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

Would you gain much or any vel with a 150gr running 2206h over 2208 in a 18" ?
I run 2208 for pretty much everything cos I have lots of it and can still get 3200 with 130 barnes out of 22'' no visible mussel flash but can see it on film. Obviously a faster powder would better suit this weight but it still goes well.

Originally Posted by veitnamcam

Would you gain much or any vel with a 150gr running 2206h over 2208 in a 18" ?
I run 2208 for pretty much everything cos I have lots of it and can still get 3200 with 130 barnes out of 22'' no visible mussel flash but can see it on film. Obviously a faster powder would better suit this weight but it still goes well.

In my suppressed 18 incher I got a max velocity with 2208 and 150gn SSTs of 2800fps with a heavily compressed 49gns. Groups around .8 of an inch at 100. With 2206H and the same pill I'm getting the same velocity with 2 grains less powder and accuracy of around .3 MOA at 100. Found 2206H better than H335 in my rifle with the 130gn TTSX also. Same velocities with less pressure signs and similar enough accuracy.

Originally Posted by Mike H

In my suppressed 18 incher I got a max velocity with 2208 and 150gn SSTs of 2800fps with a heavily compressed 49gns. Groups around .8 of an inch at 100. With 2206H and the same pill I'm getting the same velocity with 2 grains less powder and accuracy of around .3 MOA at 100. Found 2206H better than H335 in my rifle with the 130gn TTSX also. Same velocities with less pressure signs and similar enough accuracy.

Interesting.

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I think 2206H is just an all around better option in a short barrel. Much more efficient. 2208 works, just a bit of a waste as you don't get a full burn.

Have you tried back to back for velocity?

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Only in .223. Velocity gain was significant.

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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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

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

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?

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?!?

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