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Do any of you guys that load a ton monitor lots for consistancy. I hear that varget is all over the place lot to lot, and some companies publish lot consistency as a big selling point. If anyone knows it would be this group. How close is good and what do you consider not good.
I've even heard wild stories about people buying 8 lb of singles and mixing it in an 8-pounder so they don't have to reformulate a bunch of timesI can’t answer your exact question but I’ve shot a lot of varget. I’ll get burned for this but it does vary, I try to buy quantity of same lot number but if I have a couple of one lot number and a couple of another I mix it all together then I have my own lot number. I load with chronograph and if I need to add or subtract a tenth or do to keep my 6brx at my selected velocity that’s what I do.
Wayne
I've even heard wild stories about people buying 8 lb of singles and mixing it in an 8-pounder so they don't have to reformulate a bunch of times
I'm not trying to condone or dissuade anybody from doing anything I'm just trying to get information. People that shoot competition are already exceeding book Max in some cases and I could see the danger and shifting lots and not backing off.Military tested 10 different lots of H4831. Very wide spread in velocity & pressure from the slowest to fastest.
Possible dangerous pressures.
I would never blend or mix lots of any powder.
https://apps.dtic.mil/docs/citations/ADA572333
"To consider the likely pressure variations, consider that QuickLoad V3.6 predicts a muzzle
velocity of 3174 ft/s and a peak pressure of 54371 psi for 79 grains of H4831 using the 155
grain AMAX in the .300 Win Mag. This is very close to the 3177.5 ft/s velocity that results from
averaging the measurements over all six lots of powder. However, compensating for possible
lot to lot velocity variations requires a range of powder charges spanning from 77.5 to 80.5
grains of powder and a range of pressures from 51063 psi to 57910 psi. It is possible that a
load showing no signs of pressure with one lot of powder might not be safe with another lot of
powder. At their web site, Hodgdon recommends working up new loads when the lot number
of any component is changed, and it is evident that this includes a new lot of Hodgdon."
I'm not trying to condone or dissuade anybody from doing anything I'm just trying to get information. People that shoot competition are already exceeding book Max in some cases and I could see the danger and shifting lots and not backing off.
Sorry if my statement sounded harsh. Just saying its not to my liking. Just my 2 cents.I'm not trying to condone or dissuade anybody from doing anything I'm just trying to get information.
Indeed this is exactly what I was looking for and this would be the level of shooters that went through enough volume and kept enough records to provide some quality useful insightHonestly, this request is basically asking for quality control data.
The manufacturers may have it, but they sure as heck wouldn't share it. If an independent source tries to measure it themselves, I suspect they'd be told to take it down.
I think we're stuck with the basic paradigm of "work up a new load for each lot #". It should be a matter of tweaking powder charge.
I can’t answer your exact question but I’ve shot a lot of varget. I’ll get burned for this but it does vary, I try to buy quantity of same lot number but if I have a couple of one lot number and a couple of another I mix it all together then I have my own lot number. I load with chronograph and if I need to add or subtract a tenth or do to keep my 6brx at my selected velocity that’s what I do.
Wayne
Honestly, this request is basically asking for quality control data.
The manufacturers may have it, but they sure as heck wouldn't share it. If an independent source tries to measure it themselves, I suspect they'd be told to take it down.
I think we're stuck with the basic paradigm of "work up a new load for each lot #". It should be a matter of tweaking powder charge.
I'm talking about a scientific test that standardized the compare one lot to another I don't care if they use a 1cc square a 1M Square they have a the ability to run a standardized test to know from lot to lot if the speed is increased or decreasedI suspect that even the manufacturers don't have a single burn rate value that would be useful to most shooters. Powder burn rates are dependent on many factors, pressure and temperature being two very critical ones. The exact same Lot# of powder is likely to have different burn rates in two different cartridges, especially if they are of markedly different size and/or are loaded with different weight or diameter bullets. There are too many variables involved to have a manufacturer-generated "one-size-fits-all" kind of value, so we test when we get a new Lot# of powder, and we generally try to buy as much quantity of a new Lot# as we can so that it lasts a while. It can be a minor PITA at times, but it's not really all that bad in the grand scheme of reloading.
You plan on getting oneSearch here also https://discover.dtic.mil/
I'm talking about a scientific test that standardized the compare one lot to another I don't care if they use a 1cc square a 1M Square they have a the ability to run a standardized test to know from lot to lot if the speed is increased or decreased