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300 WM Expert

 
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  #8  
Old 04-15-2010, 02:31 PM
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Re: 300 WM Expert

I'm going to be using a Wyatt's extended mag box so no issues with length.

I can't set the base of the bullet to the shoulder neck intersection because the neck on a 300 WM is smaller than the diameter of the bullet. It's approximately .2683". Short of the .308" theoretical min amount in the case.

I also know I need to leave some room for throat erosion.

Another issue that I know of is that as a case nears max charge , generally speaking, accuracy increases.

The issue I don't want to deal with is having to fill the case so full, for accuracy, that brass life and shooting comfort suffer. Also with that barrel life will suffer.

I'm looking for a happy medium and before I choose the middle I wanted to get some thoughts from folks that have been there and done that.

Thanks

Tom
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  #9  
Old 04-16-2010, 11:22 AM
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Re: 300 WM Expert

Anyone? Can someone direct me to a person with experience on this matter.

Tom
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  #10  
Old 04-16-2010, 02:26 PM
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Location: Port Angeles, WA
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Re: 300 WM Expert

Not sure if your question is way over my head or if you are complicating the issue.

I ran the 180NAB in my 300WM with .015" jump from ogive to rifling. I belive that is the most crucial and accuracy defining area of concern. I wouldn't worry too much about the amount of bullet in the case, so long as it isn't a uber-compressed load you should be fine. I ran IMR4350 and RL22 in my 300WM and got good results with both powders.

If I completly missed the nail head and the board please clarify what you are asking for....

bullet jump to rifling?
neck tension?
best case capacity ratio for accuracy?
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  #11  
Old 04-16-2010, 02:53 PM
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Re: 300 WM Expert

Quote:
Originally Posted by statjunk View Post
I can't set the base of the bullet to the shoulder neck intersection because the neck on a 300 WM is smaller than the diameter of the bullet. It's approximately .2683". Short of the .308" theoretical min amount in the case.
Tom
Tom, I would talk to your smith and see what he recommends. From my recollection, the smith I used for my 300 WM suggested I set the junction of the boattail/shank to line up with the neck/shoulder junction, I think this is what Trueblue described. I couldn't do this due to magazine limitations. Anything deeper than this wouldn't increase the amount of neck contact but would help when you do start to get some erosion.

In my case, I didn't want to put in an extended mag box. My mag box was something like 3.590 max length so I set my OAL with the 180 AB at 3.500. I had the throat set to seat at -.020. With this arrangement, I picked up a fair amount of case capacity, it feeds nice, I don't have to worry about recoil on rounds in the mag, and I have extra room to follow the throat if it starts to erode.

Not sure if this helps with the info you're looking for, but hope it does.
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  #12  
Old 04-16-2010, 03:02 PM
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Re: 300 WM Expert

Moman,

You did actually help me. Until now my theoretical maximum was based on the base of the bullet. However I need to sink the bullet into the case bit more because you're right it has to be base off the boat tail/shank intersection.

I'm going to seat it deeper and see what the real difference is. I'm thinking at that point it won't matter since the difference will be much smaller.

I realize it's a pretty big oversight on my part but at least it's one less mistake I'm not going to make.

Thanks

Tom
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  #13  
Old 04-16-2010, 10:54 PM
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Re: 300 WM Expert

statjunk,

I think this is something that you need to talk over with the riflesmith that will be building your rifle. He can set the throat up for the load/bullet you wish to use when he's chambering your barrel. This is how I understand it anyway. JohnnyK.
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