Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Techniques For Reloading


Reply

Same volume of powder, different weight?

 
LinkBack Thread Tools Display Modes
  #1  
Old 10-27-2009, 05:16 PM
Gold Member
 
Join Date: Sep 2009
Location: McLean, Virginia
Posts: 985
Same volume of powder, different weight?

Hello,

I just bought a lee powder measure kit, because I have read several times that some of the most accurate loads are made using volume measures. When I weigh the volume-measured charges I get different weights all the time, with the lee dippers it varies by up to 1.5grains... Using the case activated powder measure on my hornady lock n load ap press the charges still vary by .1 grains. Is this acceptable? I will do accuracy testing next weekend to see how accuracy is. is it normal for weight to vary like this? What can I do to get more uniformity?

Thanks,
Oliver Lottermann
Reply With Quote
  #2  
Old 10-27-2009, 05:30 PM
Silver Member
 
Join Date: Mar 2007
Posts: 430
Re: Same volume of powder, different weight?

Variation of weighed volumes should be due to humidity. When you use several means to measure by volume and the inconsistencies are not uniform, you are dealing with co-variation. i.e., there is more than one source of variation. Your Hornady LnL measure's consistency simply brings to light the high variation in the other measured volumes.

If by Lee powder measure kit you are referring to the boxed set of dippers, what you have learned is that the form of measurement has high variation; this may be reduced with practice. The dippers are effective in conjunction with the use of a trickler for weighing the charges.

Last edited by Winchester 69; 10-27-2009 at 05:38 PM.
Reply With Quote
  #3  
Old 10-27-2009, 08:09 PM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,337
Re: Same volume of powder, different weight?

I think you will only know by shooting over a chronograph.

I wonder which would provide lowest ES: The exact same number of powder granules, or the exact same weight?
And does moisture affect granule volume in a way that counters weight change? That is, if 235 dry granules fit a given volume, would they fit the same wet?

It's an interesting topic. Maybe I'll count out a pet load & fiddle around with this..
Reply With Quote
  #4  
Old 10-27-2009, 09:50 PM
Silver Member
 
Join Date: Sep 2009
Location: Cheraw S.C.
Posts: 285
Re: Same volume of powder, different weight?

if you are useing the little dippers,this is what I do.use the chart and find the dipper needed for the charge.then I trickel the rest in.if one was only loading to just plink I wold just dip and charge a case.but I would scrape off the top of the dipper with a knife edge.but you are looking for accuracy and not to just plink.and for me most of the time I don't really worry about .1 grain.maybe I should but it hasn't messed with accuracy from what I can tell.
do you have a trickler? if not I may be able to get you one.I really don't use mine that much anymore.I just add with a dipper really slow to get the charge I am looking for.just let me know if you need it.
John
Reply With Quote
  #5  
Old 10-27-2009, 11:07 PM
Gold Member
 
Join Date: Sep 2009
Location: McLean, Virginia
Posts: 985
Re: Same volume of powder, different weight?

John,

I do have a powder trickler, and this is what I did to load my rounds for my ladder testing but I'm curious as to what gives better consistency, the same volume of powder or weight. Mikecr asked the exact question I wasn't able to formulate properly. What gives the least spread in velocity? The same weight or the same volume? If you can't have both. I have loaded 30 by volume at are at an average weight of 41.5grains each and I will load another 30 by weight of 41.5grains and see the average group sizes. The measure on my press is looking good since weight varies by no more than .1 grain and volume is the same charge to charge. Interesting stuff.. If anyone has done chronograph tests or knows someone who has please post the info or a link.

Thanks,
Oliver
Reply With Quote
  #6  
Old 10-27-2009, 11:42 PM
Silver Member
 
Join Date: Sep 2009
Location: Cheraw S.C.
Posts: 285
Re: Same volume of powder, different weight?

I think that I'll put my money on weight. this is whatworks for me.but I think you have a good idea on things.keep it up and you will be shooting with the best.
John
Reply With Quote
  #7  
Old 10-28-2009, 02:52 AM
Gold Member
 
Join Date: Feb 2008
Posts: 523
Re: Same volume of powder, different weight?

Winchester69 has it right!
Even if you weigh your powder precisely on one day, on another day it MAY be different due to humidity changes.
Whether it's weighed or measured, a .1gr+/- is not going to show any significant change in velocity, but due to the same humidity change, it may show a significant vertical dispersion on target due to changes in combustion.
This is a little known fact by many loaders, that's why in benchrest they tune their loads on the day, not the week before!
I always use the same setting on my measure, whether it corresponds with the initial weight setting or not! I have had differing weights of 1.5gr's on any given day, and it doesn't seem to affect accuracy or velocity a great deal. Rarely does this pose a problem once a 'node' is found, a good 'node' will run 1gr+/- without affecting anything drastically.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Same volume of powder, different weight?
Thread Thread Starter Forum Replies Last Post
Berger VLD's and powder volume jaycoux Reloading 0 11-19-2010 12:47 PM
need help with powder weight and type long range erik Reloading 2 07-11-2010 12:42 PM
If bullets are designed by volume vs weight? royinidaho Rifles, Bullets, Barrels & Ballistics 3 01-02-2010 09:27 PM
BH 209 by Weight or Volume shootinwv Muzzleloader Hunting 5 12-30-2009 07:56 PM
Do you guys reload by weight or by volume? 243yote Reloading 7 10-21-2009 06:46 AM


All times are GMT -5. The time now is 01:08 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC