Following the instructions on Newberry's website, I ran this OCW test and came up with these results. Can you please educate me on what im seeing here and where to go next?
Thank you!
Thank you!
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Help with OCW test and what to do next.
- Thread starter clrems77
- Start date
45.6, 45.9 and 46.2 all seem to be a little low and left. 45.3 is centered but just a bit low, closer to the center. Newberry says to triangulate and pick the 3 nodes closest to the bullseye. Where I get confused is 45.3 seems to be the closest to the bull but doesn't fall between the other nodes. I would say it's the beginning of the node. Anyone have suggestions?
Are you speaking of the 44.4-45.3? I thought that was a big jump, but following the instructions that's what I came up with. Suggestions?
From my understanding you're suppose to increase, after your 3 initial increases, by 1%. 44.4 up to 45.3 is not a 1% increase. I I'm not mistaken, I believe that is what [MENTION=52667]CharlieNC[/MENTION] is trying to say.
Your node is between 45.6 and 46.2 load at 45.9 and adjust your seating depth to tighten the group. It doesn't matter how far away from the bullseye as long as the three groups POI are the same or close. There might be a lower node between 44.4 and 45.3 but I want as much velocity as I can get.
I understand this but according to Newberry, that first charge (44.4) is the stated 2% increase. I then continued with 1% increases getting the rest of the charges.
Thanks for your input NEO! I was thinking the same thing at 45.9. I'd like to keep the charge as high as possible to make the 900 yard shots easier.
Considering that nodes are often 3% apart, you can see the potential "flaw" in your test. You tested the area 45.3-46.2gr very well, but note those charges are only 2% apart. Theoretically, you could have missed the "node" entirely.
Having said that, 46.1gr could well be near your node. A scatter node might then be predicted at ~45.4 and another accuracy node ~44.7 . . . both of which are possible given your data.
Personally I try to ensure that the charge range tested in small increments is large enough to guarantee a node is captured, and gives enough data to ensure I see it. More than a 3% range is required (1.4gr in your case), and as much as 6% may prove useful (2.8gr).
Having said that, 46.1gr could well be near your node. A scatter node might then be predicted at ~45.4 and another accuracy node ~44.7 . . . both of which are possible given your data.
Personally I try to ensure that the charge range tested in small increments is large enough to guarantee a node is captured, and gives enough data to ensure I see it. More than a 3% range is required (1.4gr in your case), and as much as 6% may prove useful (2.8gr).
Thank you for your help! May I ask you what would you would recommend to be a good starting point and ending point to re-do this test? I'm going to try again to see if I can get a better reading.
You've got your node play with the seating then test at distance. There is no need to waste components this isn't benchrest.com
You could follow Neo's advice . . . or if like me you believe that no shooting is a waste of components, test some more.
Dunno what bullet or powder you are using, but if you actually follow Dan's instructions you should be ok. Check me by looking at his instructions again, but IIRC find the max load you believe in from published data, (1) down 10%, (2) then +2%, (3) +2%, and then (more) +~0.75% each until you are one load above the max you chose.
Note that if you start 10% below max, then go up 2% twice to begin your 0.3gr increments you have a range of about 6% left to cover. I often skip the 2 lowest loads, and instead make extras of the first real test load as the sighters/foulers.
Dunno what bullet or powder you are using, but if you actually follow Dan's instructions you should be ok. Check me by looking at his instructions again, but IIRC find the max load you believe in from published data, (1) down 10%, (2) then +2%, (3) +2%, and then (more) +~0.75% each until you are one load above the max you chose.
Note that if you start 10% below max, then go up 2% twice to begin your 0.3gr increments you have a range of about 6% left to cover. I often skip the 2 lowest loads, and instead make extras of the first real test load as the sighters/foulers.
I definitely like Neo's enthusiasm to get shooting quickly, but when it comes down to it, I'm more of a perfectionist and need to know my development is perfect! I actually looked back over my notes and found the mistake and why I had such a big jump in the beginning. Correction will be made and ill repost my new test.
Thank you very much for everyone's help and advice!!
Finger fucking a load at a 100 is a waste of ammo if it doesn't shoot at a 1000 or more what's the point,
Quit wasting your time at 100 yds with all this testing, if you can't get any further just shoot, if you can find longer ranges just shoot. I see people burning up barrels in testing ammo. Once you get 1/2 MOA load, load more and go shoot.
Cheers
Cheers
I appreciate everyone's thoughts! Learning load development and how to perfect it is part of the fun for me! The rounds I'm currently building will be used to shoot out to 900 yards so I'd like them to be a fast and accurate as possible. As Newberry said, a lot can be learned at 100 yards which will greatly help when taking your developments to LR.
It will be much more definitive to do a thorough job the first time, meaning less time and expense in the long run. OCW, Audette ladder, etc all offer somewhat different approaches to finding a node. What is a node? Some say it is minimizing the effects on muzzle velocity change (I find this hard to believe), others say barrel vibration (why a tuner works), Chris Long says shock wave propagation impact on the muzzle bore (not vibration). So we are trying to optimize a load to identify a node to minimize the effect on something that no one has yet to clearly define. I will say I have found using Quick Load and optimum barrel time (Chris Long) has correlated well with the node found when shooting. Too bad the barrel makers, loading companies, etc have not published anything definitive.
