300 wsm & H4350

Just picked up a m70 300 wsm that I'm still working on getting ready for the range. In the mean time I loaded some 168 e tips with h4350. Started at 61.5g up to 63.5g.

Im pretty much dedicated on using this powder since I use it for my dad's 30-06 and I've read a lot of good things about it for the 300 wsm. My issue is I haven't found much load data with it and the e tips. I've read the e tips can top out in the mid range of powder weights; am I ok with starting with these weights? Is it likely I can push them harder? I've read in several locations of guys using up to 65g with 180g accubonds and I know e tips produce different pressures. It's my first time trying an all copper bullet and id really like to use these, they just seem about the perfect bullet for this cartridge.

For what it's worth, I'm using winchester cases and cci 250s. And seated these bullets at 2.865 which is .100 off lands based on my not so professional measurement. No I don't have a gauge for that, only been reloading a bit over a year. Just looking for some in put I guess. Thanks

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H4350 is a good powder for the 300WSM. I have found that standard rifle primers will work just fine. You actually generate slightly more pressure with the magnum primers. Excellent cartridge and this should be a great load for you.

I find the Hodgons Reloading Guide to be very conservative but this should give you an idea of where you can go.
BULLET WEIGHT
180 GR. NOS E-TIP
Manufacturer

Starting loads Pwd. Bullet Diia C.O.L. Grs. Vel pressure Grs. vel pressure

Hodgdon H4350 .308" 2.860" 59.0 2,751 54,900 PSI Max 63.7C 2,925 63,800 PSI

DrMike":3bc7568b said:

Code:

Cartridge          : .300 WSM (CIP)
Bullet             : .308, 168, Nosler E-Tip 59415
Useable Case Capaci: 69.745 grain H2O = 4.528 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Hodgdon H4350

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   93    58.68   2676    2671   46021  10240     94.9    1.228
-09.0   94    59.33   2705    2729   47490  10359     95.3    1.210
-08.0   95    59.98   2734    2788   49005  10475     95.8    1.193
-07.0   96    60.64   2763    2847   50570  10587     96.2    1.175
-06.0   97    61.29   2791    2907   52185  10697     96.5    1.159
-05.0   98    61.94   2820    2967   53852  10803     96.9    1.142
-04.0  100    62.59   2849    3028   55573  10906     97.2    1.125  ! Near Maximum !
-03.0  101    63.24   2878    3089   57351  11006     97.6    1.109  ! Near Maximum !
-02.0  102    63.90   2907    3151   59187  11102     97.9    1.094  ! Near Maximum !
-01.0  103    64.55   2935    3214   61084  11194     98.2    1.078  ! Near Maximum !
+00.0  104    65.20   2964    3277   63044  11282     98.4    1.063  ! Near Maximum !
+01.0  105    65.85   2993    3340   65070  11366     98.7    1.048  !DANGEROUS LOAD-DO NOT USE!
+02.0  106    66.50   3021    3405   67164  11446     98.9    1.033  !DANGEROUS LOAD-DO NOT USE!
+03.0  107    67.16   3050    3469   69329  11522     99.1    1.018  !DANGEROUS LOAD-DO NOT USE!
+04.0  108    67.81   3078    3534   71569  11594     99.3    1.004  !DANGEROUS LOAD-DO NOT USE!
+05.0  109    68.46   3106    3600   73886  11661     99.4    0.990  !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    65.20   3088    3557   74067  11060    100.0    0.991  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    104    65.20   2796    2917   52214  10982     93.0    1.155

H4350 is a good powder for the 300WSM. I have found that standard rifle primers will work just fine. You actually generate slightly more pressure with the magnum primers. Excellent cartridge and this should be a great load for you.

Click to expand...

Can you get top velocities with standard primers though?

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QuickLoad projects velocities on the basis of the coolest primer (lowest brisance) that will reliably ignite the powder column. You will actually obtain higher velocities with magnum primers. However, higher velocities mean higher maximum chamber pressures. There is no free lunch.

DrMike":2kz3hc3l said:

QuickLoad projects velocities on the basis of the coolest primer (lowest brisance) that will reliably ignite the powder column. You will actually obtain higher velocities with magnum primers. However, higher velocities mean higher maximum chamber pressures. There is no free lunch.

Click to expand...

Ok, I knew that i just wasn't sure how quickload worked I guess. From what I've read I should be able to get 3100 pretty easily slinging 168s, so I'd be pretty happy with that as I don't want to push it too hard

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I do have a chrono which I've learned is a very valuable tool in working up loads

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theddguide":3bb9ux1i said:

DrMike":3bb9ux1i said:

QuickLoad projects velocities on the basis of the coolest primer (lowest brisance) that will reliably ignite the powder column. You will actually obtain higher velocities with magnum primers. However, higher velocities mean higher maximum chamber pressures. There is no free lunch.

Click to expand...

Ok, I knew that i just wasn't sure how quickload worked I guess. From what I've read I should be able to get 3100 pretty easily slinging 168s, so I'd be pretty happy with that as I don't want to push it too hard

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Click to expand...

I get around 3150 with MRP at max pressure (test-barrel) with the 165 BT.
N160 works similar. So yes - 3100 is possible.

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I

When I used the 168’s in my old 300 WSM’s they acted like 180 grain jacketed bullet pressure wise. Pretty danged accurate. Pretty sure I used 17, but H4350 should be real good.

SJB358":wqcqnzgn said:

When I used the 168’s in my old 300 WSM’s they acted like 180 grain jacketed bullet pressure wise. Pretty danged accurate. Pretty sure I used 17, but H4350 should be real good.

Click to expand...

Good to know. I've just started working up loads, so far have shot up to 64.5g and velocity was only about 3020. Going to try 65 and 65.5 next whenever I get a chance. 3100 is my goal provided there's no pressure signs. Accuracy so far has been pretty ok but conditions haven't been perfect either. Was that 168 e-tips? Any idea what your load was? How was accuracy & velocity?

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I’ll dig around but I’d bet a dollar I used RL17 around 65-66 grains.

I’m pretty sure I was in the 3100-3150 range and they shot like laser guided missiles. It’s one of the good ones I wished I had back. Shot everything great but 200 ABs and in a fit I sold it.

SJB358":wal9g66j said:

I’ll dig around but I’d bet a dollar I used RL17 around 65-66 grains.

I’m pretty sure I was in the 3100-3150 range and they shot like laser guided missiles. It’s one of the good ones I wished I had back. Shot everything great but 200 ABs and in a fit I sold it.

Click to expand...

Ouch! That sounds like it was a great rifle. I've been toying with the idea of trying 200 grain partitions particularly as black bear medicine along with having a good load with the etips.

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I shot one group with the 168 gr. E-tips in my 300 WSM. I used 64.0 gr. of Reloder 17 and got an average of 3093 ft/sec with and ES of 14 ft/sec. The QuickLOAD projection for my set-up shows a max load of 64.8 gr. of Reloder 17 at 3135 ft.sec. The group showed a lot of promise but I haven't gotten back to it.

Dan