New Sierra 7mm bullet BC .707

[Grimstod]

This is just in from Sierras FB page. Pretty good looking bullet. I bet they are competing with Bergers new 195gr 7mm
What do you guys think?

 

[jim_k]

Looks like a LBT in the pic. Good for them!

 

[Changeling]

I'll believe it when Bryan Litz (Ballistics forum) says it's true (BC). 8)

 

[Keith Glasscock]

If the BC numbers in the picture stand up, then it would probably be the top-dog in the BC race.

With that in mind, there is a lot more to long range bullets than pure BC.

 

[mac86951]

Hmmm.... Time to build a new rifle? Perhaps... Wonder how this would do in a SAUM
Maybe I'll get Sierra to make some brass.
-Mac

 

[XTR]

Sierra greatly overstated the BCs on their "tipped Match Kings". I'm in the camp waiting to see some test results.

 

[280man]

.707 is probably not far off. I've shot them at 600 yards quite a bit and my bring up is very similar to the Berger 180 hybrids.

 

[7stubby]

looks like Grafs already has them listed on their website. Scroll to the bottom.

http://www.grafs.com/retail/catalog/category/categoryId/918?grafs_vendor_filter=94&grafs_sorting_flydown=stock_available&_swat_form_character_encoding=%C3%A4%E2%84%A2%C2%AE&_swat_form_process=grafs_sorting_form&_swat_form_serialized__swat_form_process=auRBAfJoHpPQd2FWx7MVIQ|s%3A18%3A%22grafs_sorting_form%22%3B&_swat_form_hidden_fields=fDk71VXcXJddn45*bdDhwg|a%3A1%3A{i%3A0%3Bs%3A18%3A%22_swat_form_process%22%3B}

 

[Exocet]

What is the recommended twist for these?

 

[Raythemanroe]

"Sierra Bullets is proud to introduce a new addition to the legendary MatchKing® line. Shooters around the world will appreciate the accuracy and extreme long range performance of Sierra's 7mm 183 grain HPBT (#1983). A sleek 27 caliber elongated ogive and a final meplat reducing operation (pointing) provide an increased ballistic coefficient for optimal wind resistance and velocity retention. To ensure precise bullet to bore alignment, a unique bearing surface to ogive junction uses the same 1.5 degree angle commonly found in match rifle chamber throats. This bullet requires a twist rate of 1:8” or faster to stabilize."


Ray

 

[bsumoba]

The .707 number is still lower than the .754 G1 of the 195 though...

That is interesting that they state a 1:8 twist is needed.

it is nice that you don't have to point them though.

 

[Terry]

.707 is probably not far off. I've shot them at 600 yards quite a bit and my bring up is very similar to the Berger 180 hybrids.

Rick

What twist rate are you using?

 

[Ledd Slinger]

If the BC numbers in the picture stand up, then it would probably be the top-dog in the BC race.

With that in mind, there is a lot more to long range bullets than pure BC.

Yeah like when Hornady come out with the 105gr HPBT Match bullets. "Oh they're tipped!" they said, "Oh they have a high BC!" they said...But they forgot to mention those bullets have the worst tolerances I have ever had the displeasure of measuring/weighing

Tho Sierra is no novice to making very accurate long range bullets, so I wouldnt be surprised if these are the "real deal".

 

[280man]

8.75 twist 5R Bartlein works fine

 

[Ringostar]

Sierra recommends fast twist rates. They call for an 8 twist with their 180's also. I've never had problems using 8.5 and 9 twist 32" barrels. I'm not positive, but believe that they recommend faster twists in case someone is using a shorter barrel. I have an 8.5 set up right now, and will definitely try them when available.

 

[1shot]

8 twist my a$$. I'll get my hard data from other shooters that I know and velocity of my 9 twist. Not trying to bang the gong here, but can you imagine the pressure from a 1-8 twist of that length? Just sayin' is all,
Lloyd

 

[KWeigel]

I am sure a 9 twist will be great. I love sierra bullets. Can't wait.