Any engineered product can be designed for optimal performance under one set of conditions, but when a product must perform adequately or better under a wide range of conditions, the end result will always be a
compromise. Let's say you set your design protocols for a cartridge that must meet or exceed a base level of performance from barrel lengths ranging from 2 to 6 inches, and the bullet must also have the capacity to perform through a wide range of barriers, ranging from zero clothing/barriers, to heavy clothing and at least one intermediate barrier like sheet metal or auto glass. That is an extremely tall order. It is especially more complicated to design a hollowpoint bullet for these conditions, because the bullet will experience differential stresses as the bullet expands. This is not a job for Bubba the reloader who lives in the van down by the river. Engineering design is an iterative process. It takes many revisions and refinements, testing and re-testing under various conditions, and plotting and examining the data to achieve a desired result. There has never been, and likely never will be a "perfect" engineered product that will achieve optimal performance throughout an entire range of conditions. Keep that in mind the next time some boutique ammo company tries to convince you through various marketing efforts of the following: [more velocity and/or more ft*lbs energy automatically = better], because it is just a bit more complicated than that.
Fortunately, for the overwhelming majority of the gun/ammo buying public, the choice of self defense ammo amounts to little more than an exercise in mental masturbation, but since none of us knows whether or not we will ever need to use these products to defend ourselves, the least we should do is make an informed decision. Unfortunately, most shooters have little or no practical knowledge or understanding of the engineering design process, or the science (physics, materials) and mathematics that is behind it. The big ammo companies also don't make any effort to market their products to the private citizen, so we are mostly left to guess/hope/assume that this stuff will actually work if and when we need it. The big ammo companies are after the big LE agency contracts, thus all of their marketing, research and development, and testing dollars are geared toward satisfying that market.
As an example, take the 158 grain lead hollowpoint FBI loads from Remington, Winchester, and Federal. Each company had to compete directly with the others to try to win the big LE contracts. They certainly did not share their ideas, experiences, failures, and hard-earned successes with the competition. Each company spent A LOT of money on the engineering design and testing of their product to make sure it would perform adequately under a given range of conditions, otherwise they would not be able to offer a competetive product, and would have no chance at the big LE agency contracts. Each company did their own testing, came up with their own formulas for the lead alloy, bullet shape, BHN hardness, and velocity range that their product would perform under. Each company engineered the bullet from the ground up, and kept the component manufacturing and assembly in-house in order to maintain at least some level of quality control. It should come as no surprise that each company came up with a different, although similar result. This result was based on science, and verified through rigorous testing and data analysis. The velocity ranges are comparable, and BHN hardness is in a fairly restricted range of between 10/11 to 13/14. You can argue the merits or deficiencies of any particular offering, but each has been verified in the field that they generally performed as expected.
The assumption that any of these companies would purposely "water down" their product, and thus reduce any possible competitive advantage over the competition, or to try and avoid potential civil liabilities from people firing these cartridges in old or unsafe revolvers simply holds no merit. I will leave it at that.
As for the Buffalo Bore FBI load, they use the Rimrock bullet which has a published BHN hardness of 5 (much softer than the big 3 loads), and Buffalo Bore pushes this bullet at a significantly faster velocity than the big 3. This should immediately stand out as a red flag. Buffalo Bore certainly did not engineer this bullet, and I strongly suspect they did not do any of the rigorous (i.e. EXPENSIVE) testing that the big 3 companies did to verify their product would perform under a wide range of conditions. If Buffalo Bore did this testing, great. Why not publish the results? I for one would love to read it. I also suspect no private citizen is going to invest in 5000 to 10000 rounds (minimum) of their ammo (at the ridiculous sum of more than $1 per cartridge) to do the same type of testing that the big 3 ammo companies have already done for you.
Personally, I'll stick with a product that was engineered from the ground up, tested, and verified to work in the field, and which costs approximately half as much as the fancy boutique stuff in the blue and yellow box.