Great potential. Likely similar to the 124 HH. Be glad to hear how they do.6.5 saum 3360fps
Great potential. Likely similar to the 124 HH. Be glad to hear how they do.6.5 saum 3360fps
Sorry, just saw this....Have you tried anything in the 170 class in cup-and-core in the Max for comparison velocities?
My cousin just killed an elk with the 127 .277 bullets going 3425 fps from a .270 Sherman, and we recovered the bullet. Wasn't the greatest hit, he was in about a foot and a half of snow on a really steep hillside on a 620 yard shot, the large cow was at a hard quarter away as she was moving out quick and stopped to rest from running through the snow. A perfect hit at that angle would have been an entrance behind the ribs, so pretty hard quarter. He hit about 6-8" or so back, and made a direct hit to the femur bone. Did a ton of damage as would be expected, impact velocity was still 2530 fps, bullet was under the hide up in the rib area on the off side I believe. She went down hard on impact, then stumbled/fell to the bottom of the drainage, and he was able to put another one through the back of her head to finish her. So overall, not much of a terminal performance takeaway possible on this one, other than it seemed like a lot of energy was dumped into her, she was able to go down hill slowly and that's about it, but when I get a pic of the bullet, I'll post it up.Nobody has said anything about these for a while, you're all still out hunting perhaps, but I'm curious if anyone had any further successes or failures with the Cayugas? I have a 7mag and thinking about trying them, I have a 9 twist, so I might be stuck with 151s but I'd sure love to run the 170s. Stability calculator shows marginally stable to almost comfortably stable for 170s, comfortably stable for varying conditions for the 151s.
I ran the .284 x 170 Cayuga data through JBM Ballistics Sg calculator at 9 twist, 55 F, 25" Hg, 2990 fps and got 1.407 stability factor. That is money!Nobody has said anything about these for a while, you're all still out hunting perhaps, but I'm curious if anyone had any further successes or failures with the Cayugas? I have a 7mag and thinking about trying them, I have a 9 twist, so I might be stuck with 151s but I'd sure love to run the 170s. Stability calculator shows marginally stable to almost comfortably stable for 170s, comfortably stable for varying conditions for the 151s.
Nice. Yeah about what I was seeing on Berger. You haven't shot any 170s have you?I ran the .284 x 170 Cayuga data through JBM Ballistics Sg calculator at 9 twist, 55 F, 25" Hg, 2990 fps and got 1.407 stability factor. That is money!
I used 25" Hg based on my common barometer observations in Powell, WY. 25 being high.
No sir. My rifles are .264 and .308 caliber.Nice. Yeah about what I was seeing on Berger. You haven't shot any 170s have you?
1.4 is not good proper stability, especially for a mono. Berger themselves recommend a minimum of 1.5, and monos are even more picky. It's not just to do with accuracy, but terminal performance. The twist rate and stability are critical for proper bullet performance. I went with a 1-7.5 twist to be able to run the 170 reliably, the slowest I would go is 1-8. Stick with the 151 Cayuga for a 9 twist, otherwise be aware that if you have poor terminal performance, that's on you.I ran the .284 x 170 Cayuga data through JBM Ballistics Sg calculator at 9 twist, 55 F, 25" Hg, 2990 fps and got 1.407 stability factor. That is money!
I used 25" Hg based on my common barometer observations in Powell, WY. 25 being high.
I suppose that's possible due to the lower bulk density of copper compared to lead. It makes some sense re; gyroscopic stability.Guys copper solids don't plug and play in stability programs like lead/copper jacketed bullets.
^^^^^^^^^^^^^^^THIS 100%^^^^^^^^^^^^^^^^^^^^^^^Guys copper solids don't plug and play in stability programs like lead/copper jacketed bullets. Follow the twist rates advised by Josh at PVA. He's tested everything already.
Being monolith ignorant; I'm curious, if Sg 1.5 is the approximate minimum, is there a maximum Sg factor?1.4 is not good proper stability, especially for a mono. Berger themselves recommend a minimum of 1.5, and monos are even more picky. It's not just to do with accuracy, but terminal performance. The twist rate and stability are critical for proper bullet performance. I went with a 1-7.5 twist to be able to run the 170 reliably, the slowest I would go is 1-8. Stick with the 151 Cayuga for a 9 twist, otherwise be aware that if you have poor terminal performance, that's on you.
Yes, there is a max RPM. However, don't overcomplicate it unnecessarily, follow the recommended SG as recommended (mono or not), esp. from ballisticians, and you are GTG.Being monolith ignorant; I'm curious, if Sg 1.5 is the approximate minimum, is there a maximum Sg factor?
Is it possible to spin them fast enough to cause the rifling to excessively distort the bearing surface? Such would likely destroy accuracy and foul the bore in short order. Is it possible to spin fast enough to cause meplat petals to open before impact? I suppose that depends on the specific copper alloy used. Or would pressure get too high before that many rpm is generated?
Every system has its limits.
Seems the bullet manufacturers might have some applicable R&D experience. I'm looking for physical sciences or personal observation based responses. I have not researched monolithic bullets beyond reading personal observations on LRH.
Dang! Now I have to look at monoliths to see what kind of Sg the mfrs are recommending. If any are other than the Sg 1.5 you posted re; Berger.1.4 is not good proper stability, especially for a mono. Berger themselves recommend a minimum of 1.5, and monos are even more picky. It's not just to do with accuracy, but terminal performance. The twist rate and stability are critical for proper bullet performance. I went with a 1-7.5 twist to be able to run the 170 reliably, the slowest I would go is 1-8. Stick with the 151 Cayuga for a 9 twist, otherwise be aware that if you have poor terminal performance, that's on you.
Didnt see any Sg on the PVA site. Only twist rates. Are many mfrs publishing Sg?Yes, there is a max RPM. However, don't overcomplicate it unnecessarily, follow the recommended SG as recommended (mono or not), esp. from ballisticians, and you are GTG.