Interestingly, for those subscribers to Handloader Magazine, an article was written in Handloader (April 2016) by John Barsness who did some in depth testing of the new, Swift Solids in a 375 H&H Magnum. It was an interesting article that described the theory behind the design, as relayed by the Swift CEO, Bill Hober. It was interesting to read also why they chose the lead core solid design over the monolithic brass or bronze bullets that have become popular as of late. Apparently, it was because lead is more compressible, and in vintage rifles (esp double) that may have nominal bore diameters that are smaller than standard, this was desirable. Apparently, the Swift CEO is a big vintage double rifle nut, and wanted a bullet than would function well in those as well. Anyways, a very well written article.
Overall, the bullets received a glowing review from Mr. Barsness, and more interestingly, he was able to get the Swift Solids to impact very close to the same POI as the Swift A-frames with an equal charge of IMR 4350. The bullets penetrated very well (better as compared to a traditional RN FMJ solid and a flat-point monolithic solid they were compared against), and more importantly straight, which was theorized to occur as a result of cavitation from the cup-point design of the tip. Furthermore, Mr. Hober, several PH's, and hunters have used these solids in Africa in 2015/2016, and the field reports, at least as relayed by Mr. Hober (take it for what it's worth), is very positive.
Anyway, it was an interesting read.....It seems like these would be dandy for those that love the Swift A-frames as their "soft" bullet. They are supposed to be offered in diameters of 9.3 mm and up whenever they are released to the masses....