280 AI Velocity problems!?

[newmexkid]

Now that the weather has cooled off I have started searching for a load for my new 280AI. While contemplating the build, I was hoping for at least 3100 FPS with a 140 gr. Nosler Accubond. My barrel is a Brux finished at 26". So far I have tried H-4831SC-IMR4350-IMR4831. All with Norma fire formed cases with CCI primers. This morning I got a velocity of 3018 FPS with a max load, (for the rifle) of IMR4831. The Nosler book shows IMR 4831 as their accuracy powder at 58.5 grs. I got extractor marks at 57.5 so I won't go any higher.A guy at the range said I should try RL 26 for more speed. Is that correct?

 

[Dmagna]

I get 3200 with 140 accubonds. Using H4831sc I believe at 62.5 grains

 

[newmexkid]

I get 3200 with 140 accubonds. Using H4831sc I believe at 62.5 grains

I get 3200 with 140 accubonds. Using H4831sc I believe at 62.5 grains

Wow! What is the length of your barrel? I got ejector marks at 62.0 and didn't want to go any higher. I was nowhere near 3200 FPS.

 

[newmexkid]

I think maybe I need to get a hold of the gunsmith. This is the 3rd rifle he's built for me and all except for this one have been great.

 

[Dmagna]

Wow! What is the length of your barrel? I got ejector marks at 62.0 and didn't want to go any higher. I was nowhere near 3200 FPS.

It's a 26 inch barrel. I also shoot 160s at 3060fps, with reloder 26

 

[Tlyle]

Try RL 17 or RL 23
280 AI is tough to get good speed

 

[Dmagna]

Is it a saami chamber?

 

[Dmagna]

Try RL 17 or RL 23
280 AI is tough to get good speed

No it's not, I have 2 of them and they are killers

 

[venatic]

Reloder 26 or N560 will get you where you want to go.

 

[adk hunter]

Re-26 and 23 are the speed champs. 4831sc great accuracy too just slower. No problems with speed especially with such a long barrel...

 

[newmexkid]

Is it a saami chamber?

yes.

 

[newmexkid]

Accuracy has been all that I expected, it's just the velocity that I'm not happy with. OK. I have RL 22-23-26. Anyone care to share a starting load with either powder with the 140 gr. bullet?

 

[Heavyiron]

X2 on rl 26. I'm getting 2980 with the 7mm 165 game changer and 60 grains of rl 26. I have just started with the game changer bullet but it shows a lot of potential on medium game.

 

[newmexkid]

Went back an read all the responses. Seems like RL 26 might be a happy place. Luckily I have 13 lbs. of it. I should have asked for help before I blew through 235 Accubonds! As they say...The only stupid question is the one not asked!