Thread: Reday to find a load...advice please

Originally Posted by Beavis

Only in .223. Velocity gain was significant.

K stands to reason it should be better with lighter weights like 130 125 in 308 but Im not convinced on 150 up unless really short barreled.

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I don't think the load data between the two powders is dissimilar,

150 AR2206H 43.0 2,740 - 45.5 2,870 -
150 AR2208 44.0 2,790 - 47.0C 2,940

Who has an old 85 or 75 barrel.
Ill cut and test with both.

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Originally Posted by Proudkiwi

Ahhh, I'm not sure you really grasp the concept behind the OCW process if you think 100mtrs will be ideal.

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How do you do it ?

Here are the "original" instructions.
http://optimalchargeweight.embarqspa...ons/4529817134

Step 8 - 100 yds

Dino if your chamber.is tight you can expect pressure at lower charge weights (as seen with factory ammo you mention).you may find your sweet spot is a grain less tham amticipated as it will be hitting the pressure/speed combo.with less powder

Originally Posted by ebf

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How do you do it ?

Here are the "original" instructions.
OCW instructions - Dan Newberry's OCW Load Development System

Step 8 - 100 yds

I'll do a proper post/PM when I'm in front of my laptop. Typing longish posts on my phone ruins my life!

I haven't actually seen that link before and I can't argue with anything in it bar the distance.

Pressure, shows as speed, which shows as elevation. Hard to see any conclusive data at only 100mtrs.

Originally Posted by Proudkiwi

Pressure, shows as speed, which shows as elevation. Hard to see any conclusive data at only 100mtrs.

Your not taking into account where in the barrel whip the bullet exits . Its entirely possible for a slower bullet to impact higher.

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Originally Posted by veitnamcam

Your not taking into account where in the barrel whip the bullet exits . Its entirely possible for a slower bullet to impact higher.

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I'm not taking into account a shit load of other variables either, regardless I stand by my point.

Focusing purely on the barrel 'whip' in your example Cam, do you think you would be able to determine the effect, if any, on elevation at 100mtrs or would the holes all be so close together on every target that the data was meaningless and indecipherable?

Please don't misunderstand, I am an advocate of the OCW method, I just think that at 100mtrs the targets are going to tell you nothing at all. At 300mtrs plus, you will start to see something useful.

It really depends on your aim i guess. Is it best groups regardless of variable inputs at 100 or 1000 where es has more effect.
I don't personally own a chonograph accurate enough to get into es but sweet spot is obvious enough to me at 100 for further development.
Then its a case of how accurate do i actually need it to be and how fast do i want it.

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What rifle, caliber etc are you shooting proudkiwi ?

You're talking about holes close together. My understanding is that at least in the initial round, OCW is not about group size, but rather distance to aim point. That's why I asked the question in my other thread. VC was onto it, I did not get it, when I got a email response from Dan Newberry, he had put it in terms that I could get my head around.

I'd be gobsmacked if a rifle/shooter manages to shoot cloverleaf groups, all the same distance from aim point, using stepped loads, even at 100 m

By my reading it just a ladder test done at short range with a heap more rounds fired
You are finding a node that 3ish weights shoot similar point of impact... Exactly what a ladder does, but 3x as many rounds fired and due to being at 100 yds, the data is 1/3 of the resolution that that of a 300yd ladder test
So thus 9x the PITA?!?

Originally Posted by ebf

What rifle, caliber etc are you shooting proudkiwi ?

You're talking about holes close together. My understanding is that at least in the initial round, OCW is not about group size, but rather distance to aim point. That's why I asked the question in my other thread. VC was onto it, I did not get it, when I got a email response from Dan Newberry, he had put it in terms that I could get my head around.

I'd be gobsmacked if a rifle/shooter manages to shoot cloverleaf groups, all the same distance from aim point, using stepped loads, even at 100 m

No, I'm not talking about group size at all. OCW is basically trying to find the most forgiving node for your rifle where changes in other variables such as temp, or variations in powder throws etc etc have the least amount of impact on your POI.

All I'm saying is that at 100 mtrs the data you are looking for to base your decision on is not as clear as it is at 300mtrs plus.

Have you tried the OCW at 100? Did you get the data you wanted?

Yup, 100m, the average POI (for a group of 3) moved around, and stabilised. To me it looked like there were 2 nodes, I choose the lower one due to getting pressure signs at the higher load.

That middle load of the stabilised lot is the one I am using to do seating depth refinement.

When I'm back from Fiordland, will load another 15 of the original set and repeat @ 200 (my range max) to see if the results are much more obvious

Hi Guys

So completed my ladder looking for pressure signs, working from 44gr 2208 behind 150 interlocks, no pressure signs observed, primers all good and no ejector marks. I have not measured case head expansion dont have a micrometer.

Statistically I know this does not mean much but still was a good day out punching paper


So from the ladder test I have a question

My rifle is sighted in for 150sst factory ammo and it shoots to 1.5inches above of aim, about where the 44grain is.

The 150 interlocks have a lower BC, probably nt so relevant over 100m, but at the higher loads is the bullet probably travelling faster than the sst's as it is going over the the point of aim?

Below is a group I tried with the interlocks, not so good, pulled the 1 to the right but the rest felt good, will have to have a bit of a fiddle


Cheers Guys

Dino

mmmmm..not sure how the Sako ended up in there...enjoy...lol