel-back like the old magazine ad from years back. I had a frisbee full of 168smk and 75gr bthp match recovered from my gravel backdrop range. No match bullet I ever recovered showed upset or breakage. The .224 75gr would bend like pretzels, the .308 168s would simply show the rifling marks and maybe a bit of nose distortion. Lots of rock breakage from impacts, but no bullet upsets or breakage.
