First off, I didn't see anyone mentioned this so here goes.I'm shooting a CZ 550, with a 25" barrel. I use Federal #215M primers. Humm, Vhit has a starting load for the 450 gr that is greater than the max load at 400 gr. I knew they were being too conservative with the 400 gr bullet mix! And Barnes lists the 400 gr max at 105.5 gr of n560; something's not right with the Vhit mix. One of the virtues of the .416 Rigby is the size of the case, and low pressures...so I should be able to use the n560 powder and slowly, safely, move up to 2300+. If it's too hot a load, I should see signs.
DO NOT use Barnes banded solid load data for a Swift A-Frame. Barnes Banded Solids not only have relief bands cut into the shank to reduce pressure, they are also only 0.415"-0.414" in diameter. They are very low pressure and can be pushed with a good deal more powder. I would recommend getting a different powder. Alliant powders are nearly half the price of Vihtavouri (spelling?) powders and have a wide berth of different burn rates. They also make so tremendously temperature stable powders. I personally wouldn't be locked in to one powder. I would feel comfortable substituting Nosler data for Barnes because their solid is also monolithic brass and it has no driving bands, so it will produce more pressure than the barnes. Any load that is safe with the Nosler solid should be safe with the Barnes.
On the other hand, Swift A-Frames are tough bullets. Not just on impact, but just to push them down the barrel. They have a huge shank in the middle which is hard to compress, and very little give to them because of the bonding process and the thick jacket. They are true 0.416" diameter bullets which means they will need to be fully compressed by the barrel. I have actually seen people recommending using not using them in old double rifles because they could desolder ribs because of the barrel flex when they go down the bore. All I know is they will produce much higher pressure when they are used with Barnes Solid load data.
I guarantee you there are loads for both Nosler bullets and Swift bullets utilizing the same powder at something like the Rigby's rated velocity. I used Nosler's data for shooting .416 Ruger loads with everything from Woodleighs to Barnes Banded solids and I always ended up with cases exhibiting signs of very low pressure.
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