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.280 Ackley and 150grn Swift Scirocco II

 
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  #8  
Old 02-10-2013, 05:12 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

You are correct, good old fashioned non-tipped TSXs.

I know it borders on heresy, but 2800fps out of 280AI isn't that bad with 160's. I would bet with the longer barrel and 160gr pills you could probably get some utility out of a slower powder. I would be interested to see your chrony results using H4831 or even IMR7828 (Hodgdon.com lists a load for it).

Let us know how it progresses! It is COLD here so I am shooting vicariously through LRHers.
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  #9  
Old 02-10-2013, 05:34 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

Quote:
Originally Posted by varmintH8R View Post
You are correct, good old fashioned non-tipped TSXs.

I know it borders on heresy, but 2800fps out of 280AI isn't that bad with 160's. I would bet with the longer barrel and 160gr pills you could probably get some utility out of a slower powder. I would be interested to see your chrony results using H4831 or even IMR7828 (Hodgdon.com lists a load for it).

Let us know how it progresses! It is COLD here so I am shooting vicariously through LRHers.

Thanks VH8R,


Me also,

Not to cold here, 25F right now, Middle of a blizzard though. snow and gusts to 40mph. I cant even see my 100yd target right now, to much blowing snow.
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  #10  
Old 02-11-2013, 04:44 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

VH8R,

Here is the group that i spoke of using 55.5 imr4350 and 160 AB.

Good group, just wasnt getting the speed i was hoping for.

It is un-realistic to think that i can get 3000fps out of a 160 AB in the 280AI?

Running numbers it looks like the 140AB launched at 3200fps (which i can do but havent found perfect load there yet) will have about 10" less drop, within 1" of same wind drift, and 100lbs less energy than the 160AB launched at 3000fps(which i cant do) at 600yds. I might just run the 140AB if i can make it shoot like the 160's @ 2800.

I was only thinking of the 160AB because of my annual elk trip. otherwise its whitetail sized game.
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.280 Ackley and 150grn Swift Scirocco II-0209130900.jpg  
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  #11  
Old 02-12-2013, 07:52 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

I think 3000fps is probably unrealistic with 160s. Most of the 7mm mag data I see for 160s is 2950 to 3000. Of course, "internet people" routinely experience velocities quite a bit over published data. Their 280 Ackleys are faster than 7mag, too. I love my 280AI but it flat out aint faster than a 7mag.

That being said, with a slower powder you might get a bit more speed out of that longer barrel. Worth trying - my personal preference is for heavier bullets.

I am no ballistics genius, and I'm betting this relationship is not typically linear. But, I thought it was interesting:

140 is 12.5% lighter than 160

2800 is 12.5% slower than 3200

Critters will be bummed either way, seeing the groups above!
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  #12  
Old 02-12-2013, 10:58 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

I dont think 3000 is at all unrealistic with a 26 inch barrel. Iv been running the 162 amax at 2920 form a 23" (validated many times at long range) and the nosler brass has tight primer pockets after many cycles. Slower powders will help with the heavier bullets, RL 22, N165, N560, H1000. If you are keen on the accubonds I think Id look at the new long range 150gr nosler have just put out. Better BC than the 160 and youll be able to push it faster. I might give them a try on the next new barrel.
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  #13  
Old 02-12-2013, 11:28 PM
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Re: .280 Ackley and 150grn Swift Scirocco II

I shoot 160 AB's almost exclusively in my 280AI and always clock them around 3030 fps. My load now is with RL17

Here is my data and if you use YOU SHOULD START LOW AND WORK UP JUST LIKE I DID

AUDETTE AB 160 0.507 RL17 3.350 1 53.7 0.030 2911
AUDETTE AB 160 0.507 RL17 3.350 2 54.0 0.030 2949
AUDETTE AB 160 0.507 RL17 3.350 3 54.3 0.030 2962
AUDETTE AB 160 0.507 RL17 3.350 4 54.6 0.030 3003
AUDETTE AB 160 0.507 RL17 3.350 5 54.9 0.030 2949
AUDETTE AB 160 0.507 RL17 3.350 6 55.2 0.030 2996
AUDETTE AB 160 0.507 RL17 3.350 7 55.5 0.030 3003
AUDETTE AB 160 0.507 RL17 3.350 8 55.8 0.030 3030
AUDETTE AB 160 0.507 RL17 3.350 9 56.1 0.030 3072
AUDETTE AB 160 0.507 RL17 3.350 10 56.4 0.030 3065

I now load at 56 gr and primer pockets are staying good

Before RL17 I used RL22 and RL25 and was able to hit 3000 fps without problem

My gun is a 26" Hart barrel and that OAL is .030" off the lands. I have a tight chamber and a .313" neck.

I tried the 150 gr SSII's and my Audette was as follows

AUDETTE SCIRR 150 0.551 RL17 3.350 1 53.5 0.030 2996
AUDETTE SCIRR 150 0.551 RL17 3.350 2 53.8 0.030 3030
AUDETTE SCIRR 150 0.551 RL17 3.350 3 54.1 0.030 3044
AUDETTE SCIRR 150 0.551 RL17 3.350 4 54.3 0.030 3044
AUDETTE SCIRR 150 0.551 RL17 3.350 5 54.6 0.030 3051
AUDETTE SCIRR 150 0.551 RL17 3.350 6 54.9 0.030 3058
AUDETTE SCIRR 150 0.551 RL17 3.350 7 55.2 0.030 3075
AUDETTE SCIRR 150 0.551 RL17 3.350 8 55.5 0.030 3110
AUDETTE SCIRR 150 0.551 RL17 3.350 9 55.8 0.030 3108
AUDETTE SCIRR 150 0.551 RL17 3.350 10 56.1 0.030 3108
AUDETTE SCIRR 150 0.551 RL17 3.350 11 56.4 0.030 3125
AUDETTE SCIRR 150 0.551 RL17 3.350 12 56.7 0.030 3174
AUDETTE SCIRR 150 0.551 RL17 3.350 13 57.0 0.030 3174


But accuracy was not as good as with the 160 AB. Perhaps a seating depth test might yield better results. I know my 6.5 rem mag likes the 130 SSII's at .060" off
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  #14  
Old 02-13-2013, 11:44 AM
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Re: .280 Ackley and 150grn Swift Scirocco II

Thanks guys, I just happen to have a pound or so of RL17. I will give it a try.
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