Troubles with new Dasher

[TerryPohl]

Will start out with the gun.
266 thigh neck with 104 FB.
30' 8 twist kreagar
Bat model B
MBR stock
Lenard Baity built.
33 gr. varget, 107 SMK from jam to .015 off lands from .001 to .003 neck tension. cci 450 primers. necks turned to .260 loaded round.
Have also tried 105 Amax and will not group. Have shot some .5's at 200 yards but not consistent, most are about 1 1/4'.
Cant find any RL 15 to try are 105 bergers but looking.
Any suggestions?
Thanks
Terry Pohl

 

[alf]

Terry,

I run a little more powder than you. If pressure isn't a problem yet, give it some more.

Mine seem to shoot better in the lands with a square mark on the bullet, which is around .030' or so in.

Why do you have your loaded rounds at .260 with a .266 chamber? I'd try to tighten up to a .264 loaded dimension.

Try some Federal 205's if you can find any.

You need to get some 105 Bergers.

Al

 

[Bob3700]

Terry,

I shoot a .272 no turn neck and loaded rounds are .269 so the the .006' clearance you have is a bit much and I would close it down some. Take Al's suggestion here.

Neck tension is an issue to me. I believe that light neck tension is important.

I run very light neck tension and then soft seat my bullets. Start the loaded round .020' into the lands and let the bolt handle seat the bullets. My neck tension is ususally .0005'. Just enough so that I cannot rotate the bullet in the case with my fingers.

Most are getting good results with CCI 450 or Russian SR Mag primers. I have used the Fed 205Ms and they do not tolerate higher pressures like the CCI or Russian primers.

I have had several shooters tell me that RL15 and 105 Berger VLDs are the magic ingredients. Havn't given them a good try yet but they are on my list.

Also, make sure the scope you are using is a good one. If unknown, borrow a known good scope and test again. Sometimes you will be surprised just where the chink in the armor is.

RGDS

Bob

 

[gaintwist]

I have shot a Dasher prone rifle for 3 years and can't quote a lot of groups outside of 1K prone/scope tests that are close to 1/2'. I shoot the DTAC 115 at 1k with 33.4g Vgt. Like the others have mentioned...the Russian SRM is best as R7.5 crater into firing pin hole too much with this hot load. I shot 33g R-15/105-8g bullets with outstanding results until I tried David's bullet which still holds 1/2 minute with less drift. My rounds are slipfit .266 in .268 neck chamber. I have worked with 243 AI and 6x47SM with not near the accuracy as the Dasher. It is a winner.
-lige

 

[TerryPohl]

Thanks for the info so far. I have 50 cases that need turning that I will turn to .064 and see how that works. The scope is a new Night Force BR model, but I have another new one in the safe I will change out .
Terry

 

[ANDY5]

I shot mine and had to play with the bullet depth from .010 intothe lands to .015 out and found touching was best for my gun with 33.3 Rl15 cci450. Also found 105 moly match from burgers best also I point them.

 

[MarkS]

Terry,

I shoot a 6BRX. It runs very close to the Dasher. Your neck is a little loose. Turn 10 cases to 0.264' loaded, see if make thing better, it may not.

Try some Berger's. The 108 BT. they are very good bullets and easy to tune.

Be sure you are starting in the lands as 'ALF said' know where are at all times. Don't trust any measuring device, they can lie. You need to see a square mark on the bullet. Trust me I have been there and done that.

Try some CCI BR-4 and Fed if you can find them. I have not had good luck eith the 450's.

Are you shooting over wind flags, at 200yds, you will have twice the wind movement as 100. [Moderator: See post below]. Start at 100yds, and find something that shoots, then move to 200yds.

Mark Schronce

 

[Forum Boss]

Mark has give some great advice. But he actually underestimates the effect of wind at 200 yards. Using the 'rule of the square', 200 yards is DOUBLE the distance, so the wind effect is,2x2) or four times, roughly speaking.

Running an actual calc with Point blank for 105s at 3000 fps, here is the calculated different in drift caused by a 10 mph wind:

Berger 105, 3000 fps, 10 mph wind

100-yard drift: 0.51'

200-yard drift: 2.22'

So your drift at 200 yards is two and a quarter inches vs. half an inch,assuming a 10 mph perpendicular wind).

 

[wnroscoe]

In my Dasher I run 33.3 grains of Varget, 105 Berger VLD's +.015' in the L&G with the CCI450's, 3,020 fps. It's built on a 1-8 Krieger finished at 28', .272' No turn neck with .104' free bore but I clean the necks up to 100%.

For a .266' neck I'd run .265' loaded and use a .264' bushing.

 

[TerryPohl]

Thanks for all the replies, I will let you know how things turn out. I did turn some brass last night to .264 and i will lock around Houston this week end to see if I can find some RL15.
Thanks Again.
Terry

 

[Woody]

+1 on the RL15 and Berger 105's. That is the ticket. I fireform using the Hornady 105 Amax's as it is a less expensive bullet to pull the trigger on than either the Berger or Lapua.
I use in the low 32's for powder weight, fwiw.
Woody