Dasher Troubles...

[ab_bentley]

Built a 6 Dasher a few days ago and can not get the thing to shoot. I've tried everything I can think of. Built with a .272" nk .144" fb, .267" neck bushing on a .268" loaded neck diameter. I have tried Varget, RL15, XBR8208 powders. I can't seem to reach a peak pressure
Varget- 34.5
Xbr- 34
RL15- 35gr
I've seated as much as .020" into and that much out. With no change other than POI. I've switched primers, FED GMM, 450s, Wolf Mag, again no change other than POI.
I cut a new crown, no change, scope are screws are tight and this is a proven rifle. I've run every type of bullet i have in inventory in this thing, it'll shot them all in raged 1" group, lol. The ES/SD are single digit to very low teens. Cases are cleaned and annealed.
I'm thinking it might be the barrel, but I wanted to see if there were any more tricks i might try. This is a 3g X-caliber barrel I'm about 260rds into the barrel.

Adam

 

[savagedasher]

Built a 6 Dasher a few days ago and can not get the thing to shoot. I've tried everything I can think of. Built with a .272" nk .144" fb, .267" neck bushing on a .268" loaded neck diameter. I have tried Varget, RL15, XBR8208 powders. I can't seem to reach a peak pressure
Varget- 34.5
Xbr- 34
RL15- 35gr
I've seated as much as .020" into and that much out. With no change other than POI. I've switched primers, FED GMM, 450s, Wolf Mag, again no change other than POI.
I cut a new crown, no change, scope are screws are tight and this is a proven rifle. I've run every type of bullet i have in inventory in this thing, it'll shot them all in raged 1" group, lol. The ES/SD are single digit to very low teens. Cases are cleaned and annealed.
I'm thinking it might be the barrel, but I wanted to see if there were any more tricks i might try. This is a 3g X-caliber barrel I'm about 260rds into the barrel.

Adam

What is the twist and the bullet weight? Larry

 

[dmoran]

Built a 6 Dasher a few days ago and can not get the thing to shoot. I've tried everything I can think of. Built with a .272" nk .144" fb, .267" neck bushing on a .268" loaded neck diameter. I have tried Varget, RL15, XBR8208 powders. I can't seem to reach a peak pressure
Varget- 34.5
Xbr- 34
RL15- 35gr
I've seated as much as .020" into and that much out. With no change other than POI. I've switched primers, FED GMM, 450s, Wolf Mag, again no change other than POI.
I cut a new crown, no change, scope are screws are tight and this is a proven rifle. I've run every type of bullet i have in inventory in this thing, it'll shot them all in raged 1" group, lol. The ES/SD are single digit to very low teens. Cases are cleaned and annealed.
I'm thinking it might be the barrel, but I wanted to see if there were any more tricks i might try. This is a 3g X-caliber barrel I'm about 260rds into the barrel.

Adam

Those charges would be "over peak" in all my Dasher barrels/rifles. But regardless, 1" groups at 100 sounds like a mechanical issue of some sort. Measure the twist, switch scopes, etc...
Donovan

 

[swd]

Something touching the stock that's not supposed to? Bolt handle, trigger clearance, etc? Recoil lug seated against the bedding. When they don't shoot I go back over all the basics. If that's not it then I'd lean towards the barrel. try some fire form loads, if they don't shoot half moa or less, barrel.

 

[Wagoner]

I have seen that if your brass is over annelaled it can produce poor accuracy. A good friend had an exceptionally accurate 30br that opened up to an inch after over annealing some brass. That may be something to look into? Try a different scope too. If everything checks out its probably the barrel. You will never trust it. Bite the bullet and screw on a new one.

 

[Alex Wheeler]

If that barrel will handle 35 grains of rl-15 it might be a 25 cal What bushing did it take? Try a nk 265 bushing.

 

[dkhunt14]

What velocity are you getting with 34.5 Varget? Matt

 

[CaptainMal]

You just "cannot" be shooting 105-107 gr. bullets with over 34 gr. of Varget. Not with reasonable pressure. You say you have used all different bullets. What bullets and what twist is the barrel? What specifically are you shooting?

 

[ab_bentley]

You just "cannot" be shooting 105-107 gr. bullets with over 34 gr. of Varget. Not with reasonable pressure. You say you have used all different bullets. What bullets and what twist is the barrel? What specifically are you shooting?

All were 105gr-108gr bullets, no flat primers or hard bolt lifts, none whatsoever. No pressure indicators. I thought brass might be the culprit so yesterday I formed a few new pieces and it still did the same thing. I even went back down to 29gr and the groups would go vertical then horizontal but never tighten up. The stock is not the culprit, would put a $100 bill on that, same with the scope. Monday this gun was a 20-223 and would shoot amazing groups, in thinking i have a loose spot in the barrel, just ahead of the throat somewhere, thus the huge powder charges and no pressure. With Xbr my velocity was 3100 on the dot with the top charge and a 105 bullet with an 8 twist @ 26".

Adam

 

[MrMajestic]

AB, have you fed it any quality flat base bullets. I prefer the 88 grain Bergers or the 75 grain Sierra. If it will shoot them it may confirm your suspicion on the bore diameter consistency.

 

[tclaunch]

I`m going to say barrel is out of spec.

 

[dmoran]

I sure wouldn't waste any more expense on bullets, powder and primers. There is a mechanical problem.

• Bore scope the barrel
• Profile the barrel with a slug
• Check the stock, bedding, lug, trigger, bolt, all for contact, stress or bind.
• Action bolts touching pillars or bottoming out in the action.
• Measure the barrel for actual twist rate and bore (get labeled wrong some times).
• Try a different scope.

Good Luck
Donovan

 

[expiper]

I would put the bbl bak on the gun that shot good a few days ago and see if it will do it again,,,if so,,,,your new bbl is junk,,,,Roger

 

[snowpro440]

Can we see some targets ?

 

[savagedasher]

I can tell you if the load you have listed and the bullet weigh is correct and you haven't seen pressure the bore size must be big .
Larry

 

[ab_bentley]

Just slugged the bore, no real lose spots that i can measure, but my slug measure .2405", every single time (4x).

 

[boltfluter]

Just slugged the bore, no real lose spots that i can measure, but my slug measure .2405", every single time (4x).

That's not good. I would think it should be somewhere around .237.

Paul

 

[ab_bentley]

That's not good. I would think it should be somewhere around .237.

Paul

That would be the inverse of the groves, which should be .243".

Checked the twist, it was good, 8" to the turn.

I switched the scope, torqued it all to specs. The stock and bedding have been ruled out with a dial indicator, trigger is secure. Still not grouping worth a damn. So a few minutes ago i put a tuner on it to try and slave it into harmony, still isn't happening. Groups are erratic and not repeatable. That to me is the nail in the coffin.

Adam

 

[swd]

Time for another tube..

 

[ab_bentley]

Problem solved..