Thread: ADI book max’s

I would have thought of the adi book max is a compressed 26gns and I went to 26.5 with no pressure signs it will be safe enough. The book max is for good reason very conservative for good reason especially in the states no ?

Originally Posted by Nathan F

I would have thought of the adi book max is a compressed 26gns and I went to 26.5 with no pressure signs it will be safe enough. The book max is for good reason very conservative for good reason especially in the states no ?

Oh yeah I'm not judging whether or not your load is too hot, just saying that even if it is, it's not likely to actually blow the rifle up.

Originally Posted by 25/08IMP

I'm the same as Tahr I load 69 Targex and 2206 for just over 3k from a 20" and they shoot the same POA as the Targex 80grn which I also loaded with 2206 for just over 2800fps

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Is there a difference between 2206 and 2206H?

When these boys say 2206 they mean 2206H, as 2206 is no longer available

Originally Posted by gimp

When these boys say 2206 they mean 2206H, as 2206 is no longer available

Ok thanks @gimp

Originally Posted by gimp

When these boys say 2206 they mean 2206H, as 2206 is no longer available

I still have some 2206

What does the "h" stand for? I know the "sc" on some ADI powders stands for short cut.

AR2206H replaces AR2206

2007 press release

Propellant AR2206H is finally set to replace AR2206 on the Australian & New Zealand reloading market. AR2206H is an improved variation of AR2206, and is designed to optimise heavy projectile performance where it increases projectile velocity while at the same time reduces chamber pressures. It is suitable for use in a similar range of calibres and powder loads as AR2206.

AR2206H was released into the North American market in 1999, and is distributed by the Hodgdon Powder Co. under the brand name H4895. This powder has proven to be extremely popular in the USA due to its superior loading consistency and its unrivalled performance stability in severe temperature variations. Distribution to such a demanding and variable market also means that we can offer more reloading data to cover your favourite calibre-projectile combinations. Australian handloaders can now experience the many benefits of reloading with AR2206H.

Originally Posted by gimp

When these boys say 2206 they mean 2206H, as 2206 is no longer available

Yip sorry 2206 H

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Originally Posted by Nathan F

I would have thought of the adi book max is a compressed 26gns and I went to 26.5 with no pressure signs it will be safe enough. The book max is for good reason very conservative for good reason especially in the states no ?

Greetings Nathan F,
I had a look at the Hodgdon pistol data for the .223. This is for a 15 inch barrel and shows a loss of around 450 fps from a 24 inch barrel. Your 16.5 inch bareel will lose a little less but will certainly lose 300 fps or a little more. Extrapolating from the Hodgdon max to your load of 26.5 grains of H4895/ AR2206H and deducting velocity lost due to the short barrel leaves us with 2,800 fps or 2,750 fps for the max load. Something is driving up the velocity and hence pressure. I don't know if this is the projectile or the case or something else but something is doing it. Add to this the Hodgdon data you are using is very old and pressure is measured in the copper crusher mechanical system. Data for IMR 4895, quite similar to AR2206H, is measured in PSI and the loads for this projectile are a full grain less. The pressure estimate for your load of around 70,000 PSI in a previous post looks pretty good. Please don't wear a Tikka bolt shroud for the sake of a 100 fps.
Regards Grandpamac.

Thanks for the concern but pistol data is completely irrelevant. Sure it’s warm but not dangerous.

Greetings again Nathan F,
This moring I looked up the Nosler data for the .223 with 69 and 70 grain projectiles. Their listed max was 24 grains of H4895 for 2,810 fps in a 20 inch barrel and a Nosler case. They list that load for a range of projectiles of that weight. I referred to the pistol data to show the differences in velocity due to the shorter barrel. A .223 pistol is just a bolt action rifle with a short barrel and a handgun stock so not loaded to a lighter pressure. Some refer to them as hand cannons. The Nosler data also shows IMR4895 as a little faster than H4895/ AR2206H. This is more in line with my results over the years and I am starting to regard the Hodgdon/ADI data as borderline hot and likely extremely hot with projectiles other than the very soft Sierra 169 grain HPBT. I strongly suggest that you do the load test I mentioned in my first post. If your cases will not hold a primer after a couple of firings then the load is too hot. This is my last post on the matter but am happy to answer questions PM or other.
Regards Grandpamac.

Originally Posted by Nathan F

Thanks for the concern but pistol data is completely irrelevant. Sure it’s warm but not dangerous.
Attachment 195178

CUP - you do understand the difference between CUP and PSI eh?

Speed isn't everything. At some point accuracy goes out the window

Originally Posted by Tentman

CUP - you do understand the difference between CUP and PSI eh?

Yep

Originally Posted by grandpamac

Greetings again Nathan F,
This moring I looked up the Nosler data for the .223 with 69 and 70 grain projectiles. Their listed max was 24 grains of H4895 for 2,810 fps in a 20 inch barrel and a Nosler case. They list that load for a range of projectiles of that weight. I referred to the pistol data to show the differences in velocity due to the shorter barrel. A .223 pistol is just a bolt action rifle with a short barrel and a handgun stock so not loaded to a lighter pressure. Some refer to them as hand cannons. The Nosler data also shows IMR4895 as a little faster than H4895/ AR2206H. This is more in line with my results over the years and I am starting to regard the Hodgdon/ADI data as borderline hot and likely extremely hot with projectiles other than the very soft Sierra 169 grain HPBT. I strongly suggest that you do the load test I mentioned in my first post. If your cases will not hold a primer after a couple of firings then the load is too hot. This is my last post on the matter but am happy to answer questions PM or other.
Regards Grandpamac.

Yep no problem. I did another test this morning and have dialled the load back to 26.0 gns. This is getting me a 5 shot average of 2899 fps and es of 29fps with sd of 9. That will work for me. It does t seem to matter with these projectiles it’s all sub moa if not half moa. The rifle loves them. I do appreciate the concern however. Peace to you all