.270 WSM with the 165 Nosler Accubond LR
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the444shooter
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I think the rub will be whether or not you've got a fast enough twist. Hope they work for you; I'll be paying attention to this thread.
You will need a 1/8 twist to be effective. I have been having really good results with RL-26 and the 165 ABLR at 3135 fps with a 26" barrel. Groups are well under 1 MOA. I am using a 270 WSM with a long throat for the Berger 170s.
the444shooter
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Playing around with *rough* estimates for bullet length, BC, and muzzle velocity, I'm showing that a 1:10 will stabilize the bullet, but that it's only marginally stable at 3200ft elevation. I punched in .625 G1 BC, 2950fps, and bullet length of 1.5" and it came up with 1.24 stability factor, and a revised BC estimate of .576. I'd like to try these out in my 270wsm that's being built right now, but at first I'm going to try the 136gr Terminal Ascents from Federal. I used the 155gr TLR in my 7mm and I think that design is a great all-around bullet.
I can help you out with info.
.277 Nosler Accubond Long Range
Length 1.517
G1 .591
.277 Nosler Accubond Long Range
Length 1.517
G1 .591
the444shooter
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Awesome--thank you!
So with that info, it's at 1.2 stability factor, revised G1 BC of .538. Still using 2950fps, 10 twist, and 3200ft elevation.
So with that info, it's at 1.2 stability factor, revised G1 BC of .538. Still using 2950fps, 10 twist, and 3200ft elevation.
the444shooter
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I'm confused--the 150gr ABLR is supposed to have a .591 BC. I wonder which is incorrect?
That number just came off of the description of the 165 ABLR on the Nosler web site.
| Box Qty. | 100 |
|---|---|
| Caliber | 270 |
| Grain | 165 |
| Bullet Type | AccuBond Long Range |
| UPC Code | 54041548274 |
| Manufacturer | Nosler |
| Manufacturer Part Number | 54827 |
| Diameter | 0.277 |
| Ballistic Coefficient (BC) | 0.591 |
| Overall Length (OAL) (in.) | 1.390 |
| Sectional Density (SD.) | 0.279 |
| Base | Boat Tail |
Ok Something IS wrong because I measured the length that I published earlier.
I will go measure one again to make sure.
I will go measure one again to make sure.
the444shooter
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Unfortunately Nosler is never up to speed, nor snuff, in regards to their website. I was looking for 6.5 PRC info when it was announced that they would start loading for it. I clicked on the image for it, and it was 6.5 Creedmoor. When I talked to their CS rep about it, he just said that it must be a placeholder since they weren't going to load it until later in the year.
Edited to add: They've at least taken down the linked image that they had in there for 6.5 PRC ballistics.
Edited to add: They've at least taken down the linked image that they had in there for 6.5 PRC ballistics.
Calvin45
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Watching and waiting attentively! What's your twist rate? If it's the standard 1:10 I'm skeptical but really, really want to be wrong (as I have a .270 as well). It's also possible that they stabilize but being only marginally stable do not come close to realizing the bc values attainable with a more aggressive twist. Not trying to rain on your parade, really glad someone else is trying this before I spend my own money experimenting
, very much want to know how this goes for you.
the444shooter
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Looks like they've fudged some of the specs between the two weights. The 1.390 and .591 belong to the 150gr ABLR .277 on the site, and obviously your length shows otherwise. That's why I went with .625 and 1.5 as a rough guess, comparing dimensions to their other calibers in respective weights.
