Forums46
Topics537,017
Posts9,719,434
Members86,987
|
Most Online25,604 Feb 12th, 2024
|
|
|
Ackely Reloading help
#6091398
12/18/15 11:27 PM
|
Joined: Mar 2008
Posts: 838
stxhunter
OP
Tracker
|
OP
Tracker
Joined: Mar 2008
Posts: 838 |
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?
Last edited by stxhunter; 12/19/15 02:55 AM.
|
|
|
Re: Ackely Reloading help
[Re: stxhunter]
#6091716
12/19/15 04:44 AM
|
Joined: Apr 2010
Posts: 6,219
dee
THF Trophy Hunter
|
THF Trophy Hunter
Joined: Apr 2010
Posts: 6,219 |
In the 308 base cartridges typically .5-1.0gr can be added depending on powder choice.
"A vote is like a rifle; it's usefulness depends on the character of the user" Theodore Roosevelt
|
|
|
Re: Ackely Reloading help
[Re: stxhunter]
#6091804
12/19/15 09:43 AM
|
Joined: Feb 2011
Posts: 6,183
Mike Honcho
THF Trophy Hunter
|
THF Trophy Hunter
Joined: Feb 2011
Posts: 6,183 |
-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.
Last edited by jorge; 12/19/15 09:46 AM.
“Two things that define an individual what you do when you have everything, and what you do when you have nothing."
|
|
|
Re: Ackely Reloading help
[Re: stxhunter]
#6092069
12/19/15 04:24 PM
|
Joined: Mar 2008
Posts: 838
stxhunter
OP
Tracker
|
OP
Tracker
Joined: Mar 2008
Posts: 838 |
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!
|
|
|
Re: Ackely Reloading help
[Re: stxhunter]
#6092566
12/20/15 12:26 AM
|
Joined: Sep 2006
Posts: 32,442
kmon11
junior
|
junior
Joined: Sep 2006
Posts: 32,442 |
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
lf the saying "Liar, Liar your pants on fire" were true Mainstream news might be fun to watch
|
|
|
Re: Ackely Reloading help
[Re: stxhunter]
#6092708
12/20/15 02:24 AM
|
Joined: Nov 2010
Posts: 5,985
Michael W.
THF Trophy Hunter
|
THF Trophy Hunter
Joined: Nov 2010
Posts: 5,985 |
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.
A clear conscience is often the sign of a fuzzy memory.
|
|
|
Re: Ackely Reloading help
[Re: stxhunter]
#6092770
12/20/15 02:57 AM
|
Joined: Sep 2006
Posts: 32,442
kmon11
junior
|
junior
Joined: Sep 2006
Posts: 32,442 |
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
lf the saying "Liar, Liar your pants on fire" were true Mainstream news might be fun to watch
|
|
|
Re: Ackely Reloading help
[Re: stxhunter]
#6092852
12/20/15 03:45 AM
|
Joined: Feb 2011
Posts: 6,183
Mike Honcho
THF Trophy Hunter
|
THF Trophy Hunter
Joined: Feb 2011
Posts: 6,183 |
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.
“Two things that define an individual what you do when you have everything, and what you do when you have nothing."
|
|
|
Re: Ackely Reloading help
[Re: Michael W.]
#6092920
12/20/15 04:56 AM
|
Joined: Mar 2008
Posts: 838
stxhunter
OP
Tracker
|
OP
Tracker
Joined: Mar 2008
Posts: 838 |
Thanks for the advice and comparisons! 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.
|
|
|
Re: Ackely Reloading help
[Re: stxhunter]
#6096388
12/22/15 04:07 PM
|
Joined: Mar 2008
Posts: 838
stxhunter
OP
Tracker
|
OP
Tracker
Joined: Mar 2008
Posts: 838 |
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.
|
|
|
Re: Ackely Reloading help
[Re: stxhunter]
#6096429
12/22/15 04:26 PM
|
Joined: Sep 2009
Posts: 18,907
ChadTRG42
THF Celebrity
|
THF Celebrity
Joined: Sep 2009
Posts: 18,907 |
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.
|
|
|
Re: Ackely Reloading help
[Re: stxhunter]
#6097135
12/22/15 11:13 PM
|
Joined: Mar 2008
Posts: 838
stxhunter
OP
Tracker
|
OP
Tracker
Joined: Mar 2008
Posts: 838 |
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.
|
|
|
Re: Ackely Reloading help
[Re: stxhunter]
#6097499
12/23/15 02:41 AM
|
Joined: Dec 2008
Posts: 41,083
J.G.
THF Celebrity
|
THF Celebrity
Joined: Dec 2008
Posts: 41,083 |
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
800 Yard Steel Range Precision Rifle Instruction Memberships and Classes Available
|
|
|
Moderated by bigbob_ftw, CCBIRDDOGMAN, Chickenman, Derek, DeRico, Duck_Hunter, hetman, jeh7mmmag, JustWingem, kmon11, kry226, kwrhuntinglab, Payne, pertnear, rifleman, sig226fan (Rguns.com), Superduty, TreeBass, txcornhusker
|