34.5+ grains in Dasher

[AckleyImproved]

Guys shot a comp this past weekend with a Dasher It is the 3rd I have had, and the loading is nothing like the others.

I am currently at 34.5 grinas of RE-15 and I do not have pressure. Primers look great, bolt lift is fine.

Shooting moly, 103VLD's, RE-15, CCI450's, BAT 3L.

Anyone else got up tis high in charge weight? DO not try this load in your rifle!!!

I will ladder test for pressure and chrony this coming week.

This rifle is nothing like the others

Cheers

 

[canderson]

I do not think that your load is that far out of line. My friend and I both regularly shoot 33.0 to 33.5 grains of RL-15 with 105 VLD or 108 BT without the moly. My friend has shot up to 34 grains without a moly coated bullet. In the limited research that I have done on moly coated bullets, it takes more powder to get the same chamber pressure than a naked bullet. Also, shooting a 103 gr bullet should lend itself to a slightly lower chamber pressure than a 105 or 108. If you are comfortable with the looks of the brass and no hard bolt lift, keep hammering away. Both guns are also BAT actions, but 2 lugs.

 

[alf]

I've ran up to 35 grains of R-15 at 3100+ w/o pressure signs, but I still have better accuracy with Varget. I run 34.5 grains with Varget at 3050 and 105 VLD's, all moly plated, of course.

 

[eggman]

Most of my experience is with the 6 BRx and 105 VLD's but the BRX case has almost the same capacity as the Dasher case. When using my current lot of RL-15 I'm having to load .5 grs. more powder to reach the same velocity as I was loading with last year's lot of RL-15. When using Danzac coated bullets I have to load .3 to .5 grs. more powder to reach the same velocity as naked bullets. My go to load for the 6 BRx is 33 grs of RL-15 with a 105 Berger VLD at 3015 fps. Given this and from what you have said I too don't think you are pushing it too far but I'm sure you know what works in one barrel my not work in another 'identical' barrel. FWIW

Rodney

 

[swglenn]

What kind of brass life are you getting at these loads? I have shot 33+ gr of Varget but only get 3-4 loads in my BRX before I get loose pockets.

 

[Bob3700]

I have a 6mm BRX with a 30' Bartline 8 t, 5C bbl.

Currently I am shooting 33.6 gr of RL15 with a 105 Berger or 33.5 gr Varget with a 107 SMK. Both bullets are moly'ed.

Velocity with the Bergers is 3020 and the SMKs is 3010.

Primers are flat but not dangerously so. Am using Wolf SRM primers in Lapua brass.

Don't think that I could go another full grain without being way over the top on pressure.

Custom actions don't show the pressure like a RemChester. The Bat is probably smooth opening right up to the point where primers fall out of the cases!

Your chrono will tell the story.

Bob

 

[Rustystud]

One can push the Dasher and BRX 100-200 fps faster but brass life goes away rapidly. The Lapua brass is much lighter than standard 308 brass. I run 32.4- 32.5 grains Varget with naked 105s in a 31-32' barrel to get 3000-3080 fps. I easily get 15-20 reloadings out of my brass. I trim after first fire forming. I anneal after 8 reloads and retrim. I trash all my brass generally after 16 relaods.I loose a few primer bockets and a few necks in the life of a barrel. I full length size bumping only about .0015' and I body size just running the case into the body die about .0005'. The hole purose of the Dasher and BRX is accuracy, and ecconomy.

In my opinion if you are getting ejector marks and loosing primers you are shooting to hot a load or you have a dirty barrel. If you are geting preasure signs with the Dasher or BRX your barrrel life will also be declining.

If you want to shoot a 6mm 105 at over 3100fps then shoot a .243Win, 6mmRemington, 6mm/.284 they all will drive a 6mm bullet over 3100fps. Expect your barrel to only last 900-1600 rounds.

Nat Lambeth

 

[AckleyImproved]

Well a little more info...

I took the chrony to the shooting comp with me. I had not finalised the load, or really started one actually and the plan was to run a ladder test over a chrony and then load that night for teh comp the next day.

The bloody chrony wouldnt work so I went in unkown. I did have a feeling that I was down on velocity at 33.3 grains of RE-15. I loaded up rounds in 0.2 grains until I got to 34.5. I ran these and found that I still had no more pressure than the 33.3 I tried earlier. No difference at all.

I shot the comp at 500m, but also 1000yds the next day. My elevation from 500m to 1000yds was about 17.5MOA. that means when put in JBM ballistics velcoity of about 2950fps. I think this is about right.

I will load up further rounds in 0.2's and shoot over the chrony noting velocity and pressure signs with each increase.

I feel I will see pressure over the next 0.5grains.

So, right now with this rifle 34.5grains of RE-15 is not to bad. It seems equivilant to other rifles at 33grains of RE-15.

Strange????

Cheers

 

[Bob3700]

A grain more powder and you can't see any pressure signs.

Now what that tells me is that your chamber is tight and your bolt action very true.

With an extra grain of powder in that small case, pressure definitely went up. Try running the numbers in quick load and see what it tells you. You will probably be surprised at where the pressure is.

Many custom guns,actions and chambers) won't all show external pressure signs on the brass the same way so you have to be careful. If you are running 2950 fps with 34.5 of VGT, I would venture that you have a slow lot of the powder.

Right around 3000 fps +/- 50 fps should be a sweat spoot for the BRX.

Bob

 

[falconpilot]

Qiuckloads shows that 33.5 grs of RL-15 under a berger 108,my load), with the OAL of 2.350,my freebore is .104), the pressure is just over 63,000 psi..that's pushing it....after 4 firings or so, my pockets are pretty loose...I say that at 34.5 grs, your pockets will be trashed after the 2nd firing....have you double checked your scales to make sure they are right???

 

[AckleyImproved]

I have a few cases that have had 3 firings on them. Primer pockers are fine.

Rounds have been checked on a Gem scale, Lyman DPS, and Chargemaster. 34.5 grains is where I am, and believe me, no pressure.

I will load to pressue this coming week.

CHeers

 

[falconpilot]

After reading this, I went back and relooked at my QL program..Apparentlry, I had some setting adjusted other than factory default...It now shows that I can run up to 34.7 grs of RL15 before "going Red"(on a 70F day!).......I'll keep shooting my 33.3-33.5 though...running right at 60-61psi...Long brass life:0)

Cheers

 

[AckleyImproved]

At the last comp I ran my dasher at 35.1grains RL-15. It shot very well, and it was not hard on the brass.

I did a ladder test for pressure, got to 35.5 before the primer at the firingpin started to extrude. This gave a velocity of 3097fps.

http://www.accurateshooter.com/forum/index.php/topic,3733805.0.html

*****Do not try these loads in your Dasher******

Cheers

 

[alf]

After reading this, I went back and relooked at my QL program..Apparentlry, I had some setting adjusted other than factory default...It now shows that I can run up to 34.7 grs of RL15 before "going Red"(on a 70F day!).......I'll keep shooting my 33.3-33.5 though...running right at 60-61psi...Long brass life:0)

Cheers

Don't forget, AI's shooting moly plated bullets.

 

[falconpilot]

Good point! I run my numbers with naked bullets...