Ideas for New .277 build

Muddyboots

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Yowser! Care to share powder you’re using?
RL26. I have posted up the load and ladder data in couple other .277 threads. I will try to locate them for link but it is recent. There is no doubt RL26 is for sure the "pixie dust" for the old .270Win! The 145ELDX was screamer too. Right now the 2 bullets I am going forward with is the 156HH which I think will be stupid fast or the EOL.
 

Starlite

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Getting bored with my 6.5 and 7mm's and up for something new. :) Got a 270 WSM that I was thinking to rebarrel to a fast twist for the heavies, but decided to just sell it and start over. Already got the 7.75 tw 400 MOD Bartlein Carbon 5R 24" #4 Bull Sporter in the pan. Didn't pull the trigger on an action yet, but leaning toward the Defiance AnTi long. Hoping to push the 156 HH over 3,200 fps but not looking to run too high on pressure. Something with some horsepower but that can realize decent potential in a 24" tube. This is a hunting rig, not a PRS high-volume project so barrel life not a chief concern. I got big guns in the 9 - 10 lb range, so I'm looking to lighten this one up a bit for a mountain rig.

So, how would you do it?

1) Cartridge? 27 Nosler? Custom?
2) Barrel: already on way (Bartlein Carbon 24" - see above)
3) Brake: leaning PK
4) Action: Defiance AnTi long?
5) Cerakote: Desert Sage
6) Jewell trigger
7) Stock (I'm leaning GW Clymr)
8) Hinged plate or DM?
9) Scope? (possibly Leupold Mark 5HD 3.6-18x44 w/GW reticle)
What velocity is the Sig fury getting?
Their brass looks like the way to go WRT higher velocity. I’d suspect the Sig is a 7 twist??
 

Plowboy85

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I definitely prefer the M5 Hawkins hinged floor plates on hunting rigs. The M5 just in case the stock or gun use is changed and a DBM becomes needed. I can’t offer much suggestion on cartridge but I too think a 0.277 caliber is becoming really interesting. The 27 Nosler sounds sexy. It would definitely be a hunting rig with a short barrel life. I have wondered before about a 300 whinny necked down. Would be on the heels of the Nosler in the 30 cal data stays true.
 

dciron

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I think you should reach your goal with a 270 WSM will a long throat. I have a reamer on file at JGS you are welcome to use the design if you want. COAL is 3.120 for a 170 EOL. I also have a 27 Nosler reamer on file that would easily reach your goal.
Awesome that you offered up your reamers.
 

Northkill

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Also, and this is down the line, you may want to look at the 140 SBDII in whatever you shoot. At comparable velocities, the 140 SBDII out of a 27 nosler outruns a 180 Berger from a 28 Nosler in every way minus about 150 ft-lbs of energy, out to 1000 yards and beyond. Pretty impressive little bullet!! We are running them this year in a couple 270 Sherman's, so by the time your build is done, we should have some terminal ballistics testing done. The hammer however, is still a fantastic bullet, not taking away from that.
Yeah, I plan to test drive those projos as well. :)
 

Northkill

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What is wrong with the 270wsm? Unless you are bored and have extra $$ to spend. I am an old retired guy on a fixed income so i cant afford any fancy Builds. Have been playing with a Winchester model 70 270wsm that i bought at a Paun Shop. Using 116 Absolute Hammers and IMR 4831 i have been getting 3300-3400.
and i am still working up.
Nothing wrong with the WSM. Like I said, just trying something new and looking for a little more horsepower to fill a "gap" in my line up. ;)
 

Northkill

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While we are all chasing extreme accuracy, single digit SD/ES, match brass, weighed cases, perfect jump, neck turn or no neck turn, crimp or no crimp, power tests, primer tests and concentricity, along comes an evolution that just may make most of our expertise moot and us obsolete. Logically, this was and is inevitable.
My next build will be for this round as soon as I can ensure a supply of quality ammo. After-all, we’ve all happily let Hornady lead us down the yellow brick road every time they introduce the next be-all, end-all super GI Joe, rail gun, kung fu 6.5mm or next gen 30 cal super cartridge and then fail to support it with ammo or brass. You know, 6.5 Credemore, 6 Credemore, 6.5 PRC, 300 PRC.
SO WHY NOT BUILD A GUN TO SHOOT A NEW ROUND THAT DOESN’T DEPEND ON BRASS SHEET MANUFACTURERS OR THE PRODUCTION OR NEW PRODUCT WHIMS OF HORNADY’s OWNER? Why not jump on injection or blow molded cases that are light years more precise and concentric than 1895 drawn brass technology. Really guys and gals, the greatest advances in brass case tech over the past 120 years has been metallurgy, weight sorting, cnc machines and drilling primer holes. Plastic or composite cases may well be a game changer. And even if it’s not this cartridge, the writing is on the wall fellow shooters. 21st century tech is about to catch up with our sport. Imagine, 1/8 moa ammo from a box that never corrodes. Imagine $.20 plastic cases that are immune to environmental concerns. And if you want to reload, imagine precision match quality cases that come in bags like shot shell hulls.
Have seen these. Anyone know the performance of the 6.8 TVCM cartridge? Not even sure if they are available for civilian use. Much less loaded with hunting projos.
 
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