Originally Posted by cowboy1964
The gel isn't "churned". The path you see carved out is where the bullet has cut through. There is also going to be variability in how he slices the halves. You'll notice he uses that little pick thing to pry open the damage channel so it can be seen better.
Why do you think the maximum cavity isn't produced until several inches in? Because the bullet hasn't fully expanded yet! The damage is only being caused by what the bullet is physically touching. If temporary cavity/energy was causing damage you would see more damage at the entry point because that is where max energy is occurring but all you see is a wound track the diameter of the original caliber.
BTW, his .40 180gr HST test was one of the best for wound channel, in any weight or caliber.
.40 Federal HST 180 gr Ammo Gel Test - YouTube
What more proof? Look at one of his few videos where he shows front facing cross-sections of gel. The only damage is where the shaft of the bullet and the petals have cut through. For example, watch this starting at 3:30:
.45 ACP Federal HST 230 gr Ammo Gel Test - YouTube
BUT... the .357 Sig videos do show some evidence of the temporary cavity actually permanently deforming gel outside of the permanent cavity. So anyone dissing the .357 Sig hasn't been paying attention.
"Churned" may have been a poor word choice, but cutting is more accurate. There is more evidence of tearing at 1000+ fps. The slow moving .45 slugs simply push right through the gel. Even when he shows the cross section of the .45 rounds, there is no actual gel disruption. The sections fold back together. With the faster rounds there is some evidence of tearing in addition to cutting.
From what I've seen in his tests, 1220-1250 fps seems to be the starting point at any sort of temporary cavity damage. Still it appears to be minimal. There is more evidence of tearing and cutting though.