280ai with 7828ssc

[muzz]

Ok so I loaded up 4 different loads with 150ablr's. 60 thru 61 grains of 7828ssc. Blew one primer with the 61 grain load. Stick hard to lift bolt. All loads show shinny spot on brass and ejector marks, but rl26 didn't show any of these problems .

 

[Ridgerunner665]

Velocity?
OAL?

 

[muzz]

No clue on velocity, didn't take the chrono. And the depth of these are seated shorter then the 150ablr's were. My measurement with the hornady ogive is 2800 the 150 bullets were 2830

 

[muzz]

My case capacity with h20 is 73g with my nosler brass

 

[NWBlacktail]

Wow! I've been saving all these QL data requests for the 280AI, and that should been right in there. Somewhere in the low 50k psi.

It almost seems like velocity is your best measure. Between QL data, and book data, charge weight seems to be all over the place. But velocities seem to show where you are in terms of pressure. Just an observation though, not sure. :?

 

[Ridgerunner665]

I'd like to get my hands on that rifle...then I could figure this out.

Something isn't right...

That load should be safe in a 280 Remington...

 

[muzz]

That's the load data I used just to be safe. It makes no sence to me at all.

 

[JD338]

I'm running the 150 gr ABLR in my 280AI
with 61.0 grs RL22 for 3100 fps in a 24" barrel.

JD338

 

[Ridgerunner665]

Muzz,
I noticed you have a digital scale...

Do you have check weights? And if so, what's your procedure for calibrating your scale?

 

[muzz]

Turn it on, hit calibrate. It zeros. I put my weight on and it says the same weight that's on the weight.

 

[nvbroncrider]

Have you cross referenced it with a beam by chance? Just throwing it out there.

 

[muzz]

Yes

 

[nvbroncrider]

That's weird cause I'm running 60.5 and 61.5 with 168's. If I recall right Jim is running 59.5 with 168's

 

[muleman]

I'm running 63.5gr of 7828ssc with 150ABLRs in my 280AI but my OAL is 3.395. I show pressure signs at 64.5gr.
Muzz, What primer are you running? How far off the lands are you?

Scott

 

[muzz]

Fed 210m, and 20 thou from lands

 

[Ridgerunner665]

Turn it on, hit calibrate. It zeros. I put my weight on and it says the same weight that's on the weight.

Try it with a different check weight just to see what happens.... Use a bullet that isn't anywhere close to the same as your check weight.

 

[muzz]

I did. It's right on the money

 

[Ridgerunner665]

Did you have any oil or cleaners in the barrel?

I've blown primers from just having oil in the chamber/throat...

 

[longrangehunter]

Turn it on, hit calibrate. It zeros. I put my weight on and it says the same weight that's on the weight.

You should let the scale warm up for a least an hour...... if you allow it to sit there you'll see the weight will change until it is full warmed up. I turn mine on early in the morning that day and let it sit until I see my powder pan weight 118.8.

So I just turned mine on and weighted the pan, 118.4. This will come up, I will then calibrate it, and check again, even during long strings of weighting powder I'll check the scale. But percentage wise that's not huge, something tells me you have something else going on and not the scale.

My 20 gram weight reads 19.96 when first turned on depending on how long it was between calibrations..... basically it changes is what I'm saying.

If you want accurate charges from the scale use the above method will help and I've done it this way for 15 years now.