270 WSM 140 gr accubond COL

[2elkhunt]

I just bought a 270 wsm in the Winchester super shadow and I am working up some loads with the AccuBond 140 gr bullets, and I was wandering what kind of COL should be. I know the maxium is 2.860 and I seated my bullets to that diamention (2.860) and as far as I can tell the bolt cycles easy and there are no signs of the bullet touching the riflings.

I was just wandering what kind of COL you other shooters are shooting.

Thank You

 

[Richracer1]

I too have a 270 WSM Super Shadow. I load mine with 140AB, 61.5gn of RL-19, GM215M primers and a COL of 2.875". I hope this helps.

 

[R Flowers]

In my Winchester Model 70 chambered in 270 WSM I seat the 140 Accubonds to an OAL of 2.83 inches. So we are all pretty much on the same track here.

 

[Mighty Peace]

I have two Tikka T3 LS 270WSM's (wife's & mine). Both shoot 140gr Accubonds. I just got back from the range on monday nite tweaking the load for one of the rifles.

Both shoot using Retumbo. One load @ 71.0gr COMPRESSED, the other rifle's load that was just fine-tuned is 68.7gr. Both shoot well under 1/2" groups @ 100metres. The new load has a 3 shot grouping of 0.217"

Cant remeber the COAL, but I will check tonite to repost it. I know that what the rifle will giv me, wont fit in my clip. My reloads are just fitting inside the clip.

 

[2elkhunt]

It sounds like i'm in the right ball park, now to find the right load.

Thanks for you replys

 

[Mighty Peace]

As promised, for my reloads, COL of 2.8550
My clip max length is 2.904 but my COAL for my Tikka T3 rifles is 3.054 but it wont fit the clip. Plus with my reloads shooting 0.217" at 100 metres, I'm not going to complain. :wink:

 

[FOTIS]

It sounds like i'm in the right ball park, now to find the right load.

Thanks for you replys

I will be more than happy to run a Quickload simulation for you if you give me barrel length and a coal.
Either way my best loads on various 270 wsm's and 140 AB have been 63-66 gr of rl22. Reduce 10% work up. here is one:


Cartridge : .270 Win Short Mag [WSM]
Bullet : .277, 140, NOS AccuBond 54765
Cartridge O.A.L. L6: 2.860 inch or 72.64 mm
Barrel Length : 24.0 inch or 609.6 mm
Powder : Alliant Reloder-22

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-20.0 82 52.00 2531 1992 31911 10504 90.9 1.549
-18.0 84 53.30 2597 2096 34161 10844 92.2 1.508
-16.0 86 54.60 2663 2204 36575 11172 93.4 1.467
-14.0 88 55.90 2729 2314 39166 11485 94.6 1.422
-12.0 90 57.20 2794 2428 41951 11782 95.6 1.377
-10.0 92 58.50 2860 2543 44941 12061 96.6 1.333
-08.0 94 59.80 2926 2662 48154 12320 97.4 1.291
-06.0 96 61.10 2992 2783 51570 12560 98.1 1.251
-04.0 99 62.40 3057 2906 55222 12776 98.7 1.212 ! Near Maximum !
-02.0 101 63.70 3123 3031 59138 12969 99.2 1.174 ! Near Maximum !
+00.0 103 65.00 3188 3159 63339 13137 99.6 1.138 ! Near Maximum !
+02.0 105 66.30 3252 3288 67852 13279 99.8 1.104 !DANGEROUS LOAD-DO NOT USE!
+04.0 107 67.60 3316 3419 72704 13393 100.0 1.070 !DANGEROUS LOAD-DO NOT USE!
+06.0 109 68.90 3380 3551 77928 13480 100.0 1.038 !DANGEROUS LOAD-DO NOT USE!
+08.0 111 70.20 3443 3686 83558 13559 100.0 1.006 !DANGEROUS LOAD-DO NOT USE!
+10.0 113 71.50 3506 3821 89637 13632 100.0 0.976 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 103 65.00 3329 3444 76621 12669 100.0 1.051 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 103 65.00 2986 2771 50510 12964 94.8 1.254