deewayne2003
AH legend
Lot of wisdom packed into what he’s saying and he could have gone on another two pages about it.Respectfully, nobody of note will build you a 470NE + 7x57. The only maker of quality that will make you a 470NE and 20 gauge I know of is Heym. The second set of shotgun barrels in 20 gauge is a roughly $10k upgrade. Their doubles are around $35k-$38k at present and a three year wait.
The problem is that a 470NE action is roughly the same size as a 20 gauge action, so the barrels can line up nicely. A 7x57 is so, so much smaller the 7x57 barrels would have to be over 10lbs to be thick enough to line up with the frame of a 470NE, that’s why one has never been made by any credible builder.
What you may want is a 7x65R or 7x57R double rifle with a second set of 375HH or 375 Flanged barrels. Heym will make that. Then you’d want a separate Heym in 470NE and 20 gauge. The 470NE frame would also be compatible with a barrel set in 450NE, 450/400, 375HH, 375 Flanged, 9.3x74R, or 500NE.
Keep in mind, a brand new double rifle will be made to regulate with a particular brand and model of ammunition. You need to buy a lifetime supply of that exact ammo before it goes obsolete, otherwise your brand new double rifle is nothing but a Wall hanger. When you buy a used double rifle, you can judge its regulation with a published custom load and demand proof via a photo of a test target. Thus, a used double rifle is judged by its regulation with a known-available handload and it can be reproduced indefinitely if the powder and bullet type is a common one to the market. (E.g. swift a-frame, hornady DGS / DGx)
In short, a new double rifle comes with some hazards and potential effort a used one does not come with. A used one comes with tangible proof of accuracy with a load you can source perpetually, a new one does not. A new one is justified if you want custom specs exactly to your preferences and you’re willing to pay the price tag and have the patience.
I literally stumbled across my .470 and it’s worked out well for me, my first ever African animal was a tuskless at 12 paces with a double.
My .470 kicks much less than the .458’s I’ve shot particularly because it’s appropriately weighted at 10lbs 14oz with red dot and the recoil reducers in the stock & Kickeez recoil pad; but also because of the custom load it was regulated with that uses IMR3031 powder.
My rifle shoots this custom load amazingly- my avatar pic is a R&L group at 50yds with iron sights but will also shoot Hornady factory ammo to the same point of impact and give 1” groups.
The Hornady factory loads have MUCH more recoil and listen to what @rookhaw said about ammo - you better buy loads of it and store it airtight and climate controlled if you want it to last for generations.
Also consider if your not used to a double your probably going to need 200+ rounds of ammo to get proficient, or at least I did.
Now Hornady .470 is nearly $300 per 20, but I can load full power practice loads with old stock Hornady unbonded bullets for about $50 per 20, Woodleigh RNSN for $85 per 20 and Hydro solids for $150 per 20.
But like ammo if you load your ammo, you need to buy components in mass and same lot# to ensure consistency, when I bought my .470ne and tested the load data, I immediately bought an 8lbs jug of IMR3031, a 1,000ct brick of primers dedicated solely to the .470, 500 Woodleigh RNSN & 500 Hornady DGX.
May sound like a lot but that 8lbs of powder is enough for 700rnds and it’s half empty.
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