.280 Ackley and 150grn Swift Scirocco II

[TimeOnTarget]

In reviving my old thread, I finally got some decent time on the target the last 2 mornings. Temps finally cooperated and this morning when i began it was 54f.



I have still been trying to get the Swift Scirocco II to shoot. I just couldnt get away from that bullet, Mostly cause i liked the tough construction of it and it had a nice BC to go with it.

I picked up a pound of IMR 7828ssc awhile back and that was going to be the powder that i wanted to work with this weekend.

I set up my dies and measured a starting point of .010 off the lands. I loaded 5 rounds and went and shot them for a group over the chrony. Low velocity was 3029 high was 3056. The group, well i bout couldnt hold it together as each shot stacked right in there.

Now the funny part,

After a group like that i had to shoot another! When back down to the reloading room and started to load up another 5 rounds. Then i looked at my calipers laying on the bench. They were closed and weren't reading anywhere close to 0.00.

I closed them up, zeroed them and then measured the round that i had just made. 3.29. These bullets touch the rifling at 3.39. Thats right, This unbelievable load is shooting at .100 off the lands! Went and shot the 2nd group and really beared down. EVEN BETTER! (see attached) This is a 5 Shot group. Not 3!


I wanted to confirm velocities with the shooter app on my phone. I backed up the max distance my range is right now of 450yds. Put a balloon about the size of my fist on the target. punched some numbers for this new load into shooter, I put in 4.5 MOA of elevation, and held for 3 MOA of wind. Balloon disappeared. (attached)

I would have stopped long before i ever got that far off the lands, Some mistakes are worth making i guess...

I went in and had a cup of coffee. Figured this was a good place to stop for the day.

 

[FEENIX]

Excellent grouping ... persistence paid off ... WTG!

Good luck.

Ed

 

[varmintH8R]

Awesome! Nice shooting! I have some 7828 that is now going to get a look in the 280AI.

I have loaded a work-up with 168 Berger VLD hunters as well - not sure when I will get a chance to set them off but will post results when I do.

Good luck this fall. It is now on public record so if you miss you have no excuses!

 

[beretzs]

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.

I am working with the 150 Swift right now as well, only in a 7mm Rem Mag. I started them .050" off the rifling, on a hunch that is where they will like to be anyhow. Either way, let me know how you make out with them. Here is some QL information for you.

Cartridge : .280 Ack Imp
Bullet : .284, 150, Swift Scirocco
Useable Case Capaci: 64.807 grain H2O = 4.208 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 26.0 inch = 660.4 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 63000 psi, or 434 MPa
or a maximum loading ratio or filling of 110 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

9 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Norma MRP 103.2 64.3 4.17 3189 100.0 63000 11616 1.181 ! Near Maximum !
Vihtavuori N560 105.0 64.1 4.15 3182 98.5 63000 11929 1.178 ! Near Maximum !
Ramshot Magnum 107.2 68.6 4.44 3178 99.1 63000 11699 1.169 ! Near Maximum !
PB Clermont PCL 517 107.6 68.6 4.45 3177 99.1 63000 11689 1.169 ! Near Maximum !
SNPE Vectan SP 12 107.5 68.5 4.44 3177 99.2 63000 11667 1.170 ! Near Maximum !
Accurate MAGPRO 105.2 66.8 4.33 3170 97.3 63000 11987 1.185 ! Near Maximum !
IMR 7828 SSC 103.5 63.5 4.12 3165 98.8 63000 11524 1.169 ! Near Maximum !
IMR 7828 109.4 63.5 4.12 3165 98.8 63000 11524 1.169 ! Near Maximum !
Raufoss RA15 105.2 63.5 4.12 3156 99.5 63000 11461 1.184 ! Near Maximum !
Alliant Reloder-22 105.2 63.5 4.12 3156 99.5 63000 11461 1.184 ! Near Maximum !
Bofors RP5/NP ~approximation 105.2 63.5 4.12 3156 99.5 63000 11461 1.184 ! Near Maximum !
Winchester WXR 108.0 63.8 4.14 3155 99.5 63000 11476 1.185 ! Near Maximum !
Alliant Reloder-25 110.0 65.4 4.24 3150 100.0 60295 11103 1.195 ! Near Maximum !
ADI AR 2213 104.5 63.1 4.09 3149 98.7 63000 11428 1.169 ! Near Maximum !
ADI AP 2214 108.3 67.1 4.35 3138 98.9 63000 11249 1.167 ! Near Maximum !
Rottweil R905 106.4 63.1 4.09 3118 98.3 63000 11171 1.186 ! Near Maximum !
ADI AR 2209 101.3 60.2 3.90 3111 99.4 63000 10859 1.176 ! Near Maximum !
Bofors RP5 NT ~approximation 108.1 65.8 4.27 3110 96.9 63000 11269 1.174 ! Near Maximum !
Alliant Reloder-19 101.9 60.9 3.94 3109 99.4 63000 10922 1.184 ! Near Maximum !
Ramshot Hunter 97.4 60.1 3.89 3102 100.0 63000 10530 1.190 ! Near Maximum !
Bofors RP14 ~approximation 102.6 61.3 3.97 3101 99.4 63000 10842 1.184 ! Near Maximum !
Hodgdon H414 92.0 58.1 3.77 3100 99.9 63000 10578 1.192 ! Near Maximum !
Winchester 760 92.0 58.1 3.77 3100 99.9 63000 10578 1.192 ! Near Maximum !
Somchem S365 99.0 58.8 3.81 3085 100.0 63000 9760 1.200 ! Near Maximum !
Bofors RP4 ~approximation 99.8 59.6 3.86 3083 99.3 63000 10640 1.185 ! Near Maximum !
Norma 204 96.6 59.6 3.86 3083 99.3 63000 10640 1.185 ! Near Maximum !
Raufoss RA4 99.8 59.6 3.86 3083 99.3 63000 10640 1.185 ! Near Maximum !
Hodgdon H4831 SC 103.0 62.2 4.03 3081 98.1 63000 10772 1.182 ! Near Maximum !
Hodgdon H4831 107.2 62.2 4.03 3081 98.1 63000 10772 1.182 ! Near Maximum !
Vihtavuori N570 110.0 69.3 4.49 3079 93.1 53691 12554 1.258
Alliant Reloder 33 110.0 72.2 4.68 3079 94.2 54442 12443 1.252
Vihtavuori N550 94.2 57.5 3.72 3078 100.0 63000 10205 1.201 ! Near Maximum !
Norma URP 96.9 57.3 3.71 3078 100.0 63000 10071 1.197 ! Near Maximum !
Bofors RP19 ~approximation 97.0 57.3 3.71 3077 100.0 63000 10069 1.197 ! Near Maximum !
Norma MRP 2 110.0 65.7 4.26 3074 98.2 55263 11692 1.253 ! Near Maximum !
Accurate 4350 100.4 57.4 3.72 3072 100.0 63000 10023 1.214 ! Near Maximum !
Somchem S385 102.0 61.6 3.99 3069 99.8 63000 10410 1.204 ! Near Maximum !
IMR 4831 101.7 58.2 3.77 3058 100.0 63000 9844 1.207 ! Near Maximum !
Bofors RP4 NT ~approximation 97.4 59.1 3.83 3058 99.9 63000 10228 1.198 ! Near Maximum !
Winchester Supreme 780 100.4 63.2 4.10 3057 99.3 63000 10362 1.190 ! Near Maximum !
Rottweil R904 100.6 59.3 3.84 3052 98.6 63000 10383 1.188 ! Near Maximum !
Vihtavuori N165 107.4 63.4 4.11 3051 99.6 63000 10162 1.195 ! Near Maximum !
Lovex S070 96.6 57.1 3.70 3041 99.9 63000 10050 1.206 ! Near Maximum !
Vihtavuori N160 107.4 61.5 3.98 3033 98.5 63000 10185 1.191 ! Near Maximum !
Hodgdon Hybrid 100V 99.5 57.5 3.73 3031 100.0 63000 9273 1.199 ! Near Maximum !
Rottweil R907 94.5 55.4 3.59 3022 99.8 63000 9916 1.200 ! Near Maximum !
IMR 4007 SSC 91.5 55.4 3.59 3021 99.8 63000 9909 1.200 ! Near Maximum !
Lovex S071 110.0 62.1 4.03 3020 100.0 60528 10041 1.240 ! Near Maximum !
Accurate 3100 110.0 62.1 4.03 3020 100.0 60528 10041 1.240 ! Near Maximum !
Somchem S361 99.5 63.3 4.10 3018 98.0 63000 10177 1.199 ! Near Maximum !
Lovex S065 95.6 55.8 3.62 3016 100.0 63000 9656 1.206 ! Near Maximum !
Rottweil R903 91.8 54.3 3.52 3012 100.0 63000 9279 1.218 ! Near Maximum !
Hodgdon H1000 110.0 65.0 4.21 3012 97.6 55211 10952 1.239
Somchem S355 92.1 53.8 3.49 3010 100.0 63000 9306 1.211 ! Near Maximum !
Accurate 4064 93.3 52.1 3.38 2967 100.0 63000 8771 1.240 ! Near Maximum !
Hodgdon Retumbo 110.0 66.1 4.28 2960 99.1 48000 11432 1.321


Let me know if there is a certain powder you are looking at. I would think RL22/IMR7828 would be a good place to start..


On edit, I just read the rest of your post! That's excellent shooting. That gives me alot of hope since I am starting .050" off. I know I can back them them down and still be in the money. I just loaded up some powder charge profiles last night, so the first ones will be to find my powder charge and from there, I will tweak seating depth. Very happy with the Swift's, they seem very consistent and their performance on animals is excellent as well.

 

[TimeOnTarget]

There performance on game was the driving force behind me wanting to use them.

Way better weight retention than the accubond in my limited experience with them. Hope they work out for you!