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I am trying to develop loads with our new Walterhog bullets. And for these tests I like to be as consistent as possible - whether it makes that much of a difference is anyone's guess, but I like to keep all variable as few as possible. I got 100 new Hornady brass. We size them, trim them, and uniform the primer pockets. We then weigh them. 146.1 1 146.3 2 146.4 2 146.5 4 146.8 2 146.9 2 147.0 2 147.2 3 147.3 5 147.5 2 147.7 2 147.8 1 147.9 3 148.0 3 148.1 5 148.2 3 148.3 5 148.4 3 148.5 4 148.6 2 148.7 5 148.8 5 148.9 4 149.0 5 149.1 1 149.2 4 149.3 3 149.4 4 149.5 3 149.6 1 148.8 1 149.9 1 150.1 1 150.2 1 150.3 4 150.4 1 | ||
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My approach is different. I do not worry with the weight until I fire form. I will prep the brass a second time and then weigh the brass, insert a primer use a fine ball powder fill to the top, use a card to clean any powder off the top of the case. Weigh the fine powder and that will give you a good volume measurement for that case, usually two or three weight groups will develope. This should bring you overall spread of the case closer than the 4 or 5 grs. The internal volume of the case is the important part for accuracy, Just another way to split a hair intended for reloaders/ Handloaders with OCD.   | |||
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However: since the outside of the cases are all the same, especially once you size and or, fire form, any variation has to be internal; so if you just weigh them, you will automatically segregate them by internal capacity. I have friends with OCD; they rarely get much done. They might do one thing well, but never actually complete anything. | |||
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That is pretty consistent with what I see in my hornady brass. I just nark the highs and the lows use those as foulers or sighters and then shoot the 147-149s Mike Legistine actu? Quid scripsi? Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.  What I have learned on AR, since 2001: 1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken. 2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps. 3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges. 4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down. 5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine. 6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle. 7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions. 8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA. 9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not. 10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact. 11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores. 12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence. 13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances. | |||
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Our procedure is we repeat the weighing after each sizing, and segregate each 5 cases to be as close as possible for each group shot. Normally we purchase our brass in bulk, go through this procedure, and segregate the cases by weight. Generally we keep each 100 to be within one grain, and those are used for each rifle. Again, I am not sure how much weight difference there should be before one gets different results in shooting. But as the name of the game is consistency, we try to be as consistent as we can in controlling the variables that we can control. Our bullets are held to very close tolerances, in both weight and diameter. Each one is measured, and weighed. Again, we do this because the copper rods we buy do have slight variations, which we really have no control over at all. Also, it is not feasible to change our CNC machine program to suit each lot of rods we get. Here is an example. I am making 0.264 caliber bullets, and the current run is of what is supposed to be 10 grains. This what I got when I designed and made the original ones a few years ago. The current lot of copper we have is slightly more dense, and the weight of our bullets is 102 grains. They do vary from one rod to the other by up to 0.5 of a grain. What I do is just make them, and segregate them by weight into each box, and mark them. Like 102.1, 102.2 etc. We pack them that way. | |||
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The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Guns, Politics, Gunsmithing & Reloading Reloading Weight Distribution Of Hornady 6.5 Creedmoor
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