6.5X300WSM

[DrMike]

Joel,

With 130 grain AB, here's some data for you.

Cartridge : 6.5 mm Rock (WSM)
Bullet : .264, 130, Nosler AccuBond 56902
Useable Case Capaci: 72.054 grain H2O = 4.678 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-25

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 81 53.20 2582 1925 32093 12004 97.4 1.598
-18.0 83 54.53 2647 2023 34325 12309 98.2 1.557
-16.0 85 55.86 2712 2123 36716 12585 98.9 1.516
-14.0 87 57.19 2776 2224 39276 12830 99.5 1.468
-12.0 89 58.52 2839 2327 42018 13043 99.8 1.422
-10.0 91 59.85 2902 2432 44957 13222 100.0 1.378
-08.0 93 61.18 2965 2537 48113 13369 100.0 1.335
-06.0 95 62.51 3026 2643 51500 13509 100.0 1.293
-04.0 97 63.84 3087 2750 55138 13645 100.0 1.254
-02.0 99 65.17 3147 2858 59024 13777 100.0 1.216 ! Near Maximum !
+00.0 101 66.50 3206 2967 63157 13906 100.0 1.179 ! Near Maximum !
+02.0 103 67.83 3265 3077 67573 14030 100.0 1.144 !DANGEROUS LOAD-DO NOT USE!
+04.0 105 69.16 3323 3188 72293 14150 100.0 1.110 !DANGEROUS LOAD-DO NOT USE!
+06.0 107 70.49 3381 3300 77344 14265 100.0 1.078 !DANGEROUS LOAD-DO NOT USE!
+08.0 109 71.82 3439 3414 82753 14376 100.0 1.046 !DANGEROUS LOAD-DO NOT USE!
+10.0 111 73.15 3496 3529 88553 14482 100.0 1.016 !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 101 66.50 3321 3183 76912 13455 100.0 1.089 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 101 66.50 3030 2650 50033 14476 99.6 1.301

Cartridge : 6.5 mm Rock (WSM)
Bullet : .264, 130, Nosler AccuBond 56902
Useable Case Capaci: 72.054 grain H2O = 4.678 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon Retumbo

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 86 57.60 2565 1900 31085 12483 94.9 1.614
-18.0 88 59.04 2636 2007 33349 12867 96.3 1.570
-16.0 91 60.48 2708 2117 35789 13217 97.4 1.527
-14.0 93 61.92 2779 2230 38420 13531 98.4 1.480
-12.0 95 63.36 2851 2345 41260 13804 99.1 1.429
-10.0 97 64.80 2921 2464 44324 14034 99.6 1.381
-08.0 99 66.24 2992 2584 47643 14218 99.9 1.335
-06.0 101 67.68 3061 2705 51233 14355 100.0 1.290
-04.0 104 69.12 3130 2828 55123 14471 100.0 1.247
-02.0 106 70.56 3198 2952 59345 14583 100.0 1.205 ! Near Maximum !
+00.0 108 72.00 3265 3078 63934 14690 100.0 1.165 ! Near Maximum !
+02.0 110 73.44 3332 3205 68925 14791 100.0 1.126 !DANGEROUS LOAD-DO NOT USE!
+04.0 112 74.88 3398 3334 74367 14886 100.0 1.089 !DANGEROUS LOAD-DO NOT USE!
+06.0 114 76.32 3464 3464 80298 14975 100.0 1.053 !DANGEROUS LOAD-DO NOT USE!
+08.0 116 77.76 3530 3597 86801 15057 100.0 1.018 !DANGEROUS LOAD-DO NOT USE!
+10.0 119 79.20 3595 3731 93862 15133 100.0 0.985 !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 108 72.00 3402 3341 79915 14132 100.0 1.067 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 108 72.00 3054 2692 50381 15248 98.8 1.293

With 140 grain ABs, here is what QL generates:

Cartridge : 6.5 mm Rock (WSM)
Bullet : .264, 140, Nosler AccuBond 39457
Useable Case Capaci: 71.388 grain H2O = 4.635 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon Retumbo

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 85 56.00 2488 1924 31049 12427 96.1 1.666
-18.0 87 57.40 2555 2030 33277 12783 97.3 1.621
-16.0 89 58.80 2623 2138 35675 13105 98.2 1.577
-14.0 91 60.20 2690 2249 38254 13391 99.0 1.531
-12.0 93 61.60 2757 2363 41033 13637 99.5 1.479
-10.0 95 63.00 2823 2478 44029 13841 99.9 1.429
-08.0 97 64.40 2889 2595 47262 14001 100.0 1.382
-06.0 99 65.80 2954 2713 50753 14132 100.0 1.337
-04.0 102 67.20 3018 2832 54529 14259 100.0 1.293
-02.0 104 68.60 3082 2953 58614 14381 100.0 1.251 ! Near Maximum !
+00.0 106 70.00 3145 3075 63041 14498 100.0 1.210 ! Near Maximum !
+02.0 108 71.40 3208 3198 67847 14609 100.0 1.171 !DANGEROUS LOAD-DO NOT USE!
+04.0 110 72.80 3270 3323 73068 14716 100.0 1.133 !DANGEROUS LOAD-DO NOT USE!
+06.0 112 74.20 3331 3450 78741 14816 100.0 1.097 !DANGEROUS LOAD-DO NOT USE!
+08.0 114 75.60 3393 3579 84868 14911 100.0 1.062 !DANGEROUS LOAD-DO NOT USE!
+10.0 116 77.00 3454 3709 91510 14999 100.0 1.028 !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 106 70.00 3271 3326 78590 13966 100.0 1.110 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 106 70.00 2950 2705 49618 15114 99.2 1.342

Cartridge : 6.5 mm Rock (WSM)
Bullet : .264, 140, Nosler AccuBond 39457
Useable Case Capaci: 71.388 grain H2O = 4.635 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-25

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 79 52.00 2514 1964 32607 11947 98.3 1.641
-18.0 81 53.30 2575 2062 34859 12223 99.0 1.598
-16.0 83 54.60 2636 2161 37268 12471 99.5 1.555
-14.0 85 55.90 2697 2261 39845 12687 99.8 1.507
-12.0 87 57.20 2757 2363 42604 12871 100.0 1.458
-10.0 89 58.50 2816 2466 45558 13026 100.0 1.414
-08.0 91 59.80 2875 2569 48725 13176 100.0 1.370
-06.0 93 61.10 2933 2673 52115 13323 100.0 1.329
-04.0 95 62.40 2990 2778 55712 13466 100.0 1.289 ! Near Maximum !
-02.0 97 63.70 3046 2884 59534 13605 100.0 1.251 ! Near Maximum !
+00.0 99 65.00 3102 2991 63606 13741 100.0 1.214 ! Near Maximum !
+02.0 101 66.30 3158 3100 67948 13872 100.0 1.178 !DANGEROUS LOAD-DO NOT USE!
+04.0 103 67.60 3213 3209 72579 14000 100.0 1.144 !DANGEROUS LOAD-DO NOT USE!
+06.0 105 68.90 3268 3319 77524 14123 100.0 1.111 !DANGEROUS LOAD-DO NOT USE!
+08.0 107 70.20 3322 3431 82808 14242 100.0 1.080 !DANGEROUS LOAD-DO NOT USE!
+10.0 109 71.50 3376 3544 88459 14356 100.0 1.049 !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 99 65.00 3207 3197 77129 13313 100.0 1.123 !DANGEROUS LOAD-DO NOT USE!

 

[BK]

Mike -
a 26" Brux (cut rifling) stainless barrel

What's the wait time on the Brux?

 

[Desert Fox]

I was wondering if my 6.5-284 can match this velocity or at least close to it using Reloader 25 or Retumbo. I'm already pushing the 140 grain Berger at 2978 using 50.5 grain of IMR 4831. Hmmm! I do have both powder. I'll probably give it a try.

 

[257 Ackley]

BK -
It is about 6 weeks from order placement to delivery. I stopped by the Brux shop when I was passing through Wisconsin on a business trip and talked to the guys for a while. Got a nice tour of the shop and watched them work on a couple barrels. I was hoping that would help make sure they paid close attention to my barrel and got it to the gunsmith as quick as possible.

 

[257 Ackley]

DF -
That is really an impressive SD for that string of shots. What did the target look like?

 

[tpbscha]

I built a 25X300WSM and love it. The only issue I have run into is the neck thickness of both Rem and Win 270WSM brass. After the sizing operation I was getting .017-.018 necks. I normally turn them back to .014 to help straighten things out.

I take it you are turning the outside of the case? What neck turner are you using? Part of the reason I bought 270WSM brass instead of using the 300WSM brass already in-stock was to reduce the chance of case walls getting thicker during the resizing process. Did you have a tight chamber reamed that doesn't allow for much wiggle room? What are you using for case length before you trim? The gunsmith is doing a cast of my chamber, so I should have all the dimensions when I get it back.

I'm using a Forster turner, but Sinclair has some nice tools. Mine is a std neck so I'm probably intoducing some slop by outside neck turning but it seems to improve runout and neck tension. After I do the initial sizing operation from .277 to .257 I use the neck expander mandrel before I turn the necks. I also like to anneal at this point. After that I run the brass through a neck bushing die and size about 3/4 of the neck. I think the remaining unsized portion of neck takes up the slop intoduced by the reduced neck thickness. After firing, I bump the shoulder .001" - .0015" and "partial" neck size with the bushing die. It's a little work, but the results are cool!

 

[Desert Fox]

DF -
That is really an impressive SD for that string of shots. What did the target look like?

You can see it here in this posting.

viewtopic.php?f=4&t=13836

 

[bullet]

Desert Fox, you do have your reloading techniques down and I like that. Good stuff

 

[jmad_81]

The first 270 WSM I bought was going to get built into a 6.5 WSM. I found it really hard to come up with those kinds of funds while in college though, and sold the 270 WSM.

That thing should be a deer slayer for a long ways, and have a pretty dang big cool factor!