New 155gr 6.5mm Berger on the horizon?

[Grimstod]

How much error did he find in dopler? I assume this also effects the labradar.

I do not remember the numbers but he did say that it was so significant that it made it useless for ballistic calculations.

 

[Archer79]

It'll be nice to have more heavy options in the 6.5... right now the eldms are the only readily available bullet pushing that 150 area

 

[KMG]

It'll be nice to have more heavy options in the 6.5... right now the eldms are the only readily available bullet pushing that 150 area

Matrix 150 & 160 are quite viable. Kevin

 

[Grimstod]

Matrix 150 & 160 are quite viable. Kevin

You guys keep mentioning these but a google search yields nothing.

 

[Steveb]

www.matrixballistics.com is where you find them.

 

[Ledd Slinger]

Didn't hornady just put some money into a Doppler system to make sure their bc's were accurate...in my limited experience everything seems to jive when punched into a ballistics calculator

BC testing is all about getting the bullet down range a really long ways and measuring that performance. My guess would be that a doppler radar system wouldnt track a small projectile accurately for a very far distance. Doppler can't even predict the weather in the Rocky Mountains

Look at the 160 gr Matrix Hunting VLD bullet with a claimed G1 BC of .685. So a 147gr ELD weighing 13gr less is going to have a G1 of .697? Maybe, but I doubt it

Berger and Matrix bullets are born from competition shooters. Nobody puts more rounds downrange with more accurate rifles than competitors do.

 

[243Mendoza]

Not sure if anyone mentioned it, but Sierra has a 155gr bullet out for the past 20years. It's bc is less than their 142 but you could use its specs in Quickload to get some idea on pressures generated and velocities.

 

[284winner]

Not sure if anyone mentioned it, but Sierra has a 155gr bullet out for the past 20years. It's bc is less than their 142 but you could use its specs in Quickload to get some idea on pressures generated and velocities.

Think that may be the 308 bullet your talking about. Yes Sierra did make a 155 mk but years ago. Discontinued now and yes it wasn't built like the 142smk. I would think if Sierra built one today, it would be superior to the 142. Especially with there TMK design out.

 

[IdahoSharpshooter]

what twist...?

 

[Willie]

Ten pages of speculation. I'll just wait for the test data to come out. Til then I'll stick with the Matrix 150s & 160s.

 

[KMG]

Think that may be the 308 bullet your talking about. Yes Sierra did make a 155 mk but years ago. Discontinued now and yes it wasn't built like the 142smk. I would think if Sierra built one today, it would be superior to the 142. Especially with there TMK design out.

Or he could be thinking of the Lapua 155 Mega in 6.5. It's a traditional soft point with a .377 bc. Probably a good hunting bullet but not what you'd call a long range bullet.

 

[Grimstod]

So I originally estimated you could only get 2650fps with the 47L but looks like 2750 will be the speed you can reach. That taken into account makes it even more appealing. This fella reached 2780 on a 24in barrel. He is using H4350 of course which is yields about 100fps more then Varget will. I think I will have to build a 6.5x47 with a longer throat for this bullet.

 

[Grimstod]

Looking at the picture this bullet has the same amount of bearing surface as the 140s. Just a longer noes. So longer throat, maybe just not that much. I am thinking .185 of freebore vs my usual .175. With the 140 .175 still has a lot of bullet in the case.

 

[Ledd Slinger]

Looking at the picture this bullet has the same amount of bearing surface as the 140s. Just a longer noes. So longer throat, maybe just not that much. I am thinking .185 of freebore vs my usual .175. With the 140 .175 still has a lot of bullet in the case.

I don't run my 140s jammed in the lands anyhow. Usually about a 10 to 20 thou jump. So I might not need a longer throat to try these jammed and 10 thou off

 

[Grimstod]

Agreed, Dave Kiff tells me he thinks a .200 freebore is best for the 140 Hybrids, so with this bullet having an almost identical amount of bearing surface should be easy to build a 6.5x47 that can shoot both. We shall see where it likes to jump from. H4350 will be a must or something in the burn range.

Think about this too. Most fellas running 140 use varget and get 2750 and if you can switch to a bullet that has a much higher BC and produces the same muzzle velocity with 41-42gr of H4350 that is a win win. I am excited now and no longer skeptical.

 

[JBT47]

Agreed, Dave Kiff tells me he thinks a .200 freebore is best for the 140 Hybrids, so with this bullet having an almost identical amount of bearing surface should be easy to build a 6.5x47 that can shoot both. We shall see where it likes to jump from. H4350 will be a must or something in the burn range.

Think about this too. Most fellas running 140 use varget and get 2750 and if you can switch to a bullet that has a much higher BC and produces the same muzzle velocity with 41-42gr of H4350 that is a win win. I am excited now and no longer skeptical.

The problem I've run into using over 41gr H4350 is compressed loads. I do not like compressed loads. So, I run Viht N550. I will say that H4350 has shot well for me in spite of compression.

 

[Shane Roya]

Think that may be the 308 bullet your talking about. Yes Sierra did make a 155 mk but years ago. Discontinued now and yes it wasn't built like the 142smk. I would think if Sierra built one today, it would be superior to the 142. Especially with there TMK design out.

QL shows .264, 155, Sierra HPBT LR MatchK 9570, apparently Sierra does not make it anymore.
http://forum.accurateshooter.com/threads/sectional-density-and-long-range-bullets.3738166/
see second post down

 

[Grimstod]

The problem I've run into using over 41gr H4350 is compressed loads. I do not like compressed loads. So, I run Viht N550. I will say that H4350 has shot well for me in spite of compression.

Use a drop tibe. I have a short freebore (.167) and can get in 42 before i hit compression

 

[fredo]

Think about this too. Most fellas running 140 use varget and get 2750 and if you can switch to a bullet that has a much higher BC and produces the same muzzle velocity with 41-42gr of H4350 that is a win win. I am excited now and no longer skeptical.

If I were you, I'd remain skeptical about the associated pressure penalty likely to be encountered.
There's no "free lunch" in Physics...

 

[Grimstod]

If I were you, I'd remain skeptical about the associated pressure penalty likely to be encountered.
There's no "free lunch" in Physics...

Do you season your brass before starting load development?