Questions about .300 win mag loads

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skinin_bonz

New member
I've got 3-5 loads on my hornady brass. Im having a few miss fires. I dont think the pin is hitting hard enuff.
So I was priming a few tonight and 2 wouldnt even hold a primer. And most of the rest the primer went in without any resistance.
Have I reached the end of their life...or over pressured them and streched out the pocket? Any advise?
78.5 g h1000 208 amax
 
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Originally Posted By: skinin_bonzI've got 3-5 loads on my hornady brass. Im having a few miss fires. I dont think the pin is hitting hard enuff.
So I was priming a few tonight and 2 wouldnt even hold a primer. And most of the rest the primer went in without any resistance.
Have I reached the end of their life...or over pressured them and streched out the pocket? Any advise?
78.5 g h1000 208 amax

Yep those are toast. Throw them in the recycling bucket. If you are loosening up that fast you need to back it down some.

Greg
 
a lot of these I shot primarily in test loads and I know some of them got pretty hot. I tried 2 different bullets two different powders so they've been shot several times. how many loads do you normally get out of large brass?
 
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Originally Posted By: GLShooterOriginally Posted By: skinin_bonzI've got 3-5 loads on my hornady brass. Im having a few miss fires. I dont think the pin is hitting hard enuff.
So I was priming a few tonight and 2 wouldnt even hold a primer. And most of the rest the primer went in without any resistance.
Have I reached the end of their life...or over pressured them and streched out the pocket? Any advise?
78.5 g h1000 208 amax

Yep those are toast. Throw them in the recycling bucket. If you are loosening up that fast you need to back it down some.

Greg

+1
Hodgdon shows 77.0 gr. of H 1000 as maximum w/200 gr. bullets.

Regards,
hm
 
Originally Posted By: skinin_bonz how many loads do you normally get out of large brass?

My 300WM loads are stiff, but safe with no pressure signs/ bolt life ad within book recommendations. I have 100 cases past 7 loads and have only culled one.

You are pushing them too hot if losing the pockets that fast.

Guns differ, the book is only a guide. Some guns will run into pressure signs below book max, some above. It is good to also track your velocity, and since "nothing is free", if you are getting max load velocities with less powder, you are probably already running max pressure and will be over if you take the load to book max. I've seen this happen more than once.
 
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I dont think im too far off. And once I got pressure signs I backed off to the most accurate charge. Thanks for the input....please keep it comming
 
since this brass was used for load development. I know it got too hot a time or two so now that I found one within range I think I will load 5 and shoot them several times and keep my eye on them. I'm hoping they will last quite a bit longer.
 
Quote:Guns differ, the book is only a guide. Some guns will run into pressure signs below book max, some above. It is good to also track your velocity, and since "nothing is free", if you are getting max load velocities with less powder, you are probably already running max pressure and will be over if you take the load to book max. I've seen this happen more than once.


Excellent point.

My only Hodgdon book is an old one (#26).

The loose primer pockets are definitely a sign that the case(s) has/have been subjected to high pressure at some point in time; perhaps, as you point out in previous test loads.

Regarding case life, I generally adjust my sizing die so that the case headspaces on shoulder of case, as opposed to the belt on belted cases. This helps extend brass life (reduces stretch) considerably (but has no effect on primer pockets). My best guess is that I get 7-10 reloads per case and failure is usually due to split necks (I do not anneal).

If you continue to experiences loose primers, I'd back off and be especially watchful when summer temps return.

Regards,
hm
 
You might be able to run them through a swagger and get another load or two out of them. I only get 3-5 out of my federal brass but I run 77.3gr of retumbo with a 230 berger
 
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Federal brass is soft...but it can be found.

Buy New Winchester, if/when the pockets get lose, try the Win mag primer, they are a tad larger and will feel "tight" once again.
 
Originally Posted By: ackleymanFederal brass is soft...but it can be found.

Buy New Winchester, if/when the pockets get lose, try the Win mag primer, they are a tad larger and will feel "tight" once again.

I think the Tula LRM primers might be a little tighter fit too.
 
I tried the Winchester Magnum primers and it did not help some of them will still hold a primer and shoot but they do not go in as tight as they should. anything that left black powder residue on the head stamp I threw out anything that wouldn't hold a primer I threw out the other ones I'll get one more loading out of hopefully and they'll be joint. I loaded 5 rounds in once fired factory brass that I traded someone for I'm just going to count how many loads I get out of them.
 


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