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Joined: Jun 2023
Posts: 45
Campfire Greenhorn
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OP
Campfire Greenhorn
Joined: Jun 2023
Posts: 45 |
Something I've been foolin' with. .338 calibre in a 585 Nyati case. 83.5gr IMR7828 SSC = 2836fps
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Joined: Apr 2011
Posts: 15,368 Likes: 13
Campfire Ranger
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Campfire Ranger
Joined: Apr 2011
Posts: 15,368 Likes: 13 |
That sucker looks awesome.
Semper Fi
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Joined: Dec 2008
Posts: 656
Campfire Regular
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Campfire Regular
Joined: Dec 2008
Posts: 656 |
What size is the rim? That Nyati case rim has been cut down.
Tony
Run it up, until you blow it up, then back it down a bit.
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Joined: Jun 2023
Posts: 45
Campfire Greenhorn
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Campfire Greenhorn
Joined: Jun 2023
Posts: 45 |
It is turned down to .590, but has also been at .532. The .590 worked better.
Same speeds as RUMs and WBYs but with up to 15% less powder. Next set of rounds will probably be with 225gr SSTs. Might hit the 3200fps with 87grs.
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Joined: Feb 2001
Posts: 8,800 Likes: 7
Campfire Outfitter
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Campfire Outfitter
Joined: Feb 2001
Posts: 8,800 Likes: 7 |
Looks like a fun project..dave
Only accurate rifles are interesting.
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Joined: Jun 2023
Posts: 77
Campfire Greenhorn
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Campfire Greenhorn
Joined: Jun 2023
Posts: 77 |
Visually it reminds me of the 243 WSSM. Neat. Would something like H1000 or IMR 8133 be too slow?
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Joined: Jun 2023
Posts: 45
Campfire Greenhorn
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Campfire Greenhorn
Joined: Jun 2023
Posts: 45 |
And therein lies a problem. The powder supply chain is spotty, so I have to use what is on my shelf. Also limited to using QuickLoad to estimate pressures, good in the regard that it tends to estimate low, but that translates into more loads fired at the low end. Prime example being the 7828 load, where QL estimates pressure to be just below max at 79.4grs, but brass and bolt indicate 83.5grs. More rounds to find max, but more shooting means more fun, so win-win.
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Joined: Mar 2006
Posts: 20,958 Likes: 3
Campfire Ranger
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Campfire Ranger
Joined: Mar 2006
Posts: 20,958 Likes: 3 |
What is the length of the case?
By the way, in case you missed it, Jeremiah was a bullfrog.
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Joined: Jun 2023
Posts: 45
Campfire Greenhorn
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Campfire Greenhorn
Joined: Jun 2023
Posts: 45 |
Case is formed at 2.081, trim is 2.070.
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Joined: Jul 2004
Posts: 5,133 Likes: 7
Campfire Tracker
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Campfire Tracker
Joined: Jul 2004
Posts: 5,133 Likes: 7 |
FINALLY !
A REAL wildcat on the Campfire !!! Most still think a 338-06 and 280AI are the cats azz on here.. redundant 60's stuff that has been done 100 million times X100
I started a similar one in 375 cal a few years ago but settled on the 500 Jeffery case due to there being no suitable "short" actions for the Nyati case diameter
My 375 Mercenary is off the full length Nyati case with a CheyTac rim diameter
Keep us updated on your progress, this is a really cool WILDCAT cartridge
"The welfare of humanity is always the alibi of tyrants".
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Joined: Jun 2004
Posts: 44,928 Likes: 18
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2004
Posts: 44,928 Likes: 18 |
It is turned down to .590, but has also been at .532. The .590 worked better.
Same speeds as RUMs and WBYs but with up to 15% less powder. Next set of rounds will probably be with 225gr SSTs. Might hit the 3200fps with 87grs. That doesn't come free.
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Joined: Jun 2023
Posts: 45
Campfire Greenhorn
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Campfire Greenhorn
Joined: Jun 2023
Posts: 45 |
Always willing to listen and learn. At what expense are you referring to?
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Joined: Jun 2023
Posts: 45
Campfire Greenhorn
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OP
Campfire Greenhorn
Joined: Jun 2023
Posts: 45 |
FINALLY !
A REAL wildcat on the Campfire !!! Most still think a 338-06 and 280AI are the cats azz on here.. redundant 60's stuff that has been done 100 million times X100
I started a similar one in 375 cal a few years ago but settled on the 500 Jeffery case due to there being no suitable "short" actions for the Nyati case diameter
My 375 Mercenary is off the full length Nyati case with a CheyTac rim diameter
Keep us updated on your progress, this is a really cool WILDCAT cartridge The forming dies used have been sized to have the ability to stop at any given bullet diameter (above .338), so a .375 or 9.3mm, etc. is possible. I wanted to continue down to 7mm, but I thought that might be pushing the envelope too far.
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Joined: Dec 2002
Posts: 26,109 Likes: 20
Campfire Ranger
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Campfire Ranger
Joined: Dec 2002
Posts: 26,109 Likes: 20 |
It is turned down to .590, but has also been at .532. The .590 worked better.
Same speeds as RUMs and WBYs but with up to 15% less powder. Next set of rounds will probably be with 225gr SSTs. Might hit the 3200fps with 87grs. That doesn't come free. Always willing to listen and learn. At what expense are you referring to? Pressure, if only obviously.
People who choose to brew up their own storms bitch loudest about the rain.
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Joined: Jun 2004
Posts: 44,928 Likes: 18
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2004
Posts: 44,928 Likes: 18 |
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Joined: Jan 2016
Posts: 3,463 Likes: 31
Campfire Tracker
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Campfire Tracker
Joined: Jan 2016
Posts: 3,463 Likes: 31 |
How is it throated ? For pressure consideration. Short and tight ? Weatherby&Creedmoor Style freebore? Antique, coned-up-breech, leade-only throat ?
Thanks to Tony for buying my .585 Nyati basic brass from Bertram. I came to my senses. I have been expecting a .585 SOCOM to be announced one of these days.
Ron aka "Rip" for Riflecrank Internationale Permanente NRA Life Benefactor and Beneficiary .458 Winchester Magnum, Magnanimous in Victory THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
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Joined: Jun 2023
Posts: 45
Campfire Greenhorn
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OP
Campfire Greenhorn
Joined: Jun 2023
Posts: 45 |
"Pressure, if only obviously." Not sure which way you're going with this. If you mean the point at which pressure signs appear, why would I go further? If you mean downloaded to reduce pressure, why would I go slow? Perhaps I am not grasping your context. Help me out with this.
"Short and tight ? Weatherby&Creedmoor Style freebore?" Not sure what a Creedmoor throat spec is, but the WBYs and RUMs use lots for gas expansion, so I guess this one does too. Not coned.
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Joined: Jun 2004
Posts: 44,928 Likes: 18
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2004
Posts: 44,928 Likes: 18 |
If you're getting a certain level of velocity with less powder then the pressure is higher. There's no free lunch.
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Joined: Jan 2016
Posts: 3,463 Likes: 31
Campfire Tracker
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Campfire Tracker
Joined: Jan 2016
Posts: 3,463 Likes: 31 |
"Short and tight ? Weatherby&Creedmoor Style freebore?" Not sure what a Creedmoor throat spec is, but the WBYs and RUMs use lots for gas expansion, so I guess this one does too. Not coned. You have a reamer drawing ? If not, you need to know how much free travel there is for a right-cylinder slug of caliber diameter moving from case mouth to first contact with rifling. QuickLOAD is notoriously absent of any allowance for throat. From your reading of the tea leaves it sounds like you must have adequate length of throat.
Ron aka "Rip" for Riflecrank Internationale Permanente NRA Life Benefactor and Beneficiary .458 Winchester Magnum, Magnanimous in Victory THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
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Joined: Dec 2002
Posts: 26,109 Likes: 20
Campfire Ranger
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Campfire Ranger
Joined: Dec 2002
Posts: 26,109 Likes: 20 |
Mathman has it exactly.
Velocity is dependent upon area under the pressure curve. Using equivalent powder burn rates, it is impossible to produce greater velocity with less powder except in a smaller combustion chamber with increased pressure.
How do you gain increased net energy with less fuel? Only by burning it faster and creating more pressure.
The "more efficient cartridge design" is myth. The facts that matter are combustion chamber volume, and mediating factors such as very slick bullets and lots of free bore. (This is why every bullet I buy gets impact plated with moly. Moly reduces chamber pressure, changes the rate of rise in the pressure curve, and lowers velocity with equal powder charge.)
What SAAMI calls safe pressure, and what I call safe pressure, and what you call safe pressure are likely not the same things. But make no mistake, if you are exceeding 300 Win Mag 180 gr bullet velocities in your 30-06 with 180 gr bullets. Well then the 30-06 is running much higher pressure than the 300 Win mag.
What you are doing is equivalent.
People who choose to brew up their own storms bitch loudest about the rain.
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