Any middle of the road charge will get you there. No need to jam or run very high pressures.
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6mm BR
- Thread starter Bugzlife19
- Start date
I haven't tried it but i would think somewhere between 29 and 29.5 would find a sweet spot..
Got out with my new Bartlein today from StraightJacket. Loaded up 25 rounds, all loads were H4895 @28.5g with a 105 Hybrid, Lapua/450’s to zero and get an idea. Shot 4 rounds, zero’d and shot the below group (shots 5-9) Pretty happy to say the least. 10 shot chrono looks solid.
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Just did a little test with RL16 and a straight BR case (Lapua). I was able to get 34gr with a drop tube to the neck/shoulder jct. and 32 w/o. Sierra's data says 31.6gr is the max but I have found their data to be way under pressured but I that will at least give me a place to start. Now I just need the barrel.
Hey fellas, got a question. Maybe it's just late and I have overlooked something but I can't figure this out.
Measurements taken using:
Dedicated dial caliper with the Whidden shoulder bump gauge.
Digital caliper with the Hornady bullet comparator.
105 Hybrids measure, .641 BTO
105 VLDs measure, .631 BTO
In the same brass (Norma) sized on the same Whidden die with the same shoulder bump measurement I am getting a .017 difference in CBTO to the point of effortless bolt fall. Firing pin & ejector removed.
105 Hybrids measure 1.802
105 VLDs measure 1.785
Is this just simply the difference in bullet geometry? While I understand each different bullet type (and some of the same type, different lot #) will always measure out with a difference, am I wrong in my reasoning that in this case I should only have a .010 difference? Should the VLD not measure out with a longer CBTO?
Measurements taken using:
Dedicated dial caliper with the Whidden shoulder bump gauge.
Digital caliper with the Hornady bullet comparator.
105 Hybrids measure, .641 BTO
105 VLDs measure, .631 BTO
In the same brass (Norma) sized on the same Whidden die with the same shoulder bump measurement I am getting a .017 difference in CBTO to the point of effortless bolt fall. Firing pin & ejector removed.
105 Hybrids measure 1.802
105 VLDs measure 1.785
Is this just simply the difference in bullet geometry? While I understand each different bullet type (and some of the same type, different lot #) will always measure out with a difference, am I wrong in my reasoning that in this case I should only have a .010 difference? Should the VLD not measure out with a longer CBTO?
Yes, different bullet geometries. Yes you are wrong in your reasoning that you should only have .010” difference.
I shot a few in my 8”twist but not many. They seemed to shoot pretty well at 100 and 1000. I was concerned of not having enough stability so I didn’t try hard. I’m going to try some in my next one that’s 7.5”.
I've used 30 grains with good success at .020 jump. An acquaintance uses 31 grains. Thats too hot for my tastes. Good luck!
Have 600 rounds that came with the rifle. All new brass. I realize it’s not as good as Lapua or Norma but what is the concern other than they don’t make it anymore?
After looking at some specs it would appear you can shoot 6mm BR Norma in a 6mm BR Rem, but not vice versa. Do I have that correct?
Understood on overall length. But the Norma brass seems a few .0001" smaller than the Rem for the specs I saw online and in the Nosler manual.
Measured some Lapua 6mm BR Norma brass and compared it to the Rem brass. Dimensions are within 0.002 of each other on the length and diameters. Looks like they will interchange.
First trip out to with the new barrel, and first time shooting 6BR today. Doing 10 three shot groups in .2gr increments over the chrono to find flat spots in velocity and POI.
I picked up an MK Machining mount to get the Magnetospeed off of the barrel. I know it still has an affect, but hopefully less of one.
The first picture was that last group I shot at 100 yards, before moving to 200 yards for the second image. My wife shot the first 200 yard group and I shot the second two. These 3 groups had a .6 grain spread, but almost no POI shift, and they’re almost the same shape too. I have a feeling this rifle might become boringly accurate.
Winds were from right to left, and my focus wasn’t really on zeroing the gun. Just collecting velocity numbers.
I picked up an MK Machining mount to get the Magnetospeed off of the barrel. I know it still has an affect, but hopefully less of one.
The first picture was that last group I shot at 100 yards, before moving to 200 yards for the second image. My wife shot the first 200 yard group and I shot the second two. These 3 groups had a .6 grain spread, but almost no POI shift, and they’re almost the same shape too. I have a feeling this rifle might become boringly accurate.
Winds were from right to left, and my focus wasn’t really on zeroing the gun. Just collecting velocity numbers.
105gr Berger Hybrids. Everyone says .020”, so that’s what it’s at right now. I’m probably going to go right to .060” and see how it prints.
I just got back from the range verifying what seemed like a potential winner for powder charge.
30.5gr of Varget.
Pics are 100, then 200. Yes, I shot a smaller group at 200 than I did at 100. I have no issues admitting that I shanked the fifth shot on each.
I'm actually using same bullet (H4895 though) and I'm seating it .060 off. My proof barrel tells me the lands were at 1.776 ('Merica!) and I'm loading at 1.716 with really good results. Although honestly it liked 1.776 too! I came up with the seat depth due to the really informative article on PRB. We shoot 5 shot groups to keep us humble. The 5th ALWAYS goes awry. Thanks for sharing!
That’s the same article I read and determined to try .060” as well.
I also have some 4895, and VV150 to tray. @orkan is onto something with H4530 which I have as well. I think he’s shooting the larger capacity variants on the BR though, but worth a shot.
My lands were at 1.802”. I was able to find them with the barrel off and extracting with my finger nail.
Thanks, you too, and I will.
I've been known to mess with a good thing more than a few times.
I run it in regular 6BR and 22BR as well as BRA... not just Dasher/BRX sized stuff. All of these little guys love H4350.
Interesting, I have a bunch of Varget and H4350 so I might experiment a little.......
Lapua brass
Federal 205m
110gr A-Tips
29.6gr Varget
.030” jump
10-shot Avg: 2,715fps
10-shot SD: 3.2fps
She’s definitely a little laggard but the recoil is nonexistent, especially with the Maverick, and the consistency is unbelievable.
Federal 205m
110gr A-Tips
29.6gr Varget
.030” jump
10-shot Avg: 2,715fps
10-shot SD: 3.2fps
She’s definitely a little laggard but the recoil is nonexistent, especially with the Maverick, and the consistency is unbelievable.
Try H4895 and you'll get there with it. I was getting 2848 with 105s in my 26" barrel
Embrace the slowness! It’s .1-.2 TOPS more wind than Dashers running 200+ fps faster. Watching trace is easy.
It might start out a little slow but give it 200 rounds or so to break in and I’d be very surprised if you weren’t in the same neighborhood.
Good luck!
I used Rl16 in my 22BR and got great velocities and low SD with it. I used 30.8 under the 88gr ELDM and was getting 3017 fps. Thinking about trying it in my new Dasher barrel too.
What velocity are you getting with the 105 and 30.5 varget? and how long is the barrel?
I had the same velocity with the same load as BLbennett1288 in my 26" 6mmBR in the summer. Mine was a little slower in the winter. It's a warm load and after a while the webb of the case became expanded enough that I had to start using a smaller die. So far I have 10 firings on the cases with tight primers pockets. It is a very consistent load and ES was 5 fps for 5 shots every time I checked over the chrono. I also got 9/10 shots into 1.5" vertical at 1000Y with that load.
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