RL 33 and the 7STW

[shooter74]

Has anyone tried this powder in a 7Stw with 168/180 gr vld’s?

 

[sbhooper]

I do not have this caliber, but I will bet that it does fine. I really like it in my 26-inch, 7 mag, with 175 and 160-grain bullets. I can get the 175 up over 3000 and the 160 hits 3000 without pushing the load too heavily.

 

[fourpower]

Has anyone tried this powder in a 7Stw with 168/180 gr vld’s?

Has anyone tried this powder in a 7Stw with 168/180 gr vld’s?

we tried rl-33 in 7rum with 195gr bergers. a match made in heaven. 1/4 moa @ 900yds. 2 bull elk one @495 another @ 800. getting over 3100fps. great powder in this combo!

 

[centerlineseal]

You guys have a "starting low" load for the 168s?

 

[bholcomb]

I have always had great results with 7828 and the 150 gr accubonds

 

[Willie]

IMR 7828 works great in mine, 3,035 fps w/180 Berger, 26" barrel. RL-33 was too spikey for my taste, at upper node. I am fixing to try VV n-570 in mine, heard some very good results about it and scored 16# a month ago.

 

[Zero333]

I Love RL-33 in for one of my 300winmags with 240smk.
I can give you QuickLoad starting loads for 7STW with 168's and 180's.
But I'll use my Adjusted Ba (burn rate factor) with the RL-33 because the lots of RL-33 I've used are faster burning than the default RL-33 Ba in quickload. So by using my adjusted Ba factor I'm more confident you will have no early pressure signs.
Usually the QL Ba factors for 99% of the powders are damn close. But with RL-33 I found my actual results (based on Velocity) need a decent Ba adjustment.
In Case anyone cares... the QL default Burn Rate Factor Ba for RL-33 is 0.2670... I use 0.2800

Here is the QL prediction
Highlighted in Bold letters is the MAX/near MAX
========================================

Cartridge : 7 mm STW
Bullet : .284, 168, Berger Hunt Hybrid #28570
Useable Case Capaci: 89.063 grain H2O = 5.783 cm³
Cartridge O.A.L. 3.650 inch = 92.71 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-33 (adjusted Ba)

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 76 68.88 2378 2109 30672 12904 89.7 1.728
-18.0 78 70.60 2444 2229 32981 13362 91.3 1.685
-16.0 80 72.32 2511 2352 35478 13802 92.8 1.642
-14.0 82 74.05 2578 2479 38155 14220 94.2 1.593
-12.0 84 75.77 2645 2611 41001 14615 95.4 1.539
-10.0 86 77.49 2713 2745 44047 14983 96.5 1.487
-08.0 88 79.21 2780 2884 47314 15321 97.5 1.437
-06.0 90 80.93 2848 3025 50821 15627 98.3 1.389
-04.0 92 82.66 2915 3169 54586 15899 98.9 1.342
-02.0 94 84.38 2982 3316 58631 16133 99.4 1.298 ! Near Maximum !
+00.0 95 86.10 3048 3465 62980 16328 99.8 1.255 ! Near Maximum !
+02.0 97 87.82 3114 3617 67659 16482 100.0 1.214 !DANGEROUS LOAD-DO NOT USE!

= 86.1 gr = 95% case fill = 3,048 fps - 3,465 ft-lbs muzzle energy - 62,980 psi of chamber pressure - 99.8 % powder burn
=========================================

Cartridge : 7 mm STW
Bullet : .284, 180, Berger Hunt VLD #28502
Useable Case Capaci: 86.188 grain H2O = 5.596 cm³
Cartridge O.A.L. L6: 3.650 inch = 92.71 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-33 (adjusted Ba)

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 76 66.40 2320 2151 30940 12736 91.0 1.770
-18.0 78 68.06 2384 2271 33257 13171 92.5 1.726
-16.0 80 69.72 2448 2395 35755 13587 93.8 1.682
-14.0 82 71.38 2512 2523 38414 13981 95.1 1.630
-12.0 84 73.04 2577 2654 41243 14351 96.2 1.576
-10.0 86 74.70 2641 2789 44273 14693 97.2 1.523
-08.0 87 76.36 2706 2926 47521 15007 98.0 1.472
-06.0 89 78.02 2770 3067 51004 15288 98.7 1.423
-04.0 91 79.68 2834 3211 54741 15536 99.3 1.376
-02.0 93 81.34 2898 3356 58751 15747 99.7 1.331 ! Near Maximum !
+00.0 95 83.00 2961 3505 63059 15921 99.9 1.288 ! Near Maximum !
+02.0 97 84.66 3024 3655 67690 16055 100.0 1.246 !DANGEROUS LOAD-DO NOT USE!

83 gr = 95% case fill - 2,961 fps - 3,505 ft-lbs muzzle energy - 63,059 chamber pressure - 99.9% powder burn.
------------------------------------------------------

Reduce these Max loads by 7 grains and work up accordingly.

 

[shooter74]

Thank you

 

[sbhooper]

You guys have a "starting low" load for the 168s?

If you are referring the the 7 stw, I would start around 75 grains. That is my load for the standard 7 mag and 175, so that should be a good starting point for stw with 168s.

 

[rickiesrevenge]

Works great in my 7mm Dakota with 180's and 195's. 83gr with 180's

Aaron

 

[AckleymanII]

I have had 3 of the 7 STW's, my reamer with zero to .020 Freebore for use in Winchester brass. Our thinking for short 500 yard shots on deer only was to go for mid weight bullets, very fast...120-150g Noslers.

So, I had Pac nor put a 27" SS three groove barrel on using my reamer. It took less than 25 rounds to start shooting groups in the 2's with a 8-32 Burris Black diamond scope on the rifle. The Pac Nor 11 Twist, three groove behaved very differently than the Remington SS Sendero 7 Mag re chambers in how it built pressure. In the Pac Nor, we still shoot the 140g Nosler Combined Tech bullet at 3650 and the 120g Noslers at 3850 using IMR 7828 and 215 Primers, Win brass only. This 11 Twist barrel is a sendero weight barrel with the factory Sendero stock, and we use a muzzle break. Accuracy at 600 is 1.5-2.5" which has just killed all deer in one shot....NO runners...none!

We put a food plot out at 500 yards and named this the STW stand, deer never smell us