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#6091398 - 12/18/15 05:27 PM Ackely Reloading help
stxhunter Offline
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Registered: 03/04/08
Posts: 738
Loc: Fort Worth
First off, I'll say that I'm still new to rifle reloading, done plenty of pistol though.

I have a 260 Ackely that I'm going to be loading for. Typically how much extra powder can be added to an ackley cartridge over the standard loading? Should I just rely on published max loads and look for pressure signs?



Edited by stxhunter (12/18/15 08:55 PM)
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#6091716 - 12/18/15 10:44 PM Re: Ackely Reloading help [Re: stxhunter]
dee Offline
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Registered: 04/10/10
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Loc: Red River way
In the 308 base cartridges typically .5-1.0gr can be added depending on powder choice.
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#6091804 - 12/19/15 03:43 AM Re: Ackely Reloading help [Re: stxhunter]
jorge Online   content
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Registered: 02/01/11
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Loc: Lake Jackson, TX
-x% to 10% is what ive experienced with ack imp rounds. Ive had/have 280ai, 6mm ai, 243 ai, 260 ai, 257 ai, 22-6ai, 6-06 ai, 30 Gibbs (very similar), 22-250ai, 25-06 ai, and 30-06 ai. Keep in mind you do the ack imp change to TRY and gain speed but it doesnt always workout. For example, my current 243 ai is upper 1/3 of spectrum for std 243 load. That proves to be most accurate. So im not even running max std 243 velocity. It drives tacks, half moa day in day out. Ive run it up and the next node just pancakes primers, like barely lift out bolt stuck, with comparable accuracy. I keep doing it because the round just looks flat out sexy and dont have to trim necks. Ymmv.


Edited by jorge (12/19/15 03:46 AM)
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#6092069 - 12/19/15 10:24 AM Re: Ackely Reloading help [Re: stxhunter]
stxhunter Offline
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Registered: 03/04/08
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Loc: Fort Worth
Thanks. From what I was reading most say 0.5-1gr extra is what they are seeing before excessive pressure.

When you say -x% to 10% you mean that you've actually added 10% to some AI round? If so that seems like a big jump to me!
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#6092566 - 12/19/15 06:26 PM Re: Ackely Reloading help [Re: stxhunter]
kmon1 Offline
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Registered: 09/27/06
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Loc: Texas
Rounds with a lot of case taper like 257 roberts or 22-250 will add the most volume by getting the AI treatment since body taper is almost removed. Look at the 250 savage and the creedmoor case for a close example of increased volume
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#6092708 - 12/19/15 08:24 PM Re: Ackely Reloading help [Re: stxhunter]
Michael W. Offline
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Registered: 11/22/10
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Sierra has a technical office that you can call. I did about 15 yrs. ago about my 338.06 AI and if I recall right he said that you use a formula of 1.03 for the increase. So for a 45 gr. load the increase would be 1.35 grs. On a smaller case the increase would be smaller. I believe he said this would work will all Ai rounds. Try calling Sierra to make sure.
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#6092770 - 12/19/15 08:57 PM Re: Ackely Reloading help [Re: stxhunter]
kmon1 Offline
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Registered: 09/27/06
Posts: 20289
Loc: Texas
A few examples These are water overflow comparisons not actual powder volume, but shows how some cases increase more than others. One rule of thumb for this is for 10% volume increase for a 4% velocity increase

7X57 59.5gr overflow capacity 62.4gr overflow Capacity of AI version a 4.6% increase
250 Savage 45.5gr overflow capacity 51gr overflow Capacity of AI version a 9.9% increase
280 Rem 67.9gr overflow capacity 74gr overflow Capacity of AI version an 8.7% increase
243 Win 54gr overflow capacity 57gr overflow Capacity of AI version a 5.6% increase
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#6092852 - 12/19/15 09:45 PM Re: Ackely Reloading help [Re: stxhunter]
jorge Online   content
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Registered: 02/01/11
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Originally Posted By: stxhunter
Thanks. From what I was reading most say 0.5-1gr extra is what they are seeing before excessive pressure.

When you say -x% to 10% you mean that you've actually added 10% to some AI round? If so that seems like a big jump to me!


Actually yes. Had a 30gibbs cut with serengetti style reamer 1.5° leade vs 3.0° and man that thing scared me working up my load but it was 9.xx%, sorry i rounded. Dont know how it ended up like it did. The smith auggested the reamer. Never had that set up again so couldnt tell ya if that was it. It was very compressed. Im probably very lucky looking back on things.
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#6092920 - 12/19/15 10:56 PM Re: Ackely Reloading help [Re: Michael W.]
stxhunter Offline
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Registered: 03/04/08
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Loc: Fort Worth
Thanks for the advice and comparisons!


Originally Posted By: Michael W.
Sierra has a technical office that you can call. I did about 15 yrs. ago about my 338.06 AI and if I recall right he said that you use a formula of 1.03 for the increase. So for a 45 gr. load the increase would be 1.35 grs. On a smaller case the increase would be smaller. I believe he said this would work will all Ai rounds. Try calling Sierra to make sure.


I'll give Sierra a call and see what they suggest.
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#6096388 - 12/22/15 10:07 AM Re: Ackely Reloading help [Re: stxhunter]
stxhunter Offline
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Registered: 03/04/08
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Loc: Fort Worth
I ended up running 46-48.7gr yesterday, 46-47.2gr wasn't very promising, but I've included the 47.5-48.7 test below. When I came home I looked through some additional references and saw that the Hornady manual stated 49.9gr of H4831 as a max for the 260 with 129gr SST bullets. This seems rather high, can anyone else confirm this?

I finished this OCW at 48.7gr with absolutely no pressure signs. I think for the next test I'll redo what I did plus go up to close to what Hornday is recommending and just watch for pressure signs.

If I follow the OCW methodology it looks like 47.8gr is the load to choose right now even though it wasn't the smallest group (I may have pulled the one on the bullseye just a tad). Like I mentioned before these are my first rifle reloads, so I'm pretty pleased with the results so far.

Any advice would be appreciated.

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#6096429 - 12/22/15 10:26 AM Re: Ackely Reloading help [Re: stxhunter]
ChadTRG42 Online   happy
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Registered: 09/16/09
Posts: 9413
Loc: Lewisville, TX
OCW will get you in the ball park, so use it as an area to be in, and not exactly. Looking at your target, it's showing a typical load work up pattern. 47.5 is an open pattern, not in the sweet spot. 47.8 is stringing up and down, which tells me you are approaching a node or past one. 48.1 is noticeably tighter, and looks good. 48.4 strings again, telling me you past a node. 48.7, 2 shots not enough to tell. So, 48.1 looks good. Now that you have an idea on where you are at with charges, shoot them at 200 yards for a more detailed info on the groups. Do you know the speeds? Typically you will yield about 75 fps more with the AI chambering than a standard 260 Rem. I know many 260 AI shooters, and everyone said 75-80 fps was the gain. 100-150 fps gain is just not there.
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#6097135 - 12/22/15 05:13 PM Re: Ackely Reloading help [Re: stxhunter]
stxhunter Offline
Tracker

Registered: 03/04/08
Posts: 738
Loc: Fort Worth
Thanks for the help Chad!!

Would you bother to redo any of the ones from that target? I was originally going to redo the entire workup just to make sure it was the same. But now that I'm thinking about it I may just do 48, 48.1, 48.2, 48.7 and add on to that 49, 49.3,49.5, 49.7. The hornady manual states 49.9 grs is max, but when I loaded up 49.7 it's TIGHT!

I'd like to stretch out the gun a bit, but not really sure where to go in the DFW area. Pretty much everything I've found is a 100yrd range or less. I did find a range in Waxahachie that goes out to 1200, but it's $30/day. Any recommendations?

Unfortunately I don't have a chrono so I don't haven a way to determine speeds. I've seen varying reports on the speeds of the 260AI, it would be interesting to see what mine is running.
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#6097499 - 12/22/15 08:41 PM Re: Ackely Reloading help [Re: stxhunter]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
I'd focus on the 48.1 gr area. I've seen several rifles hit the sweet spot, but were crap before, and crap after. Barrel length and barrel contour often has something to do with it.

Go to the range in Waxahachie and try it at 200 yards or more. $30 a day is cheap. I've also had rifles that shot every load I fed it to 300 yards very tight, some will some won't
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