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.280 Ackley and 150grn Swift Scirocco II

 
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  #1  
Old 02-07-2013, 06:53 PM
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.280 Ackley and 150grn Swift Scirocco II

Can anyone help me with some load data for the combo above? I would really like to use the 150 Swift Scirocco II and be able to push it to 3000fps with accuracy but im having a hard time finding load data for this caliber/bullet combo.

Anyone have quickload that would care to provide some info for me? or personal experience would be great also.

The rifle is a Cooper Excalibur with a 26" tube. Nosler Brass.
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  #2  
Old 02-10-2013, 01:27 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

Ok, Ill ask this question differently,

Im having trouble finding a bullet that i can get close to the rifling but still fit in the magazine.

Any of the high BC bullets are way to long. The only bullet that i have tried that i can get within 30 thou of the lands is he 140AB. The 160 AB i can get to about 50 thou off the lands.

Everything else ive tried are a mile from the lands.

Suggestions?
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  #3  
Old 02-10-2013, 03:00 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

I have a Cooper M52 in 280AI that I am working up a load for. Here is where I stand:

I have the same mag length constraint you have. I actually filled the inside of the mag catch notch in the magazine with epoxy as rounds were sticking in it nose-first. It actually worked pretty slick. I still can't get to the lands with long bullets. . .

I have worked up loads using 160ABs and 160 TSXs. Both in front of 57gr H4831SC. No pressure signs, and there will be room to increase. The ABs were at max mag length leaving them 47 thou off the lands. The TSXs could be seated to the lands, but my experience is that they like to be at least 30 thou off so that is where I started.

I only loaded 10 of each as this was an initial work-up. I fired 3 shot groups only and got very good results. My worst group was 0.64" with the TSXs, but both projectiles averaged just under 0.5" across 3 groups each.

So, my initial concerns about loading right up to the lands proved to be unnecessary . . . I was even more pleased as my fireform loads SUCKED for accuracy.
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.280 Ackley and 150grn Swift Scirocco II-berlin-20130112-00401.jpg   .280 Ackley and 150grn Swift Scirocco II-berlin-20130112-00402.jpg  

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  #4  
Old 02-10-2013, 03:07 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

Also, a question for you. Are you using Nosler 280 rem brass or 280AI brass? I read an article that the SAAMI spec for Nosler 280 AI was 14 thou shorter than the original PO Ackley design, creating a potentially unsafe case-stretch issue. Cooper told me that their reamer is the PO Ackley design, but they seemed a little non-committal. If you have actual measurements I would be very interested in your experience.

Thanks
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  #5  
Old 02-10-2013, 03:38 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

Iv got some 2000 rounds through my excalibur 280ai. Nosler brass has been fine with over 10 cycles and no issues at all. I shoot 162 amax single shot for longer ranges (though its still .040 off as thats as long as I can extract a loaded round) and the ttsx 140gr for a mag length load for close stuff. It s one of the least fussy rifles Iv ever had so as above try them at mag lenght and see how they go. You shouldnt have any trouble getting that speed wit a 26" barrel.
Re: the differnt chamber specs , I read an article a while ago that compared the go-nogo gauges for both the PO Ackley and the SAAMI and no actual difference could be found other than they seemed to be indexed off slightly different positions on the shoulder.

https://gunsmithtalk.wordpress.com/2...eadspace-test/
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  #6  
Old 02-10-2013, 04:05 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

Yawn,

Thanks for the post and the excellent link. If I can get away from fireforming my next batch of brass that would be fantastic.
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  #7  
Old 02-10-2013, 04:45 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

Thanks for replys guys. Im using Nosler Brass, BR2 primers.

VH8R, Standard tsx and not ttsx correct?

I had really good groups out of 160 AB using 55.5 IMR 4350, i didnt measure them but i would be inside of 1/2". but was only getting 2800fps on my chrony.

The 1st load i ever made up was 59.5 IMR 4831 and 140 AB, This load also shot very well but i couldnt get it to group again to save my life yesterday.

MY chrony is an older shooting chrony so maybe its accuracy is in question.

I've taken the dremel to front of my magazine and thinned it down. Hadnt thought about filling that mag latch cavity with epoxy, but i am now!

Thanks for the help guys. Looking forward to more replys.
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