280 AI

[Mark37082]

I have 30 162 ELDM's loaded up in new Peterson brass with RL23. If I can get myself to the range, I will post the results. Too many distractions this time of year. The fish are biting and the weeds are growing.

 

[AZ82New]

I think he means slower as in lower velocity not burn rate. H4831 has been about 100 fps slower than R 26. I have some R23 but have been reluctant to try it as I have not seen any on shelves in a while.

I found it to get me about 50 fps more than 4831sc.

 

[john k]

59.6 RL 23, 175 EH, 26 inch. Getting 2950. 300 yard zero works good for me.

View attachment 565997

That load will hunt!

 

[Rocketeer77]

He would have gain velocity with the silencer on the barrel. A silencer generally increases velocity.

We run suppressors on all our rifles and checking velocities there's a negligible difference certainly nothing of note speed wise.

 

[Pauleye]

Anybody using the hornady 175 interlock. If so what powders. Thanks

 

[Mike Matteson]

Take one step back to go to H4350 it's also very temp stable. It's faster than H4831. The other is I would use H4831SC than H4831. It flows better.

That for sure, H4350 is faster, and more stable too. I've been stopped in completing my reload shack in Montana for now. I believe that by late May I'll get back and finish it. To many fuction on my plate this last year. I think I will done with. it's making me travel across the country. If I am luck I will 2 other rifles built by then too.
I been stocking up on components while waiting or work on the shack. It's has in way taken almost the same time to get items for the rifle builts too.

 

[Rflshootr]

Anybody using the hornady 175 interlock. If so what powders. Thanks

Here is Sierra data for their 175. Accuracy load with
IMR 4350.

280 Ackley Improved​
Primer:​	WLR​	Test Firearm: ​	Savage Model 116​
Case: ​	Federal​	BBL Length: ​	26"​
Twist: ​	1x9"​	Trim-to Length: ​	2.515"​
Bullets: ​
#1940 7 mm/.284 Caliber (.284) 175 gr. SBT OAL 3.325

Powder/Velocity	2400	2500	2600	2700	2750	2800
IMR-4350		47.7	49.0	50.3	50.9
IMR-4831		48.3	50.3	52.3	53.3
XMR-3100		50.2	51.8	53.4
MagPro	49.6	52.2	54.8	57.4	58.7	60.0
Viht N165	47.1	49.9	52.7	55.5
RE-22	46.0	48.4	50.8	53.2	54.4
H1000	49.9	52.5	55.1	57.7
Magnum	52.7	55.0	57.3	59.6
RE-25	49.3	51.6	53.9	56.2	57.3	58.5
Energy/ft.lbs.	2238	2429	2627	2833	2938	3047

Accuracy Load: IMR-4350/ 50.3grs. 2700fps/ 2833ft. lbs.

Hunting Load: IMR-4350/ 50.9grs. 2750fps/ 2938ft. lbs.

 

[Kivaari]

So...what was the correction with R26...
Benchrest guys would say a consistent "well sent" flyer is a little hot; or it could be the edge of a node. They would either reduce charge a smidge or increase the case capacity by seating farther out in .002 increments.