280 Ackley Improved

[lancetkenyon]

58.0 RL23 pushes the 175 Berger Elite @ 2975fps in my 26" .280AI.

 

[B-P-UU]

Below is the data I have. Keep in mind, I was basically looking for pressure / velocity so haven't done any accuracy testing yet. This was all shot with a 25" barrel.

Nosler brass, 168 H-VLD, 210M primers, RL-26, 60 degrees:
61 gr = 3,130 fps (pressure)
61.5 gr = 3,160 fps (heavy extractor, pressure)

these were the first 2 shots trying RL-26. Data was hard to come by so I started with what some guys were using for the new 175 gr. ELD-X bullet. this charge proved to be too much for my rifle, however. (I shot the 61.5 gr. load because I didn't believe my magnetospeed).

Nosler brass, 168 H-VLD, CCI 250 Primers, RL-26, 75 degrees:

58.5 - 2863 fps
59.0 - 29.2 fps
59.5 - 2931 fps
60.0 - 2927 fps
60.5 - 2997 fps

No signs of pressure or extractor marks

Nosler Brass, 175 Hornady ELD-X, CCI 250, RL-26, 75 degrees:

57.5 - 2791
58.0 - 2856
58.5 - 2879
59.0 - 2911
59.5 - 2926 *faint extractor mark
60.0 - 2983 *extractor mark

I retested some of the above with 210M primers and found velocity was better with them, but I cant find those notes.

 

[wsq]

I was using basically the same loads with cci 250 primers gave me better accuracy and a little more velosity

 

[300 H&H]

I'm running 175 gr elite hunter over 59.8 gr of Norma MRP and 10 shot ave of 3015 with a ES of 13 FPS

 

[LongWalker]

Below is the data I have. Keep in mind, I was basically looking for pressure / velocity so haven't done any accuracy testing yet. This was all shot with a 25" barrel.

Nosler brass, 168 H-VLD, 210M primers, RL-26, 60 degrees:
61 gr = 3,130 fps (pressure)
61.5 gr = 3,160 fps (heavy extractor, pressure)

these were the first 2 shots trying RL-26. Data was hard to come by so I started with what some guys were using for the new 175 gr. ELD-X bullet. this charge proved to be too much for my rifle, however. (I shot the 61.5 gr. load because I didn't believe my magnetospeed).

Nosler brass, 168 H-VLD, CCI 250 Primers, RL-26, 75 degrees:

58.5 - 2863 fps
59.0 - 29.2 fps
59.5 - 2931 fps
60.0 - 2927 fps
60.5 - 2997 fps

No signs of pressure or extractor marks

Nosler Brass, 175 Hornady ELD-X, CCI 250, RL-26, 75 degrees:

57.5 - 2791
58.0 - 2856
58.5 - 2879
59.0 - 2911
59.5 - 2926 *faint extractor mark
60.0 - 2983 *extractor mark

I retested some of the above with 210M primers and found velocity was better with them, but I cant find those notes.

That's a huge help. Thank you sir!

 

[laker]

What powder charge? Just a starting point would be helpful.

59.5 got me to 2900

 

[Tidus56]

59.5 got me to 2900

RL-26 right?

 

[laker]

RL-26 right?

Yep RL26

 

[xsn10s]

Wow so on the 280 Sherman or even the 300 Sherman do you just run a reamer on a existing 280 rem or 30-06? Do you need to fire form prior to making actual ammo? Thanks ahead of time.

 

[Slick8]

Wow so on the 280 Sherman or even the 300 Sherman do you just run a reamer on a existing 280 rem or 30-06? Do you need to fire form prior to making actual ammo? Thanks ahead of time.

You can run a Sherman reamer behind a standard or an AI chamber to create the Sherman chamber.

Once done, you will now have to fire form your brass and use a specific reloading die.

It's a drastic difference once done. Here's some 22-250 before and after fire forming to an AI.

 

[280AckMattNZ]

Hi All, this my first post on Long range hunting.com. I'm based in New Zealand. Picked up some RE23 for my 280 Ack. Would anyone have some starting loads that I could work up from. Trying 150gr BT's 160 sierra's and 162 ELD-X. Thanks Matt

 

[DocDoc]

You have to create a false shoulder by expanding the neck beyond the final diameter, then necking the front end of the neck to final diameter with correct headspace and fire forming.

 

[MudRunner2005]

Here's a before and after for my .25-06 AI brass.

On the left is a case that has been prepped and is ready to be fired in my .25-06 AI rifle for fire-forming. On the right is a fully-formed .25-06 AI case.

 

[280AckMattNZ]

lancetkenyon said: ↑
I started at 55.0gr RL23. Worked up to 59.0gr before I hit pressure. But 58.0 was the accuracy, and safe. I have shot it from 4° to 110° with no major discernable speed changes. About 22fps between the 106° temp extremes.

Where would be a good start point with RE23 and a 160gr in 280AI? Around 55gr as well?
Thanks