6br bullet selection.

[iukamedic]

I have had so much fun with the 6mm cartridge. I now have a 6br and it’s gonna be a shooter. It’s An 8 twist brux mounted to an origin action. It Shoots the 95 vld well but I don’t seem to have very much in the neck. I made some samples from 95 classic hunter and 90 eldx. The 90 eldx seems to be just ahead of the nsj and the 95 is right at it. I guess my question is are there other alternatives in the 90 grain range that might fit my case better? The intention is to shoot 100 to 300. I dont know the freebore of hand but the pictures are at 20 thousandths of jam. The bullets shown are 95vld 87vld and 90eldx. Thanks ahead of time.

 

[Clancy]

The 88 gr berger might work. Never shot them myself, but they’re a flat base and I have seen many good groups shot with them.

 

[expiper]

what is the freebore of your chamber ??? how much shank is in the ctg ???...as long as you have ~.100" you will be fine,,Roger

 

[HTSmith]

I’m not seeing a problem. Go shoot. I would try 105 VLD since your 8 twist is perfect for them. Also have you tried any other searing depths? Not saying .020” jam isn’t best, but that is a lot. Enjoy!

 

[Albany Mountain]

Your seating areas look fine to me.

 

[iukamedic]

Thanks for the replies. I mocked up a 107 also and the bullet was at the neck shoulder junction. The 95 classic was about the same place. I’m just learning some of this stuff. When I had The barrel chambered the smith had 2 reamers. I ask for the shorter of the 2. Can’t remember the numbers on that but the longer seemed excessive to me at the time. Tim, when you say .020 from jam seems a lot what does that mean? I have looked at the vast knowledge on here and studied seating depths for a while. There seems to be several different avenues for a starting point. I saw one from a Member that seemed reasonable to start from .020 from jam that’s the only reason I chose that. Seemed logical. I am open to any guidance. Thanks again for the replies.

 

[HTSmith]

Tim, when you say .020 from jam seems a lot what does that mean?

My mistake. I took that as your final "tuned" seating depth. It is a great place to start. As long as you have enough bullet shank in the neck to hold it firmly (doesn't take much) and the bearing surface doesn't go past the shoulder junction, you are good.

 

[iukamedic]

I sure appreciate it. This round is a hoot to shoot. I have Loaded for a while but it has always been for range ammo. This br shooting is more precise. Just having fun messing with different stuff. I can already see that you can probably over think a lot of this. No kidding though I sure appreciate any advice. Thanks again
-Jeff

 

[Gary C]

I shot some Berger 108 targets because that is what I could buy at the time.
The first groups out of a new Savage LRPV were in the .4 average and nothing larger than .5
The next groups were for charge tests in .030 increments and 28.3 of IMR 4895 five shot group measured .232. The first groups were 28 gr IMR 4895.
These were all loaded .010 into the lands.
If a longer bullet, say 107-108 looks better for you in the neck, why not use that?

 

[iukamedic]

I shot some Berger 108 targets because that is what I could buy at the time.
The first groups out of a new Savage LRPV were in the .4 average and nothing larger than .5
The next groups were for charge tests in .030 increments and 28.3 of IMR 4895 five shot group measured .232. The first groups were 28 gr IMR 4895.
These were all loaded .010 into the lands.
If a longer bullet, say 107-108 looks better for you in the neck, why not use that?

I worry about getting into the shoulder with those longer bullets.

 

[Webster]

I have had so much fun with the 6mm cartridge. I now have a 6br and it’s gonna be a shooter. It’s An 8 twist brux mounted to an origin action. It Shoots the 95 vld well but I don’t seem to have very much in the neck. I made some samples from 95 classic hunter and 90 eldx. The 90 eldx seems to be just ahead of the nsj and the 95 is right at it. I guess my question is are there other alternatives in the 90 grain range that might fit my case better? The intention is to shoot 100 to 300. I dont know the freebore of hand but the pictures are at 20 thousandths of jam. The bullets shown are 95vld 87vld and 90eldx. Thanks ahead of time. View attachment 1314129

I think it's an old wives tale that the base of the bullet should be near the neck/shoulder junction. Groups are all that matters. I have a 6BR 14 twist Kreiger barrel, 0.030" freebore. 68 gr bullets are half way down the neck. It's a Rem 700 BDL for GH hunting. With good bullets it shoots under .350" all day long.

 

[Gary C]

luka,
Could you explain exactly why getting into the shoulder should worry me?
I really don't know a lot about precision reloading and love to learn from those that know more than I do.
All I do know is the longer bullets seemed to shoot great for me.

 

[PopCharlie]

My 6br likes touching to about -.020. I could not get anything to shoot jambed. I had excellent results with the 95 gr. Bib flat base bullets. My rifle is a 8 twist Bartlien, on a Defiance Rebel action. It has a. 266 neck and .060 freebore. I've had excellent results with 90 to 105 gr bullets. It also shoots 68 gr Barts ultras seated at .002 off.

PopCharlie

 

[iukamedic]

luka,
Could you explain exactly why getting into the shoulder should worry me?
I really don't know a lot about precision reloading and love to learn from those that know more than I do.
All I do know is the longer bullets seemed to shoot great for me.

From what I understand it’s better to stay above the neck shoulder junction. After a few loadings you might run into pressure problems and varying velocities. That’s the best I understand about it. I have not had this happen but I’m the guy that orders a hamburger and gets a fish sandwich.

 

[Drop Port]

luka,
Could you explain exactly why getting into the shoulder should worry me?
I really don't know a lot about precision reloading and love to learn from those that know more than I do.
All I do know is the longer bullets seemed to shoot great for me.

Generally, not an issue unless your brass develops a doughnut or thickening of brass at the neck shoulder junction. Some cartridges are notorious for this brass flow condition. Years ago I learned a lesson from the 6.5x284. Mine developed a doughnut so bad that a bullet would drop freely into a fired case neck and stop at the neck shoulder junction to the point I couldn't push it past. I now set up all my chambers so the bullet bearing surface is slightly above the neck shoulder junction and never worry about doughnuts or reaming / removing them.

 

[Bill Norris]

I see absolutely nothing wrong with the seating depth in the pic above. It's a good thing to keep the pressure ring above the neck/shoulder junction when looking for best accuracy just in case the dreaded donut does appear. I never allow my bushing to size all the way down to the bottom of the neck by leaving some play in the adjustment plug.

 

[marchx]

@iukamedic I shoot a lot of 95vlds lately. What is your CBTO? I experimented with CBTO in the range 1805-1788.

 

[iukamedic]

I shoot a lot of 95vlds lately. What is your CBTO? I experimented with CBTO in the range 1805-1788.

I’m hung up on 1.755 for now. Don’t have a lot of rounds through this barrel. Been using it to hunt some. Season is over so no it’s time to just shoot.

 

[marchx]

I’m hung up on 1.755 for now. Don’t have a lot of rounds through this barrel. Been using it to hunt some. Season is over so no it’s time to just shoot.

1755 is quite short for VLDs. It's actually on par with factory Lapua ammo loaded with Scenars. My experience is that VLDs fly nicely in the 5thau-20thau range. Below a 5-shot group of 95gr VLDs.

 

[iukamedic]

1755 is quite short for VLDs. It's actually on par with factory Lapua ammo loaded with Scenars. My experience is that VLDs fly nicely in the 5thau-20thau range. Below a 5-shot group of 95gr VLDs.