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Thanks for the discussion guys.

So.. it seems to me like the 450 NE is a more powerful cartridge than the 450/400 3"

I'm looking at 2 guns by 2 different sellers, one being advertised as the 450ne, and the other the 450/400 3"

Is one 'better' than the other from a shooting or finding ammo point of view.

For reference, in high power cartridges, I have bolt guns in 416 rigby and 458 lott. ( 375 H&H in a single ), and 9.3x74R and 470 NE in doubles.

Thanks for the discussion and information, please continue educating me.

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I have a .450 NE. I don't have a .400 NE but have shot one.

They aren't equivalent chamberings at all. But can do similar jobs.

The .400 is around about the ideal buffalo and bovine calibre. Can be used for plains game. Can be used for elephant. Often in a somewhat lighter double rifles. Usually shoots a 400 gr or 410 gr porjectile. Calibre might vary in the ranges of .408 to .411 or even .413. In that neighbourhood. Usually shoots the 400 gr at about 2100 fps. An effective and nie milder choice for a big game rifle. Lesser powered than a .416 Rigby at least for velocity.

The .450 NE is the original ".470". The .470 came about after colonial bans of "military" calibres such as .450. Same sort of power and use. 480 gr projectile at around 2100 fps. Great choice for dangerous and big game. The start to the stopper range in my opinion. Good for buffalo and for elephant. Somewhat heavier rifles than the .400 range.

In my opinion the .450 NE in a double rifle is the epitome of the double rifle legend.

If I had a .470 I would lean to a .400 dr, unless the .450 NE dr was special for some reason. Or get rid of the .470 and buy both the .450 and .400.

Personally I could see a place in my safe for both a Jeffery .450 and a Jeffery .400.