7mm RUM reloading difficulties - Kawasaki ZX-10R.net
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post #1 of 18 Old 09-26-2005, 06:00 PM Thread Starter
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Question 7mm RUM reloading difficulties

I know some of yall shoot, thought maybe yall did some reloading and could help me out with this.

So heres the deal...

I just started trying to reload rounds for my 7mm RUM. I ran across this problem of messing up the case when I load the bullet in.

I am using RCBS Dies. I resize the case, the shell will feed fine, but as soon as the bullet goes in, I cant lock the bolt down, or its really hard to do.

This doesn't happen every round but Id say 3/5 times it will.

Now its not the bullets, theyre the right size, and if I take the shell that didn't work, take the bullet out, resize the case, and it will work again.

So my assumption is that when I am pressing the bullet into the case there is enough friction in pressing the bullet that its deforming the case.

So my question is, is there a lubricant for the bullet for cases such as this? Is there something I've missed? I know the neck is clean and deburred, so the friction is the only thing I can find to blame it on, but I have never experienced this before.

Any helps greatly appreciated!




For every species of beasts and birds, of reptiles and creatures of the sea, is tamed and has been tamed by the human race. But no one can tame the tongue; it is a restless evil full of deadly poison.
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post #2 of 18 Old 09-26-2005, 08:31 PM
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Are you using case lube?

You didn't say you used case lube before resizing, are you ? If not that may be your problem, I haven't reloaded much but you may want to try these

http://www.midwayusa.com/eproductpag...eitemid=197010
with this
http://www.midwayusa.com/eproductpag...eitemid=290522
or this
http://www.midwayusa.com/eproductpag...eitemid=204960


You may want to ask this forum below, go to the "big bore rifles" section and ask them, there is a LOT of reloading experts there, they will for sure help you more than I can

http://www.marlinowners.com/board/

.............

Liberal-- A person who is so open minded that their brains have fallen out.
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post #3 of 18 Old 09-26-2005, 08:33 PM Thread Starter
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Cool, thanks.

Yes I did use case lube.

I also posted this here...
http://longrangehunting.com/ubbthrea...0&page=0#83808




For every species of beasts and birds, of reptiles and creatures of the sea, is tamed and has been tamed by the human race. But no one can tame the tongue; it is a restless evil full of deadly poison.
James 3:7,8

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post #4 of 18 Old 09-26-2005, 09:06 PM
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Are you sure that you are seating the bullet far enough? Are there impressions on the bullet from the lands? Failure to close the bolt is usually due to headspace or bullet seating.

Dave

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post #5 of 18 Old 09-26-2005, 09:15 PM Thread Starter
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Quote:
Originally Posted by Cryptoman
Are you sure that you are seating the bullet far enough? Are there impressions on the bullet from the lands? Failure to close the bolt is usually due to headspace or bullet seating.
I have tried many different overall lengths. It is my impression that that is not the problem. I have tried everything from factory length to over 3.9" and it doesn't seem to effect it.




For every species of beasts and birds, of reptiles and creatures of the sea, is tamed and has been tamed by the human race. But no one can tame the tongue; it is a restless evil full of deadly poison.
James 3:7,8

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post #6 of 18 Old 09-26-2005, 09:37 PM
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What caliber is it, 7mm Remington Magnum? Are you neck sizing only or full length? You need to check for a tight neck. An unfired bullet should go easily into the neck of a fired case before resizing. You could also have a long case that is headspacing on the neck instead of the shoulder. Check case length. If it is touching the rim of the neck it will actually crimp the bullet slightly and again result in high pressure. As someone else suggested, look for rifling marks on the ogive of the bullet of one of the rounds that was difficult to chamber. If the bullet is touching the rifling it will cause high pressure and may pull a bullet in a round you chamber but don't fire.

You can lube the inside of the neck. Use graphite powder. They make a special tool with a brush that goes into the case neck for this.
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post #7 of 18 Old 09-26-2005, 09:39 PM
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I'd also check case length, neck burrs, bullet diameter and the forward end of your chamber. The RCBS Precision Mic is a nice tool to have for getting your bullet seating right.

I bet the ballistics on that puppy are pretty nice. I have the regular 7mm magnum, and it's more than I really care to shoot.

Dave

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post #8 of 18 Old 09-26-2005, 09:52 PM Thread Starter
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I have been full length sizing.

Even if I had been only neck sizing though, since the brass had been fired in my gun, would that matter? I thought that neck sizing was so you could keep the brass shaped like your chamber?

and about the ballistics...pretty fun...kicks harder than anything ive ever shot!

I bought it b/c of its very flat trajectory!



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For every species of beasts and birds, of reptiles and creatures of the sea, is tamed and has been tamed by the human race. But no one can tame the tongue; it is a restless evil full of deadly poison.
James 3:7,8

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post #9 of 18 Old 09-26-2005, 10:03 PM
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For best accuracy neck size. The rounds will get progessively harder to chamber but that is normal. Since you are full length sizing you need to make sure you ain't pushing the shoulder back too much. You should just be touching the shoulder. You can check this by smoking an unfired case with a candle then adjusting the die 'til it takes off the smoke. If I was making a wild ass guess I would pick the long case. I would start out and trim all the cases to minimum length as they will grow with resizing.
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post #10 of 18 Old 09-26-2005, 10:28 PM Thread Starter
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Quote:
Originally Posted by swjohnsey
For best accuracy neck size. The rounds will get progessively harder to chamber but that is normal. Since you are full length sizing you need to make sure you ain't pushing the shoulder back too much. You should just be touching the shoulder. You can check this by smoking an unfired case with a candle then adjusting the die 'til it takes off the smoke. If I was making a wild ass guess I would pick the long case. I would start out and trim all the cases to minimum length as they will grow with resizing.
This could be the case.

Ill check this and then try the lube.

Thanks alot guys for your help!




For every species of beasts and birds, of reptiles and creatures of the sea, is tamed and has been tamed by the human race. But no one can tame the tongue; it is a restless evil full of deadly poison.
James 3:7,8

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