6Dasher First OCW work up

[ctimgo]

Here is the first round of OCW with my new 6dasher. Any Ideas as to where I should stick with?

 

[Tim Singleton]

What does OCW mean?

What distance is this testing ? How many firings on this brass ? Bullet jammed or jumped? Do you use a chronograph? What type of rest are you shooting from?
My Dasher testing looked a lot like this at 100 until the 3 rd firing then things tightened up a lot. The node was easier to see.
That maybe the issue here idk.

 

[ShootDots]

To me it looks like Target #4 / 32.75 BUT work with seating depth, then primers... You should have it down quickly..

 

[ctimgo]

Only 20 rounds down new barrel. This is the second firing on the brass. First round was fire forming the brass. Bullet loaded to touch rifling. Shots were at 100 yards. I used a bipod on the front and stock has a monopod built into the rear of the stock. Chrono will be here Friday. Thanks for any info.

 

[Jay Christopherson]

Looks to me like you have a possible node in the 32.0 - 32.5 range. Whether that's the node you want to be at, velocity-wise, I dunno since I don't see velocities. Those are some goofy charge weights though (31.79? 32.43?)

 

[savageshooter86]

well if you really are doing an OCW work up, then #2 is your charge for now and work with seating depth. Then once you tighten that up re-shoot +/- 0.3 grain to verify you are in your OCW(all three charges should hit same POI and groups should be about same size)

 

[Raythemanroe]

Number three has no vertical, seating depth may pull them together!

 

[savageshooter86]

remember OP is doing an OCW test. you don't look for small groups or least vertical. Looking for 3 or more charges whose POI is same. Then chose the middle charge and work on it from there

http://optimalchargeweight.embarqspace.com/

 

[Keith Glasscock]

I'd be working between the #2 and #3 charge.

Were you holding on the center of the box or the corner? There is a little vertical POI shift from 2-3 and I'm wondering if it is rifle or hold point induced.

 

[fredhorace77]

tag

 

[Tim Singleton]

I don't think you can place a lot of value on information from the 2nd firing IMO. My Dasher brass was pretty inconsistent until the 3rd firing

 

[BoydAllen]

Are you using wind flags, and why would you handicap yourself with that rest setup? You have hard things on both ends of the rifle. I know that OCW has become the big deal, but if you optimize your rest setup and use flags you can look at horizontal characteristics of the groups as well. I would continue investigation around #3, and then start into the lands by .002, and out by .005.

 

[ctimgo]

Is the fact that I only had 20 rounds fired before doing this testing a problem. I read that it takes more rounds than that before a barrel will show its true accuracy. I know that charge weights seem off but I just didn't drop the last number when I wrote them down. Chrono will be here Friday but can anybody give me a ballpark on what velocity I am looking at if I used Number 2? Lapua brass, CCI 450, Berger VLD 105, using Varget out of a 28" Criterion barrel. Just wondering what other people are getting.

 

[ctimgo]

Boyd Allen--Here's a pic of what I'm using. I know there are better setups but I put this together as a starter with hopes of upgrading as I can afford it.

 

[BoydAllen]

Great rig. Thanks for the pic. I see your issue. You have a stock that is flat in the back, which means that you don't have much potential for adjusting your vertical point of aim by sliding the rifle on a rear bag, but you can do this by adjusting the rear monopod. If you can jury rig some sort of sandbag rest in the front, it might give better damping to the rife. Ordinarily, I would suggest using a rear sand bag that is soft enough to squeeze for sighting adjustments, but the flat butt and bipod arrangement limits your vertical fine adjustment. Even with the setup you have, I think that if you put out some sticks between you and the target, with surveyors' tape attached to their tops, long enough to reach the ground ( and try to shoot groups where shots are fired in the same condition) , that looking at your targets, your load that shows the least vertical may really do well. Bipods are more challenging to shoot, but even with easier rest setups, some dry fire practice can reap huge benefits. Getting in the zone, so to speak, and really paying attention to how you are applying pressure to the trigger is very important. There is a fellow that went by the screen name of Froggy that wrote quite a bit on this. I think that you might enjoy the article.
http://www.6mmbr.com/TacticalFroggyA1.html
If I remember correctly, your stock is pretty heavy, and quite stiff from the action through the forend. This is all good, as long as you don't have to lug it too far. Have fun, and keep us posted as to new developments. If I remember correctly there is a node at 2,950, and another a little over 100 fps above that, that are easy to reach with a Dasher, but there are a lot of shooters that are more qualified to write about this caliber.

 

[Tim Singleton]

Is the fact that I only had 20 rounds fired before doing this testing a problem. I read that it takes more rounds than that before a barrel will show its true accuracy. I know that charge weights seem off but I just didn't drop the last number when I wrote them down. Chrono will be here Friday but can anybody give me a ballpark on what velocity I am looking at if I used Number 2? Lapua brass, CCI 450, Berger VLD 105, using Varget out of a 28" Criterion barrel. Just wondering what other people are getting.

From my experience the round count on the barrel is not the problem. It's the varying blow length of the brass on 2nd firing. Do you have a comparator to measure base to shoulder of formed cases?
You can sort them to begin with to do testing. By the 3rd firing they begin to get a lot closer