Opinions on the real big boys? 500J, 505 Gibbs, .500 NE, 577NE, 600NE, 700NE etc.

[Certus]

Fabulous And Unique Westley Richards .577 3" Double Rifle / The Explora - Premier Online Field Sports & Gun Journal

However, the passion for hunting elephant and buffalo (the primary recipients of these 750-grain bullets) is, if anything, increasing and

www.westleyrichards.com

Odd:
“If a reminder is needed about the performance of this beautifully built and perfectly proportioned big game stopper, the .577 NE packs 5,400 ft-lbs of energy when it delivers its 750-grain bullet at 1,800 fps. We chronographed this at between 1,830 and 1,871 fps in testing.”

 

[Wishfulthinker580]

Odd:
“If a reminder is needed about the performance of this beautifully built and perfectly proportioned big game stopper, the .577 NE packs 5,400 ft-lbs of energy when it delivers its 750-grain bullet at 1,800 fps. We chronographed this at between 1,830 and 1,871 fps in testing.”

Yea it is.

Kynoch .577 Nitro Express

Even with the shorter barrels you would think it would be around 1950 fps.

Either they load their ammo pretty tame or someone got their wires crossed somewhere.

 

[rookhawk]

Yea it is.

Kynoch .577 Nitro Express

Even with the shorter barrels you would think it would be around 1950 fps.

Either they load their ammo pretty tame or someone got their wires crossed somewhere.

Kynoch / ICI's load data from 1921 / 1926 is the gospel everyone quotes.

Lies.

A.) They used 28" test barrels and with stranded cordite they could never reproduce those speeds with 24"-27" barrels.

B.) They also lied on top of that.

Case and point: 470NE is supposed to be moving at 2150FPS. Most vintage guns regulate at 2025-2075FPS. People get themselves injured and destroy doubles all the time by trying to regulate at 2150FPS. The original pressures at the original real-world velocities were much lower.

Napkin Math: If Kynoch's liar data for 577NE was 1950fps out of a 28" barrel and you own a 25" gun, subtract 90FPS (30fps per inch) and you're at 1860fps. Then remove another 30fps because they lied and you're at 1830fps, exactly what Westley Richards says is real-world.

Does it matter? Pondoro Taylor didn't know the real-world lethargic velocities whatsoever when he published his book a century ago, he simply remarked as to which calibers were highly effective and which ones were not. ALL the storied calibers performed very well at their understated real-world velocities. The only harm that comes from the lies is that modern factory loads are made to the original published velocities (wrong) and as such they are dangerous to all vintage guns and many modern guns as well.

 

[Wishfulthinker580]

Kynoch / ICI's load data from 1921 / 1926 is the gospel everyone quotes.

Lies.

A.) They used 28" test barrels and with stranded cordite they could never reproduce those speeds with 24"-28" barrels.

B.) They also lied on top of that.

Case and point: 470NE is supposed to be moving at 2150FPS. Most vintage guns regulate at 2025-2075FPS. People get themselves injured and destroy doubles all the time by trying to regulate at 2150FPS. The original pressures at the original real-world velocities were much lower.

Napkin Math: If Kynoch's liar data for 577NE was 1950fps out of a 28" barrel and you own a 25" gun, subtract 90FPS (30fps per inch) and you're at 1860fps. Then remove another 30fps because they lied and you're at 1830fps, exactly what Westley Richards says is real-world.

Does it matter? Pondoro Taylor didn't know the real-world lethargic velocities whatsoever when he published his book a century ago, he simply remarked as to which calibers were highly effective and which ones were not. ALL the storied calibers performed very well at their understated real-world velocities. The only harm that comes from the lies is that modern factory loads are made to the original published velocities (wrong) and as such they are dangerous to all vintage guns and many modern guns as well.

No argument from me. I find it curious that Kynamco is listing the historic/conventional figure rather than what their actual modern loaded ammunition is going. You’d think they’d have their own ballistic information on their site.

 

[Pondoro]

A lot of pie in the sky regarding velocities on Kynoch ammo..

I get an average of 2048fps from 28" barrels from my .450/400 3.25 double with 1970 vintage Kynoch ammunition... splendid regulation though..

 

[grand veneur]

No argument from me. I find it curious that Kynamco is listing the historic/conventional figure rather than what their actual modern loaded ammunition is going. You’d think they’d have their own ballistic information on their site.

The reason will be primarily commercial, as was the case more than 100 years ago. Nevertheless, ammunition from Kynoch is certainly loaded at the upper limit of the permitted pressure range. This is clearly evident in the loads of the cartridge 600 Nitro Express, where an attempt was certainly made to copy the original 110gr Cordite load. I have never shot modern ammunition caliber 577 Nitro Express from Kynoch.

 

[Northern Shooter]

Anyone here chrono their 577NE?