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    High end rifle issue

    Ya shure OK In 1972, I PCS'd to Fort Rich in Anchorage, I drove from Michigan. I took a CO2 pellet pistol across the Canadian border. The Canadian southern border guys made me promise to stop in Beaver Creek and show the Canadian norther border guys that I was taking it through into Alaska...
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    What seating depth is actually doing...actual node or just pass/fail?

    According the Gordon's, 308 with 41.52 grains of IMR 4064, Sierra 175 SMK from COL 2.700 to 2.850 in steps of 0.025 in. The purple line is velocity - note, velocity is not linear over time so using average velocity to model barrel time doesn't work. cartridge length / barrel time (ms) /...
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    High end rifle issue

    Frank is in Wisconsin. Is the border that difficult to penetrate? Is there something tricky about shipping a barrel to the States from Canada?
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    What seating depth is actually doing...actual node or just pass/fail?

    I am not agreeing or disagreeing - why do you think that increasing jump reduces barrel time? Are you thinking that if the bullet starts further back, it gets a running start and enters the rifled part of the barrel with some initial velocity? How does it work?
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    What seating depth is actually doing...actual node or just pass/fail?

    I'm going to make a comment that is about drawing a parallel only it will be obvious that the two things cannot be compared - sort of. In a nuclear weapon, all of the stuff that makes all of that energy happens within about 570 to 590 nanoseconds - about two thirds of a microsecond, about...
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    OCW Results (Confirm nodes)

    If you shoot ladders with small powder charge changes you can watch the groups get bigger and smaller and wander around on the target. As you said the barrel vibrations are very complex. The barrel is getting longer and shorter - vibrating along its long axis. As the bullet is shoved down the...
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    OCW Results (Confirm nodes)

    No habla on the "anti-node" lingo. I think about it this way - at your "two arrow" spots the barrel points down or up. And for some significant period of time - like the distance between those double-arrows - that direction does not change much. However, move the arrows around to 11 on the...
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    OCW Results (Confirm nodes)

    my point - there is no difference between 41.50 and 41.54. But as the range increases to say 41.47 to 41.57 groups get bigger. I use a Sartorius scale it is equivalent to the scale that most Autothrow people use.
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    OCW Results (Confirm nodes)

    Let's check your reference here. This article is about ignition probability of micron-sized aluminum powder in an oxidizing substrate used as fuel in a solid rocket motors evaluated over a 300K temperature range - more or less 540 degrees F. Over that temperature range probability of ignition...
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    OCW Results (Confirm nodes)

    FWIW, my load tolerance is plus or minus 0.02 grains - that is, 41.50 to 41.54. I think that 41.48 to 41.56 is still okay. I can probably go 41.47 to 41.57 with some reduction in accuracy but I can reliably do plus or minus 0.02 and it works for me so that is what I do. Suppose I say that I...
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    OCW Results (Confirm nodes)

    Let me ask a question. I know that the optimum charge weight for my brass and bullets in two of my guns is 41.52 grains of IMR 4064. If I change the charge to 41.7 or 41.3, the groups will be larger, actually much larger. Are you saying that I can shoot any charge weight I want and get good...
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    OCW Results (Confirm nodes)

    I have Kestrel instrumentation and I use it. At the beginning of todays session, conditions were 29.10 inHg absolute, 34F and 54% rh. That works out to 7.5 mils. After five warmup shots, my scope was set to 7.4 and I was getting center hits. If I change the AB temperature to 14F (that is 20F...
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    OCW Results (Confirm nodes)

    I started reading the thread early. At first I was "ho hum, good stuff but same old stuff". Then people started talking about OCW and I thought (feeling superior), "I'm smart, I know what these guys are talking about". Then some wild man comes in and says that all our children are ugly and...
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    Coolest reloading accessories youve seen?

    Notebook. Write down what I try. Circle the formulas that work. Use the formulas in the circles. It's like magic. Locktite. Keeps scope and base screw torque where I put it. When used with notebook, point of aim and impact stay the same. Pencil. Use with notebook. Practice. Use...
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    Load development at the range

    That usually happens because the Wilson seater has a smaller base than your full-length die - or, if you are neck-sizing, the seater die is smaller than your chamber. A short flat-blade screwdriver will extract the round from the die - pry under the rim. You want the brass to snugly fit into...
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    Surprising neck tension test ... (at least it surprised me)

    I have seen that too. I have had VERY few mis-fires - maybe 5 or so over a very long time. I recall one case where I had to go home and tap the bullet out of the rifling and that was a pistol and a lead bullet. In the other cases, the bullet did not move. In every case, it was my mistake - I...
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    Surprising neck tension test ... (at least it surprised me)

    Nifty device. It could be used to compare the force to insert versus the force to remove. Is that interesting? Seems to me that when you fire a round, the bullet is not pulled out of the neck, it is pushed out by pressure against the base of the bullet. So the device is measuring something...
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    How Many Firings???

    Full separations are rare. They may etch the chamber. I shoot my brass until (a) I get the shiny ring that means I will get a separation on the next shot or (b) I get a separation - partial or full - or (c) I get a neck split I put such brass into a gallon zip-lock bag. I think the bag...
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    Load development at the range

    I also load to magazine length. If it won't fit the magazine, I won't bother to shoot it. In my case 308 is loaded to about 2.820. The magazine will let me go longer (2.840 I think) but I don't want to risk a feeding issue if a round is too long. At matches, I always load and carry an extra...
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    Load development at the range

    I used to shoot at a range east of Denver, it was an hour drive from my house. The wind always blows in the plains. Behind the 100 yard range, they had a travel trailer up on stands. We would take our gear into the trailer and load there. We did not take nice scales. We were shooting H322...
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