We have posted some pretty big calibers in the past but this is one of the largest, and boy does it look like it packs a punch. Not sure what you would use it for, perhaps if a stray T-Rex decided to walk through your neighborhood.
YouTube user JT Custom Knives debuted this custom caliber on his channel and gave us a rundown on the specs in the description.
First-time shoulder firing my monster creation. this is with .700 cal slugs that weigh 1132gr which means you only get 6 boolits out of a pound of lead. this slug was loaded with what I would consider a mid-level load at about 1600fps starting and up around 1800fps towards the end. This can and will be loaded up to 2300fps in the future. the recoil energy of this rifle without the break is around 150 ft/lbs.
At the end of the video, they describe how powerful this gun is. It went through a quarter-inch steel plate and imbedded itself eight inches deep into a log. The bullet itself retained most of its mass which was surprising to the designers.
Defiantly, a pretty cool round, and I would not mind firing it.