6mmbr trouble

[hepburn45110]

rifle- Savage F/Class (factory rifle) 6br
Berger 105 target bullet
Norma brass annealed
primer pockets done
cases weighed and grouped (.5gr)
cases trimmed to 1.545
Benchmark laddered up from 27 to 30
Reloader 15 laddered up from 26 to 29
bullet touching to .080 off in .020 increments
All shot in 5 shot groups


I'm having trouble with to much speed variation. The lowest was 28fps. The worst was over 100fps. I would like to be at 15fps or smaller.
Any ideas?

 

[cmillard]

i found with the bergers (vlds) that the more i jammed them the better the consistency and accuracy. .010, .015, .020--the latter was a shooter and extremely consistent

 

[mbkmkk]

i found with the bergers (vlds) that the more i jammed them the better the consistency and accuracy. .010, .015, .020--the latter was a shooter and extremely consistent

What was your OAL and the FreeBore of your rifle?

 

[bozo699]

hepburn45110,
cmillard has a good point but with the crappy weather we have been having where I live it can really foul up a chronograph,.. Sunny,cloudy,raining,50 deg/ then 75 deg. Chronographs will vary a lot in those conditions, the worst being partly cloudy/partly sunny with a little wind constantly changing the light on the chronograph, chronographs needs consistence to read consistently, hope this may help.
Wayne.

 

[Terry]

Try RL15 and Varget 29-30.5gr.

 

[cmillard]

off hand, i dont know what my OAL is, but my freebore is about .115

 

[queen_stick]

try changing primers.

what primers are you using?

 

[HPMike800]

Every time I have had high es and sd's problems it's been primers.

 

[hepburn45110]

Using CCI 450 primers

 

[in2deep]

Try Wolf primers with about 30 grains of Varget (start lower) and if that don't fix it try jumping Sierra bullets .020.
They say if that recipe don't shoot in you 6BR get a new gun and it sure shoots in my Savage. Wasted lots of rounds on ladder tests wish I tried that load first.

 

[MarkS]

hepburn45110

Fed 205GM give me the best ES 450 the highest, for me. Also how much grip do you have on the bullet. I like 0.002" Benchmark is too fast for heavy bullets. Varget and RL15 works best for me.


Mark Schronce

 

[hepburn45110]

I will implement some or all of the changes offered. Thanks.

 

[bozo699]

rifle- Savage F/Class (factory rifle) 6br
Berger 105 target bullet
Norma brass annealed
primer pockets done
cases weighed and grouped (.5gr)
cases trimmed to 1.545
Benchmark laddered up from 27 to 30
Reloader 15 laddered up from 26 to 29
bullet touching to .080 off in .020 increments
All shot in 5 shot groups


I'm having trouble with to much speed variation. The lowest was 28fps. The worst was over 100fps. I would like to be at 15fps or smaller.
Any ideas?

hepburn45110,
I know we have all give you our best answers but I am not satisfied I would like to take another stab at it. I see you annealed your brass, no pun intended but are you experienced at it?... I know my first attempt at it I couldn't get consistent seating depth's and the chronograph was all over the place,
( not 100fps ) but not very consistent. I know this has already been gone over but you seated out to .080 in .020 increments, in my experience most Bergers like to be jammed not jumped, and there finicky I think .020 at a time is way to much. I know I already touched on this but you nor did anyone else comment, chronographs work by bending light, there fore if the light isn't consistent neither will the reading's be consistent,also you have to put it the same distance from the muzzle each time to the range, ( a tape is needed ) Primers definitely make a difference but unless your mixing them I don't see 100 fps.
100fps is extreme, the 6br is known for it's consistency, I think you have something much more then a primer problem, and I think it will be a silly and simple fix when you find it, good luck to you my friend.
Wayne.

 

[fayettefatts]

How are you weighing/measuring your powder? Have you been able to achieve the desired 15fps ES when loading other calibers?

I was never really concerned with ES until I started shooting 6BR out past 600 yd. The thing that lowered my ES the most was changing to a more precise scale.

 

[hepburn45110]

bozo699

Experienced with annealing brass? No. Used a machined to anneale
Use of smaller increments for set off's noted
Never thought of light changes affecting chronograph readings
Use a marked string for chronograph distance

fayettefatts
RCBS 502 beam scales- weigh every charge- each dead on no tolerance used
Achieved single digit spreads with a 7mm mag and 45/70

MarkS
.002 grip on bullet

 

[queen_stick]

I'm surprised you're having problems with this combo: RL15/CCI 450/Berger 105VLD.

That's my 1000yd load, and may be one of the most popular long-range loads for the 6BR... it almost always works very well.

What did your target look like for each group? If you had a screamer group, but had 100fps ES, then it's likely the chrono, not the load.

 

[bozo699]

Thank you Walt, that is what I have been trying to say. A known highly accurate cartridge with a known load to shoot well in most any rifle, I can't imagine it varying 100fps, which the way I think rules out the rifle,load,and shooter. You would have to be throwing powder several grains off from case to case or mixed up primers, or maybe the cases were ruined from annealing I mean they would have to be really really bad loads to vary that bad. If 28fps was the extreme spread then I would absolutely say seating depth, primers, or the charges weren't consistent enough, but 100fps ???
Wayne.

 

[queen_stick]

Wayne, last year I got caught up in chrono speeds, and got stuck in the game of reducing my ES/SD.

What I found was I would get loads with low variations, but would shoot like ass. Then I'd put 5 shots into a group that measured in the 1's but the chrono numbers would be horrible. I couldn't get any consistent results in multiple range trips. I put the chrono away, and used the target results to determine my loads. I haven't used a chrono since then. If I get the least amount of vertical possible at 1K, then that's the load I'll stick with, regardless of how it looks at 100 yards (usually very good, but wouldn't win a 100yd match).

I blame most of the variation on my cheap chrono, so I don't even use it anymore.

 

[21shooter]

Hi Hep,My savage mod12 f-class likes, cci br4's ,( 29.1gr. 8208 70+deg )
(29.4gr. 8208 70deg or cooler ) 105 berger's , .025 off the lands.
I full lingth size the necks all the way to the sholder with my special
full lingth neck (.2675) bushing and floating die.
John www.21stcenturyshooting.com

 

[queen_stick]

John, You're adjusting your 8208 loads for temperature?

That's interesting... the selling point for that powder was that it was not temp sensitive!