I had not thought about the Matrix bullets, thank you for bringing that up. Anyone have any measurements on a 165 / 175 Matrix .277?
As for the modest FPS and Ft.Lbs I was really just "worst case" thinking so I could compare things in JBM and still have numbers that would push me one way or the other.
I had a 300WM for several years and shot the 208 / 210s out of it. I like to shoot a fair bit, and by about the 40 to 50 rounds down range mark those 200gr.+ pills were beginning to take a toll. I would like to have just a tad bit less recoil. I have considered a brake, and that idea is still very much on the table.
All in all it seems like with these new super bullets the .277 cal. really has a nice overall balance to offer up for shooters. Not saying it is magic snake oil..
It would be Really Nice to retain 2000 Fps and 1000 Ft.Lbs + out to 1k or just a bit farther. The remaining energy seems easily there, just the Fps to ensure proper bullet expansion etc.
Fun with numbers... *IF* I maintain my 3.340" COAL limitation then the base of the 1.52" bullet would be at 1.82" from the head of the case. Ouch
Conversely the .270 WSM neck / shoulder junction is located at 1.824, and the actual shoulder / case body junction at 1.664. Now the listed OAL is only 2.860 Vs. a standard LA of 3.340. So, if I take 1.82 as the base of the bullet, then add in the length of the boat tail, I get the location of the Bullet Shank / Neck Shoulder Junction. From there I can decide on how much Neck Length I want, and come up with a OAL Brass Length. For kicks, the 270 Win has a neck length of .384.
-- So, 1.82" + Approximately .23"-ish boat tail length = 2.05" Neck / shoulder junction.
-- 2.05" + .384" = 2.434" OAL brass length.
The problem at the moment is I have too many assumptions and not enough hard numbers bullet wise.
It would be nice to be able to load to COAL and have a 170 gr. Hybrid about .015 off the lands and not worry about possible doughnut problems
I know that is being kinda lazy... but the main focus is Hunting .. ;) Less Problems by design = a good thing.
Now for a more esoteric consideration. Does anyone know for sure what the throat leade angle on the old M96 Swede's were? I Think it is .5*, but am having a hard time pinning that down. I love how my original M96 was so easy to tune loads for. I figure those Swede's must have known something when they chose the setup they did.
The extra case capacity should give a bit of a velocity boost which will be nice. I have 24 Lbs. of H1000 sitting here waiting for a Party to Go-To
Most important to me is an over all elegant design that just happens to be a Hammer!
Thoughts and Information are more than welcome,