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300 RUM load development questions

 
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  #1  
Old 01-12-2013, 11:13 PM
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Join Date: May 2012
Location: Northern Colorado
Posts: 92
300 RUM load development questions

Hey guy's I've spent many hours on this site looking for valuable information, and have found much to work with
I have a 300 Rum newly rebarreled/ #4 Hart match grade, HS Precision stock, blueprinted action. I'm fairly new to handloading, but have learned many things the hard way. I have worked up a load with 180 gr Accubonds that are shooting well and showing promise. More testing to do on them.
I want to work on a 210 gr VLD load. Given the limited barrel life of the RUM I'd like to find a load withthe VLD in the least number of rounds possible. I have much to learn to become efficient in load development.
Heres where I'm at on it. I have new Nosler brass, and Redding competition dies. Right off the bat I am having concentricity problems with seating VLD's I also have copy of Bergers 1st edition manual. I still dont know wbere to begin. In the manual it seems to say on the same page to find your seating depth first, then work on charge. 2 paragraphs later seems to say the opposite. They also recommend .1 to .3 grain charge increments. It seems like I'm seeing an awful lot of rounds fired just as starters.
I only have acces to a 200 yd. Range so maybe a ladder test is out of the question. My thought is a 200 yd round robin test should mostly give the same result?
If I seat VLD's to mag length which would be my preference I'm already. 119 off lands. Given the seating depth sensitivity I'm still not sure how to begin.
I think the first step will be to solve the concentricity issue. I contacted Redding 2 weeks ago but have yet to get a response.
For you guys experienced with the VLD's I could use some good solid advice in how to begin on seating depth and charge in crements to begin my tests. I dont want to go through this barrel by the time I get a load down, or go through a couple hundred rounds and decide I need to go to something else.
I appreciate any help I can get.
Thanks
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  #2  
Old 01-12-2013, 11:22 PM
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Join Date: Mar 2008
Location: Helena, AR
Posts: 278
Re: 300 RUM load development questions

Not to sound like too much of a smart ass but, try some hybrids in the 0.015 off the lands. I think your load development will be a lot quicker. The vlds can be tricky in some guns.
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  #3  
Old 01-13-2013, 07:17 AM
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Join Date: Jan 2011
Location: texas
Posts: 396
Re: 300 RUM load development questions

I had some of the same issues you had with the 210 VLD s for my 300 ultra . They are picky with the jump to the lands. With having to load mag lenght you will have to work hard at the seating depth . It's frustrating at times trust me I know . You might need to get a Wyatt's extended box put in they are around 200.00 this will allow you to load closer to the lands .

With your runout issue not sure what to tell you , I started loading with once fired brass full lenght resized then neck sized to .333

My runout is .003-.005 with Remington brass shot from my gun .

Like was Said if you want an easier time of loading bergers get you hands on some 215 hybrids , here is what they do out of my gun , good luck with you quest .
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  #4  
Old 01-13-2013, 07:55 AM
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Join Date: Jan 2010
Location: Leominster mass, originally Salisbury Maryland
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Re: 300 RUM load development questions

First things first! Your runout issue, is probably q result of your resizing process, and it is hard at times to correct it. Typically what happens is when you resize, and when you pull the expander ball back through the case, it sometimes " pulls " the neck a little out of square, or centerline, with the body of the brass. So, then when you seat the bullet, it is then exaggerated. You need to ensure that your expander ball is dead center of your die. Also , lubricate the INSIDE of the neck before the resize stage, that way, the expander will not bind, and that's usually what starts the distortion.
As to the jump, when I used to load VLD's in my RUM, I loaded to box length, then manipulated the load in small increments to find the "sweet" spot. The RUM is free bored by design, and unless you are single feeding, you can not touch or come close to the throat, and still fit into the box.
Read your instructions that came with your dies to ensure you are centered correctly with the expander, and that will help out a lot. Good luck, and enjoy the ride.
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  #5  
Old 01-13-2013, 08:17 AM
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Join Date: Jan 2011
Location: texas
Posts: 396
Re: 300 RUM load development questions

Quote:
Originally Posted by 7stw View Post
First things first! Your runout issue, is probably q result of your resizing process, and it is hard at times to correct it. Typically what happens is when you resize, and when you pull the expander ball back through the case, it sometimes " pulls " the neck a little out of square, or centerline, with the body of the brass. So, then when you seat the bullet, it is then exaggerated. You need to ensure that your expander ball is dead center of your die. Also , lubricate the INSIDE of the neck before the resize stage, that way, the expander will not bind, and that's usually what starts the distortion.
As to the jump, when I used to load VLD's in my RUM, I loaded to box length, then manipulated the load in small increments to find the "sweet" spot. The RUM is free bored by design, and unless you are single feeding, you can not touch or come close to the throat, and still fit into the box.
Read your instructions that came with your dies to ensure you are centered correctly with the expander, and that will help out a lot. Good luck, and enjoy the ride.


What he said !!!
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  #6  
Old 01-13-2013, 01:57 PM
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Join Date: May 2012
Location: Northern Colorado
Posts: 92
Re: 300 RUM load development questions

Thanks guy's. I may try the hybrids, if I can find them. Have not been able to find them yet.;
As far as runout goes. I am starting with new Nosler brass ready to load. Already neck sized and necks are concentric. The runout is after seating. Maybe I need a different seater plug.
Heres another question, being relatively new to handloading. Can I resize without the expander ball? Is it a neccessity? It seems to me that it is what it is, and does not appear to be adjustable within the die body. Could it be left loose to in a since float in the die body?
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  #7  
Old 01-13-2013, 05:19 PM
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Join Date: May 2012
Location: N.D.
Posts: 3,156
Re: 300 RUM load development questions

First off, do what the others are saying and dry lube your necks with graphite or brush a bit of case lube through the necks and toss 'em it the tumbler for an hour. Then uniform your length at .010' under or so. If you can't square up your bullets the load won't be as good. That said I don't even have a concentricity guage; I get 1/2 moa in a good rifle without one with my rock-chucker.

I've been able to get damn near any pill I've put through my rem 300 rum to 1/2 moa quickly(usually 9 shots). I really like the 180 hornady with rl25 in rem brass lit by a 215. For long range I'm working with the 190 hornady and 225 hornady. All are capable of 1/2 to 2/3 moa consistantly in an un-braked 9# rifle.
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