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Posted: 4/10/2013 3:35:15 PM EDT
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I have one of these theseAnd I can’t seem to get it to throw consistently. I am loading 308 with Varget. I need 44.7 grains, I get anywhere between 43.9 and 45.2 (45 is max load on Sierrea’s website) I cleaned it, run a few rounds through it first and keep it steady (bolted to a bench). Im worried that going over 45 is going to blow me up and need a meter that will be accurate. Also, what scales are you guys using? I have both a Dillon and RCBS beam scale. Both give me different numbers. I looked how to calibrate them and there is nothing on the manual. Any help is appreciated. Thank you.
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| I load competition rounds for my son . The ONLY thing I use this for is to "short load" before weighing the charge on a Sartorius while using an Omega trickler to finish up on each round.. I am amazed at the swings this "powder thrower" gives. It varies from 38-41 grains each and every time I use it. It serves my purpose but I would NEVER trust it as the ONLY measure for my reloading efforts. |
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I have the same problem with my Lee Perfect Powder Measure (I shouldn't be surprised as it is all made of plastic). I'm getting up to 1.5 grains of difference with the throws. I am about ready to invest in a Hordady Lock-n-Load powder measure and a couple of metering devices for swaping out calibers. |
| RCBS Charge master I know it's expensive but it's better than blowing up a gun or worse. I got tired of jacking around with extruded powders and manual throwers. This was the best money I've spent on reloading. |
| I use an RCBS Uniflow. I get a little bit of variation in charge weights with long stick powders like Varget , but I don't think it is as bad as what you are getting. Ball powders usually meter very close. Either way I set my throw just a little light and trickle up to the charge I want. I weigh every charge when I am loading rifle rounds, pistol rounds I will usually check every 10th throw or so. |
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I have a Lyman powder measure, and when using IMR 8208 XBR its always +/- .1 grain, typically spot on more often than not.
Hitting 45.2, and going .2 gr over one listed max charge isn't going to blow your gun up. Have you thought about throwing short and using a trickler? You can buy check weights for scales. Of course, the simple solution may be to use a powder that meters better... |
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Varget is known to measure poorly through a powder measure. Some people buy a $300 powder measuring gismo to measure it. I quit using Varget years ago. IMR-8208 XBR , Re-15 are short cut extruded measures + or - .1 gr and CFE 223, ball powder that measures exact is what I use. Same accuracy as Varget, none of the measuring woes. Good luck.
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I do the double tap up and down plus I put a funnel in the top of the hopper and keep powder in it, that way the powder level in the hopper is always the same throughout the batch. Then I drop a couple dozen charges or so untill the powder starts to feed from the funnel. The settling charges I put back in the funnel.
Then I set my charge weight by measuring 10 throws for an average. Example, if my intended single charge weight is 5.0 gns then 10 times that is 50 gns. I always recheck the charge weight every 50 round batch to make sure nothing has changed. This works very good for me. |
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I use a Uniflow, I see a .3 max variance with Varget, its all in technique, if I'm loading Varget I measure every charge, I set my measure to be just shy most of the time and trickle up. Sierra data tends to be very conservative, no reason not to check or show concern, but a little over is far more likely to jack your brass than suddenly detonate your gun if you're not showing pressure signs at your target weight.
Many scales are not accurate, accuracy is not as important as repeatability, as long as its sorta close to reading right and the load was developed with that scale, always work loads up with the equipment you'll be using. If you want to check accuracy comparing scales is an excercise in frustration, get a proof weight. |
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