.260 and RL-17

[Mtrigg88]

Hey guys. New to this forum. I'm wanting to try RL-17 in my custom .260 with 142 gr ABLR bullets. Do you guys have any experience with this powder and cartridge?

 

[SJB358]

I haven't used it in the 260 but it has worked decently in my Swede. I'm betting it would work the same in the 260 Rem.

 

[TackDriver284]

Cartridge : .260 Rem
Bullet : .264, 142, Nosler AccuBond LR 58922
Useable Case Capaci: 44.649 grain H2O = 2.899 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-17

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   85    36.90   2520    2003   41011   8854     99.7    1.423
-09.0   86    37.31   2547    2045   42338   8918     99.8    1.402
-08.0   87    37.72   2573    2087   43710   8977     99.9    1.382
-07.0   88    38.13   2599    2129   45128   9031    100.0    1.362
-06.0   89    38.54   2624    2171   46595   9080    100.0    1.342
-05.0   90    38.95   2650    2214   48111   9125    100.0    1.323
-04.0   91    39.36   2676    2257   49676   9170    100.0    1.304
-03.0   92    39.77   2701    2300   51298   9213    100.0    1.286  ! Near Maximum !
-02.0   93    40.18   2726    2343   52977   9256    100.0    1.267  ! Near Maximum !
-01.0   94    40.59   2751    2386   54712   9298    100.0    1.249  ! Near Maximum !
+00.0   95    41.00   2776    2430   56508   9340    100.0    1.232  ! Near Maximum !
+01.0   96    41.41   2801    2474   58363   9381    100.0    1.215  ! Near Maximum !
+02.0   97    41.82   2826    2518   60294   9421    100.0    1.198  !DANGEROUS LOAD-DO NOT USE!
+03.0   98    42.23   2851    2562   62287   9461    100.0    1.181  !DANGEROUS LOAD-DO NOT USE!
+04.0   99    42.64   2875    2606   64356   9500    100.0    1.165  !DANGEROUS LOAD-DO NOT USE!
+05.0  100    43.05   2900    2651   66496   9538    100.0    1.149  !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     95    41.00   2874    2604   68955   8972    100.0    1.144  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     95    41.00   2626    2173   45663   9695     98.7    1.348

 

[jimbires]

RL17 is the only powder I've used in my 260 .


a few target pics on page 2 .


viewtopic.php?f=9&t=32610

 

[Mtrigg88]

Thanks for the replies guys. Nice rifle Jim! I'm using the same stock. Model 7 action, 24" #3 bartlein 8 twist barrel, timney trigger. I started loading at 39 grains of rl-17 working up .3 grains to 42.5 gr. I based that on what I've read in other forums and alliant's website. But based off the data provided above, I may be pulling bullets.

 

[MAinAR]

Thanks for the replies guys. Nice rifle Jim! I'm using the same stock. Model 7 action, 24" #3 bartlein 8 twist barrel, timney trigger. I started loading at 39 grains of rl-17 working up .3 grains to 42.5 gr. I based that on what I've read in other forums and alliant's website. But based off the data provided above, I may be pulling bullets.

May not, rely on chrono, OBT is gonna be right on at just under 2,800. If your barrel is 100 fps slow or fast charge will change right at a grain one way or the other to be spot on.....

 

[TackDriver284]

Use a chrono and find your velocity, your # 5 node is around under 2,800

 

[bobnob]

M88, I don't shoot 6.5, but I used R17 extensively with 115-117g bullets in my 250 Sav AI which has a similar case-bore ratio and it was the fastest and most accurate powder.

Suspect it would be the bee's knees in your 260 Rem with heavies.

Great propellant!

 

[longrangehunter]

Ray's load at TBAC uses a 139 Scenar in Lapua brass along w/a F210M primer and 42.0 RL17 in his 260 Rem. I don't remeber the speed he was getting , but it was very accuate in his gun out to 700+ yards.

 

[Mtrigg88]

You guys were spot on. Went to the range yesterday with my chrono. The rl-17 really started shining at about 41 grains. Got to 42 grains and shot 1/2 Moa at 200 at 2785 fps. Next load was 42.3 and had a little bit of sticky bolt lift with 1 out of 3 cases. So 42 grains is going to be my go to load. Should be safe this season considering it was 82 degrees with 70% humidity yesterday. Thanks guys!

 

[TackDriver284]

You guys were spot on. Went to the range yesterday with my chrono. The rl-17 really started shining at about 41 grains. Got to 42 grains and shot 1/2 Moa at 200 at 2785 fps. Next load was 42.3 and had a little bit of sticky bolt lift with 1 out of 3 cases. So 42 grains is going to be my go to load. Should be safe this season considering it was 82 degrees with 70% humidity yesterday. Thanks guys!

Good to hear that it shot good. We were glad to help.

 

[jimbires]

You guys were spot on. Went to the range yesterday with my chrono. The rl-17 really started shining at about 41 grains. Got to 42 grains and shot 1/2 Moa at 200 at 2785 fps. Next load was 42.3 and had a little bit of sticky bolt lift with 1 out of 3 cases. So 42 grains is going to be my go to load. Should be safe this season considering it was 82 degrees with 70% humidity yesterday. Thanks guys!

man you gotta love it when good things happen this easy .

 

[Leslil]

Could someone please run the QL numbers for the same input as tackdrivers post but with a 22" barrel and a COAL of 2.91? I just picked up one of the campfire special MRC 1/8 260's. it has plenty of mag box.

 

[Dwh7271]

Cartridge          : .260 Rem
Bullet             : .264, 142, Nosler AccuBond LR 58922
Useable Case Capaci: 46.178 grain H2O = 2.998 cm³
Cartridge O.A.L. L6: 2.910 inch = 73.91 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant Reloder-17

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   75    33.60   2219    1553   30167   9034     96.3    1.553
-18.0   77    34.44   2273    1629   32141   9277     97.2    1.512
-16.0   79    35.28   2326    1706   34240   9504     98.0    1.472
-14.0   81    36.12   2380    1786   36483   9714     98.6    1.433
-12.0   83    36.96   2433    1866   38870   9906     99.1    1.392
-10.0   85    37.80   2486    1948   41416  10078     99.5    1.350
-08.0   87    38.64   2538    2031   44135  10231     99.8    1.310
-06.0   88    39.48   2590    2115   47036  10363    100.0    1.272
-04.0   90    40.32   2641    2200   50136  10474    100.0    1.236
-02.0   92    41.16   2692    2285   53448  10578    100.0    1.200  ! Near Maximum !
+00.0   94    42.00   2743    2372   56993  10678    100.0    1.166  ! Near Maximum !
+02.0   96    42.84   2793    2459   60791  10776    100.0    1.134  !DANGEROUS LOAD-DO NOT USE!
+04.0   98    43.68   2842    2547   64859  10871    100.0    1.102  !DANGEROUS LOAD-DO NOT USE!
+06.0  100    44.52   2891    2636   69227  10963    100.0    1.072  !DANGEROUS LOAD-DO NOT USE!
+08.0  102    45.36   2940    2725   73912  11051    100.0    1.042  !DANGEROUS LOAD-DO NOT USE!
+10.0  103    46.20   2989    2816   78957  11136    100.0    1.014  !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     94    42.00   2842    2547   69461  10272    100.0    1.082  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     94    42.00   2590    2115   46011  11021     98.4    1.278

 

[Leslil]

Thank you very much.