Is OCW real?

[big5ifty]

I think most of you are missing the point. This was NOT an OCW test, I was just looking at velocities and pressure signs. But after 10 shots at a 6% difference in charge weight I should have been in and out of two nodes according to Mr. Newberry.

Don't get caught up in the math, and try stay away from chasing numbers.

Calculations are just a sanity check to get started with.

Focus on the results on target.

All the different tests exist to try solve problems.

According to your target, there is no problem.

Start shooting in the wind now, so you can learn what wind moves how much at which distance.

 

[Coyotefurharvester]

The shot tracker shows 2 nodes, without velocity and a small sample what do you have? A good barrel.

 

[squirtgun]

It looks like Varget would be a bad choice for the 6 creed. I have a pound of H4350 I would like to try and would probably rather use. Varget has just been easier to get but pricey and a bit hard on the barrel from what I understand.

 

[squirtgun]

The shot tracker shows 2 nodes, without velocity and a small sample what do you have? A good barrel.

Maybe you missed the part where I said I shot two rounds and then adjusted the scope up for the last eight. I have the velocities. Definitely an awesome barrel so far. Thanks
gr vel
33.0 2819 not in that picture
33.2 2835 this one
33.4 2838 and this one are the first two @ .064" then adjusted scope 1/4 MOA up for the rest.
33.6 2858
33.8 2870
34.0 2892
34.2 2887
34.4 2915
34.6 2945
34.8 2949
35.0 2949

 

[Della]

I’ve run OCW with every caliber I’ve owned, 223, 6BRA, 6.5 CM, and 300 PRC and you know what I found - if done as KN describes it works.

But, you know what else I found - every charge found was dang near what is already out in the wild for the given caliber and bullet, to include seating depths.

It was fun and I shot a lot of bullets down range, but had I to do it all over - I’d start with what’s already known and save a whole lotta time and powder.

(Edit: I think the true benefit behind OCW is developing a load with different, untried powders)

 

[USMCDOC]

Maybe you missed the part where I said I shot two rounds and then adjusted the scope up for the last eight. I have the velocities. Definitely an awesome barrel so far. Thanks
gr vel
33.0 2819 not in that picture
33.2 2835 this one
33.4 2838 and this one are the first two @ .064" then adjusted scope 1/4 MOA up for the rest.
33.6 2858
33.8 2870
34.0 2892
34.2 2887
34.4 2915
34.6 2945
34.8 2949
35.0 2949

if it were me.. i think that i would try 34.5 grs and run with it..

 

[squirtgun]

I’ve run OCW with every caliber I’ve owned, 223, 6BRA, 6.5 CM, and 300 PRC and you know what I found - if done as KN describes it works.

But, you know what else I found - every charge found was dang near what is already out in the wild for the given caliber and bullet, to include seating depths.

It was fun and required a lot of bullets down range, but had I to do it all over - I’d start with what’s already known and save a whole lotta time and powder.

(Edit: I think the true benefit behind OCW is developing a load with different, untried powders)

And there inlies the problem Not a lot of data on 6x47 but enough to get started. I got into reloading at a bad time, powder choice is.......... well there's not much. Most use H4350, RL16 and some info on Varget. I've got a small stash of Varget now and found 1# of H4350 recently. I found 2 boxes of 109s (200 total) and I doubt I'll find a whole lot more anytime soon. So.... needless to say the supply is a little short. I'd like to have enough left to shoot a couple or three of gong matches.
Thanks for your input!

 

[Beiruty]

Man, you have a fantastic rifle and you do shoot straight.
Pick a load, I recommend 34.4gr load, go shoot. Do not waste your time.

 

[squirtgun]

if it were me.. i think that i would try 34.5 grs and run with it..

So far with 108 ELD-M and Berger 108s it seems to be holding about a 2" waterline at 600 with 34.2. I'm hoping these will be in the ball park.

 

[big5ifty]

There is a flat spot in velocity between 34 and 34.4 and I shot some groups at 300 yards with 34.2.

It's only a flat spot when you can repeat it over two more firings of the same brass.

 

[SecondsCount]

I own two 6x47L rifles and have found that the cartridge naturally has pretty wide nodes, and I've never tried Varget in it.

That big brake on the end may be helping to keep the barrel dampened and in the node.

 

[squirtgun]

I own two 6x47L rifles and have found that the cartridge naturally has pretty wide nodes, and I've never tried Varget in it.

That big brake on the end may be helping to keep the barrel dampened and in the node.

That's the conclusion I'm coming to as well. It's not sensitive to bullet jump either. When I was looking for a gun like this I saw a lot of comments about how finicky 6x47 is. This one definitely is not.

 

[squirtgun]

It's only a flat spot when you can repeat it over two more firings of the same brass.

That's true and I should run it over the chrono. I did the same procedure working up a load for 105s. I picked a charge of 34.8 and ran 10 over the chrono and got an SD of 4 and an ES of 12. I may take 10 rounds to the local 100 yard range this week and see.

 

[big5ifty]

One of Dan's observations in Eric's video is that the muzzle describes a figure 8.

The muzzle definitely moves, the movement has been tracked and recorded in microns by a ballistician at Somchem some decades ago. The results are recorded on page 21 of the current Somchem powder manual. The horizontal flex recorded in that instance was an order of magnitude larger than the vertical flex.

On that diagram it's not a figure 8, and there is a note that the actual flex pattern is random between barrels.

If it was always a figure 8, then would the group locations of the OCW test not juxtapose along a figure 8 ?

 

[CharlieNC]

One of Dan's observations in Eric's video is that the muzzle describes a figure 8.

The muzzle definitely moves, the movement has been tracked and recorded in microns by a ballistician at Somchem some decades ago. The results are recorded on page 21 of the current Somchem powder manual. The horizontal flex recorded in that instance was an order of magnitude larger than the vertical flex.

On that diagram it's not a figure 8, and there is a note that the actual flex pattern is random between barrels.

If it was always a figure 8, then would the group locations of the OCW test not juxtapose along a figure 8 ?

During charge weight testing I observe the horizontal poi correlates with vertical poi about 50% of the time, with an associated muzzle amplitude of a few thou. Maybe a diagonal vs eight pattern, but same principle.

 

[big5ifty]

A few thou, depending what is a few and barrel length, could mean one MOA up and one MOA down.

 

[ShtrRdy]

@squirtgun -- just curious - when you shot the incredible group with the different powder charges, did you have a Magnetospeed attached?

 

[squirtgun]

@squirtgun -- just curious - when you shot the incredible group with the different powder charges, did you have a Magnetospeed attached?

Yes, I posted the velocities. About 12 or 13 posts back.

 

[squirtgun]

Someone asked if I chono'd the charge I picked from the single round "ladder test" of 34.2gr, I did not so I went out today and chrono'd 10 rounds loaded at 34.2, 5 with Berger 108s and 5 with the same 109s seated the same as before .015" off the lands. 109s 2906fps SD 10 ES 26 and the 108s jammed .010" 2901fps SD 4 ES 11. That's within 6 0r 7 FPS of what I was expecting and put in my ballistic app. It came out of a different can and possibly different lot. I'm positive it was bought at a different time.
I think I'm very close to a decent charge, it could probably be tweeked a little for better ES and SD. But I'm not real confident my cheap scale isn't a little to blame also. I do need a better scale. I'm using the scale that came in the Rock Chucker kit.

 

[Webster]

Is OCW real, or a waste of time at 100 yards for this gun and needs testing further out? Would testing further out be valid because of conditions/environment?
I'm new to reloading and by no means a pro shooter. This is the first groups trying Berger109 Hybrids seated .015" off the lands with 10 shots in .2gr increments from 33.0gr to 35.0 using Varget. Shot over a chrono to find a starting range to test for ES/SD at and pressure signs. The first two shots are low and I adjusted the scope up a 1/4 MOA for the next eight. The ballistic-X says 9 shots but that is wrong.


View attachment 1425265

The group looks great why test any further? You must have good bench skills.