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Berger's twist calculator gives a value of 1.28 for a 150 grain .277" bullet 1.39" long and travelling 2900 fps at 70 degrees and sea level from a 1:10" barrel. They classify anything from 1.0 to 1.5 as "marginal stability" and over 1.5 as reliably stable.
Who knows, maybe you don't absolutely have to have as much twist as we think to get away with a high BC. Berger recommends 1:11" for their 7mm 140, and 1:10" for their 168's. Those bullets have pretty respectable BC's and are obviously only .007" bigger in diameter...
Last edited by seven_miller; 08/05/13.
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Maybe I screwed up then.......
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Good discussion on the twist.
My concern hasn't been the twist or BC, but how well these new LR bullets do at longrange (i.e. low velocity). Nosler recommends "1300 fps" on the low-end to "unlimited" on the top. That seems like one heck of a bullet, if it really opens well at such a low velocity, yet retains weight well at high impact speeds.
For comparison, the regular Accubonds are listed as "1800 fps" and "unlimited".
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I know for a fact that a .600+ bc .277 bullet stabilizes in a 1-10" twist rifle. My brother and I have both tested the 165gr matrix bullets in 1-10 rifles both 270wsm his is a custom rifle and mine is a factory model 70 extreme weather with only a 24" barrel and there bullets stabilized just fine out to 300yards where I shoot my lader test. So the stability question is not a factory and for a hunting rifle anything over .530bc will be great it's only a matter of wind deflection after that.
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dogshooter, dude there isn't enough information I have seen to make a conclusion that nosler is way off on the BC of the bullet. in fact we have one person that tested the bullets in this thread and they tracked spot on, granted the group is kinda big for the distance and its hard to tell with certainty what the POI is.
Ran it again tonight, same schit, better story. Either I did the same wrong things as last time, or the same things right. Either way, time to mass produce....... ![[Linked Image]](http://i756.photobucket.com/albums/xx210/16bore/150ablrII004_zpsf5ecb76c.jpg)
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Still choking on the feathers from the last serving of crow....
You better pray to the God of Skinny Punks that this wind doesn't pick up......
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Has anyone shot them into milk jugs, phone books etc to see how they hold up? The accuracy and b/c reports look great! Thanks!
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Campfire 'Bwana
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Berger's twist calculator gives a value of 1.28 for a 150 grain .277" bullet 1.39" long and travelling 2900 fps at 70 degrees and sea level from a 1:10" barrel. They classify anything from 1.0 to 1.5 as "marginal stability" and over 1.5 as reliably stable.
Who knows, maybe you don't absolutely have to have as much twist as we think to get away with a high BC. Berger recommends 1:11" for their 7mm 140, and 1:10" for their 168's. Those bullets have pretty respectable BC's and are obviously only .007" bigger in diameter... Maybe the lesson here is, for those ordering a new 270 barrel, simply order a 9 twist. I have one now, a Brux, and IIRC got my first 9 twist 270 barrel back in the 80's....but did it for completely different reasons back then.
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Berger's twist calculator gives a value of 1.28 for a 150 grain .277" bullet 1.39" long and travelling 2900 fps at 70 degrees and sea level from a 1:10" barrel. They classify anything from 1.0 to 1.5 as "marginal stability" and over 1.5 as reliably stable.
Who knows, maybe you don't absolutely have to have as much twist as we think to get away with a high BC. Berger recommends 1:11" for their 7mm 140, and 1:10" for their 168's. Those bullets have pretty respectable BC's and are obviously only .007" bigger in diameter... Maybe the lesson here is, for those ordering a new 270 barrel, simply order a 9 twist. I have one now, a Brux, and IIRC got my first 9 twist 270 barrel back in the 80's....but did it for completely different reasons back then. Good point on the 1-9" twist. The last two barrels that I ordered, a Douglas in .257 Roberts and a Hart in .280 Remington, were both 1-9" simply because of the higher BC bullets that are coming available and the fact that we may be forced to go lead-free at some point in time for our hunting bullets.
Keep your gun-hand ready and your eyes peeled.
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I've been mulling over a 30-06 AI with those chubbies.....
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Move over Berger. mtmuley HILARIOUS!!! 
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Why hilarious? The BC's are holding up. Other tests show it as well. A bullet that can perform at close range and out there too. Typical Berger slut arent you? mtmuley
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Cause your funny................take a slut to know a slut  ! LMAO!!!!
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Funny. Funny is I bet you try them. Funnier is if you admit they may even be a good bullet. Maybe I'm an Accubond slut. mtmuley
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LOL..................your right I will try em and IF they shoot you can best believe I'll add them to my reloading!!!!! Just waiting on my shop to get some!!!!!!
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Good luck withthem then. I haven't had time to get the 210s past 100 yards yet. mtmuley
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What's your initial impression of the 210's? I wouldn't mind knocking the dust off my 06....
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Good luck withthem then. I haven't had time to get the 210s past 100 yards yet. mtmuley Thanks Guy................same to you!!!!!
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