@michael458 , is this possible??? 470gr Raptors at 2300 fps from a 458 Win Mag?
At a glance I would say no, not without being well over Max Pressures, and especially in a 21-22 inch barrel as stated.
I have never tested or even fired the 500 CEB SOlids and the matching 470 Raptors. After working with the 450/420 combination first designed, I never seen any reason for the heavier bullets, regardless of cartridge capacity, and honestly, I still do not see a need for it today. Some however cannot get past the belief that a 500 gr bullet is needed for .458. So be it, no problems here. Now, the 470 Raptor IS a 500 #13 Solid just with a Hollow Cavity. Same length same bearing surface, everything.......... If seated conventionally to the top groove and crimped, it is deeper in the case than the 450/420 combination. Taking up more case capacity. Weight equals pressure as well, I have extensive work with the 450 Solids and pressure data, conventionally seated to the top groove, we can hit 2300 fps in 24 inches of gun with the 450 #13 Solid, but it is 60000 PSI to 62000 PSI. If the 470 is seated the same and the additional 20 grs of weight, the pressures will be higher just guessing at 65000 +
I just went over to their website, and did not see the 470s listed, but they did list the 450 #13 Solids and have them at 2450 fps!!!!! I am fairly suspicious of those sort of numbers to be honest. I did a pretty extensive study in 2013 with a 24 inch gun and the best we did then was 2338 fps at 62700 PSI with 72/V-N530 and 2341 fps with AA 2230 (I won't say how much, because 2013 AA 2230 IS NOT 2024 AA 2230, almost two different powders), today the same amount of AA 2230 would be a dangerous load, well over 65000 PSI........
I do not believe you can get 2450 fps with the 450 #13 Solid in 458 Winchester, without being way over Max Pressures. Not with standard load procedures and seating depths that would work in a variety of different rifles. And this also brings some suspicions concerning the 470 Raptor at 2300 fps. Then the test gun is a 21 inch barrel on top of that? Hmmmm..............
In 2022 we did some more research with 458 Winchester in a 20 inch gun, Winchester M70 of course. We were able to hit 2250-2270 fps and stay under 62000 PSI with the 450 #13s.
We did some research with 450 Barnes Solids and seating them very long at 3.577 OAL, and still could only get 2277 fps at 62000 PSI even with increased case capacity by seating long. But, we only tested this with the one powder IMR 8208. But I seriously doubt much more could have been achieved with most any powder.
In late 2022 and early 2023 we designed a 400 gr #13 Solid and testing 7 different powders, two different seating depths we managed 2418 fps with 84/TAC at 58700 PSI at 3.290 OAL. Now, any more powder bulged the case and it would not chamber. Extreme Compression. With other powders we were able to touch 2400 fps at 61000-62000 PSI. Reminder, 20 inch barrel.
Now how Arias is getting 2450 fps with the 450 #13 Solid in a 21 inch barrel and staying under Max Pressure? Mystery to me. We are fairly well equipped here, Weight equal pressure, and we cannot do that with a 400 gr Solid.
I see pretty much the same claims in 458 Lott..... 450 #13 Solid at 2575 fps?.......... We tested in 24 inch guns in 2013 9 different powders and best we could do and stay under 62000 PSI was 2450, in 2013 our velocities were limited to Chronograph 18 ft in front the muzzle, the actual muzzle velocity would most likely be closer to 2475 fps. Still a long way from 2575 fps.
I do not see where they are doing any sort of pressure data? I am pretty sure if they were capable of having some sort of magic powder, they would also have pressure equipment. I have done a lot of blending here, looking for magic powder, thus far, I have been successful in equaling some of the top end powders for various cartridges, but little success in surpassing top end powders...........
That was the long answer. LOL........
Short answer..... Is it POSSIBLE? Anything Might be possible. Likely? I would find it hard to buy without going over Max Pressures. And I would think in some cases, WAY OVER......