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300 WSM Load test round #1

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300 WSM Load test round #1

Postby gtk » Sun Mar 10, 2013 6:23 pm

Sat I ran through my first loads for my new 300wsm

Barnes TSX 165 grain
Federal 215 magnum primers
IMR 4350 powder
Seated about .003 or so off the lands
Brass was once fired Winchester nickel

Book says 61 grains start, 68 grains max
61 grains velocity is 2889
68 grains velocity is 3148

I loaded 5 rounds of 61 grain, used two just to get on target
Then I loaded 3 rounds each from 61-66 grains

I had one case split with the 65 grain load, and one split with 66 grain.
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Re: 300 WSM Load test round #1

Postby gtk » Sun Mar 10, 2013 6:26 pm

So what's the next step? 65 grains is getting me 3074 fps, and seems plenty accurate. Would you try .1 grain increments between 65 and 66? Or just leave well enough alone?

I wonder if the split cases are from pressure , or just "one of those things"
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Re: 300 WSM Load test round #1

Postby Bullie » Sun Mar 10, 2013 6:31 pm

While case neck splits are common enough it is kinda strange with new brass.
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Re: 300 WSM Load test round #1

Postby gtk » Sun Mar 10, 2013 7:09 pm

It was "once fired" brass.
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Re: 300 WSM Load test round #1

Postby Bullie » Sun Mar 10, 2013 7:56 pm

Hmmmm.. full length resized? Might have set the shoulder back a bit too far
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Re: 300 WSM Load test round #1

Postby gtk » Sun Mar 10, 2013 8:23 pm

Yes. Full length resized.
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Re: 300 WSM Load test round #1

Postby stickers » Mon Mar 11, 2013 6:51 am

Have you measured your chamber and compared it to your COAL? I dont know a whole lot about short mags but my 22-250 is extrememly short chambered(Remington 700). What I am trying to say is shorten your overall a little bit and see what happens. I reload a lot of Barnes and a lot of them like to have a pretty good jump but some dont. The recommended overall by Barnes for my 22-250 I couldnt even hardly close the bolt.
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Re: 300 WSM Load test round #1

Postby gtk » Mon Mar 11, 2013 7:55 am

I don't have a way to measure the chamber. I'll probably just go with the 65 grain. Might load up a few 65.5 just to "see". I think the split case was possibly due to the round being fired in a different gun the first time.

The way I determined my OAL was , first I barely seated the bullet . Then I tired chambering the round. I kept seating a little deeper and trying to rechamber.

Once my bolt closed without any effort, I took a marker and colored the bullet, then chambered it. I kept seating deeper until there was no "marker" rubbed off when I chambered.
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Re: 300 WSM Load test round #1

Postby gtk » Mon Mar 11, 2013 7:15 pm

I was going to load some more tonight, and got to looking at the fired brass closely. Out of 20 rounds, 12 had very small splits in the necks :(

The cases that fired had grown in length quit a bit too. Don't know if that's normal. Then when i ran the good cases thru the resizer, it caused dimples in the neck. I am 100% sure I didn't have too much lube on it too. The only thing I think may have caused it, is I had the depriming pin way long

I think tomorrow I will go see if I can find some new brass to run thru it
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Re: 300 WSM Load test round #1

Postby gtk » Mon Mar 11, 2013 8:28 pm

gtk wrote:Then when i ran the good cases thru the resizer, it caused dimples in the neck. I am 100% sure I didn't have too much lube on it too. The only thing I think may have caused it, is I had the depriming pin way long

Reading more on this subject, there may be a possibility that some lube has plugged up the air hole in the die.
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