300WSM ELD-X 200gr

[vitor.gameiro]

Hello guys,
Just new in the forum... but I need some help with my 300WSM... I use it for long range hunting and practice (and have fun) a lot with target shooting...
I'm running a 26" barrel and my ELD-X 200gr speeds up to 2960fps with vihtavuori N560... no signs of pressure, either during load development or shooting it... but... I have this feeling that I'm strecthing it a little to much... to hot...

IT SHOOTS GREAT!

Please... any one with 300WSM/ELD-X/N560 ? DrMike can you run a simulation for me, please ?
what is your experience?

Thank you.

 

[TackDriver284]

I had used the same bullet in my 300 Win Mag with RL 26, and I got the same results, no pressure at all up to 3,120 fps, but QuickLoad shows its at the red line, so I backed off to 3,080 fps and used it on two cow nilgai last year.

Do you have the H20 case fill data on your fired cases, it would be helpful to determine your pressure level on Quickload.

 

[SJB358]

I’m next to my computer for QL right now but I would bet you’re not being too hard on it. The 200 ELD is a pretty slick bullet and your 26” barrel helps the cause. I used Nosler 200’s to get 2890-2930 with stuff like RL19, H4831SC, etc so your speeds with 560 seem to jive.

 

[DrMike]

Cartridge          : .300 WSM (CIP)
Bullet             : .308, 200, Hornady ELD-X 3076 G7
Useable Case Capaci: 67.919 grain H2O = 4.410 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : Vihtavuori N560 *C

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   96    61.20   2661    3144   44358   9790     95.1    1.462
-09.0   97    61.88   2692    3218   45919   9903     95.6    1.438
-08.0   98    62.56   2723    3293   47539  10011     96.0    1.416
-07.0   99    63.24   2754    3368   49224  10116     96.5    1.393
-06.0  100    63.92   2785    3445   50971  10216     96.9    1.372
-05.0  101    64.60   2816    3522   52788  10312     97.3    1.350
-04.0  102    65.28   2847    3600   54676  10404     97.6    1.329  ! Near Maximum !
-03.0  103    65.96   2878    3679   56639  10492     98.0    1.308  ! Near Maximum !
-02.0  104    66.64   2909    3758   58682  10574     98.3    1.288  ! Near Maximum !
-01.0  105    67.32   2940    3838   60805  10652     98.6    1.267  ! Near Maximum !
+00.0  106    68.00   2971    3920   63016  10725     98.8    1.248  ! Near Maximum !
+01.0  107    68.68   3002    4001   65319  10793     99.1    1.229  !DANGEROUS LOAD-DO NOT USE!
+02.0  108    69.36   3032    4084   67715  10856     99.3    1.210  !DANGEROUS LOAD-DO NOT USE!
+03.0  109    70.04   3063    4167   70204  10913     99.5    1.191  !DANGEROUS LOAD-DO NOT USE!
+04.0  111    70.72   3094    4251   72820  10965     99.6    1.172  !DANGEROUS LOAD-DO NOT USE!
+05.0  112    71.40   3125    4336   75536  11011     99.7    1.154  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    106    68.00   3048    4124   70020  10596     99.9    1.197  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    106    68.00   2880    3684   56474  10693     96.5    1.306  ! Near Maximum !

 

[vitor.gameiro]

Thank you all... you guys are awsome....
Now I will press the trigger a little bit more relaxed... but still be looking for signs...
I'm running 67gr and my loads with 560 are a little compressed... my rifle likes it better with CBTO at the short side... more bullet jump...
I will fill my fired case with H2O and have same data...
Thank you

 

[SJB358]

Looks like 560 is really in that sweet spot. I know I need to put some into a cart the next time I see it. I have a 300 WSM I haven’t mounted an optic on yet that needs to get warmed up.

 

[vitor.gameiro]

It shoots really good!
Haven´t tried yet... but we should take a look at N555... we mite have a pleasent surprise...
Hard to get powder, this days... and primers....

 

[vitor.gameiro]

Again my 300WSM... old issue comming into my mind ... please explain to me, because I didn´t undestand it very well...
A couple years ago I was trying to develop a load with 220gr Interlock RN and N560 to hammer same wildboars at mide range...
While working up with a ladder test, highest loads started to have carbon, first in the neck and has I was going up, also in case body... It was a second firing brass.
# poor sealling? But shouldn't pressure rise as charge goes up?
# not enough burning time?
Load ended up with lower charges... same what short in velocity (2670fps). Enough accuracy and precision but I didn't use it! I still have those interlock 220gr RN at home...
I can not (with my newby reloader experience) understand this...
Please share your thoughts on this one.
Thank you.