I bought a pound of Winchester WXR today. I knew it was in the range or the 4831's/RL22, so I knew it will work in my 260 Remington with 140 gr. bullets. I can't find any data for the 260/WXR combo, but there is alot of data for RL22 (which I heard is near identical to WXR - and Norma MRP too). Could I assume the max load will be within a grain or so of the RL22 loads for the WXR powder? I found WXR data for the 7mm Rem Mag, and max loads seem to be very close to RL22 loads.

I do have a chrony to aid in load development. Any help would be much appreciated.

Cartridge : .260 Rem
Bullet : .264, 140, HDY SP 2630
Cartridge O.A.L. L6 : 2.800 inch or 71.12 mm
Barrel Length : 24.0 inch or 609.6 mm
Powder : Winchester WXR

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 Btime
% % Grains fps ft.lbs psi psi % ms

-20.0 83 36.80 2189 1490 27520 8165 86.1 1.681
-18.0 85 37.72 2247 1570 29387 8460 87.5 1.637
-16.0 87 38.64 2305 1652 31388 8748 89.0 1.593
-14.0 89 39.56 2364 1737 33534 9028 90.3 1.550
-12.0 91 40.48 2423 1825 35834 9299 91.6 1.508
-10.0 94 41.40 2482 1915 38311 9561 92.8 1.465
-08.0 96 42.32 2541 2007 40970 9811 93.9 1.419
-06.0 98 43.24 2601 2103 43831 10047 94.9 1.375
-04.0 100 44.16 2660 2200 46914 10271 95.9 1.332
-02.0 102 45.08 2720 2300 50236 10479 96.7 1.291
+00.0 104 46.00 2780 2402 53827 10670 97.5 1.251 ! HOT LOAD !
+02.0 106 46.92 2840 2507 57708 10845 98.2 1.212 ! HOT LOAD !
+04.0 108 47.84 2899 2613 61912 11000 98.7 1.175 !DANGEROUS LOAD-DO NOT USE!
+06.0 110 48.76 2959 2722 66470 11136 99.2 1.139 !DANGEROUS LOAD-DO NOT USE!
+08.0 112 49.68 3019 2833 71418 11251 99.5 1.104 !DANGEROUS LOAD-DO NOT USE!
+10.0 114 50.60 3078 2946 76812 11344 99.8 1.071 !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 104 46.00 2929 2666 66108 10505 100.0 1.151 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 46.00 2581 2071 43192 10198 90.2 1.379

Here is quickLOAD estimation for the 140gr Hornady seated to SAAMI. Looks to me that the max load (to the industry reccomended redline of 52,666psi) is in the region of 45.5gr

As the blurb says, 'quickLOAD data must not be used in place of published data etc etc'

I'd probably work up from 41gr. If you seat longer but not on the lands you should be able to go higher as at that COL a lot of case volume is occupied by the bullets.

Y'know, I wish W-W would quit bringing out a "great powder for heavy bullet/magnum loads", then, after it's around for a few years, they drop it. They did it with 780BR, then 785, then WMR. Wonder how long WXR will be on the market, before they decide to drop it?

tod - I'd load it the same as the others you've worked with - start out around 40 grains, and work up till you get around 2,700 - 2,750, and stop there. Are you loading the XLC's?
BTW - the snow's melting on my range, it's down to only about 7 feet deep now

R-WEST

1894 ,

Thanks alot, that is so cool. By way of comparing what loads I got for WXR in other cals (270, 7mm, 300), and comparing it to RL22, it seems they are close. Maybe WXR uses .8 grs. less powder on average. I guesstimated a max load for 140 gr. bullets at 45 grs. WXR, +/- a hair.

I will try it with some 140 gr. Sierra GameKings to get an idea of ballpark performance, then will reduce and switch to the 140 gr. Barnes XLC. Is it possible to calculate the data for WXR and a 140 gr. Barnes X or even an XLC?? Or can quickload tell what the blue coating is going to do? Also, my rifle has a 22" barrel.

Thanks again.

[ 03-12-2003, 11:47: Message edited by: todbartell ]

Tod,

No such thing as a free lunch. The extra length into the case seems to make a fair difference.

Please be careful not to mix the columns! Also I have to say that for this conservative loader quickLOAD seems to overestimate chargeweights - that may be due to tight custom chambers in my rifles however.

Cartridge : .260 Rem
Bullet : .264, 140, BAR 'XLC' S 26453
Cartridge O.A.L. L6 : 2.800 inch or 71.12 mm
Barrel Length : 22.0 inch or 558.8 mm
Powder : Winchester WXR

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 Btime
% % Grains fps ft.lbs psi psi % ms

-20.0 80 34.39 2065 1326 27012 8162 83.4 1.600
-18.0 81 35.25 2116 1392 28593 8462 84.8 1.562
-16.0 83 36.11 2168 1461 30275 8760 86.1 1.525
-14.0 85 36.97 2220 1532 32069 9055 87.4 1.488
-12.0 87 37.83 2272 1605 33984 9345 88.7 1.452
-10.0 89 38.69 2325 1681 36029 9629 89.9 1.417
-08.0 91 39.55 2379 1759 38213 9907 91.1 1.382
-06.0 93 40.41 2432 1839 40551 10177 92.2 1.348
-04.0 95 41.27 2486 1922 43052 10437 93.2 1.315
-02.0 97 42.13 2541 2007 45732 10688 94.2 1.282
+00.0 99 42.99 2595 2094 48605 10927 95.1 1.250
+02.0 101 43.85 2650 2183 51692 11154 96.0 1.218 ! HOT LOAD !
+04.0 103 44.71 2705 2275 55005 11367 96.7 1.187 ! HOT LOAD !
+06.0 105 45.57 2761 2369 58574 11565 97.4 1.156 ! HOT LOAD !
+08.0 107 46.43 2816 2465 62419 11747 98.0 1.123 !DANGEROUS LOAD-DO NOT USE!
+10.0 109 47.29 2872 2563 66568 11913 98.6 1.091 !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 42.99 2747 2345 59018 11050 99.4 1.162 ! HOT LOAD !
Data for burning rate decreased by 10% relative to nominal value:
-Ba 99 42.99 2405 1798 39695 10205 86.6 1.352

1894 ,

Again, thank you. You've been a big help. Is the column on the far left, %, tell you what how much the powder will fill up the capacity until it is compressed with that particular bullet? I notice the Hornady is 0.0% @ 46 grs., the XLC is 0.0% @ 43 grs.

Thanks again.

The 0.0% you are referring to is the % change from the charge weight input by me. I adjust this figure on the input window until I get near the reccomended pressure limit and then click on the '% step' button which gives a spread upwards and down from that. The next % is the percentage fill, then charge weight, then MV, then energy, then chamber pressure (assuming not on lands) then muzzle pressure then % powder burnt by muzzle, then barrel/burn time (not sure which)

quickLOAD is a tremendous asset. I particularly like the %burnt feature which allows one to find the powder with the best muzzle velocity for dawn/dusk shooting.

That is a cool system. Really helpful for the odd powders.

How much does the quickload change for WXR, between the previous mentioned 140 gr. Hornady and the Sierra 140 gr. boat tail? 22" barrel. The reason I ask is I ran out of the 140 Hornady, and have a full box of 140 Sierra BTSP to try before the X bullets.