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  1. B

    I have a Zero Obsession Lately

    I always zero at 100 yards for everything. I make range cards for every weapon/ammo combination. I have all weapons in Applied Ballistics. However you define zero and achieve it, sometimes you fire a shot and it goes astray. In order to check, you shoot a target at 100 and zero is not...
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    Help Needed - Sticky Bolt CLOSE

    Assuming that you are using 7/8x14 dies, half a turn should get you about 35 thousands. Doing the math: one divided by fourteen equals 0.0714 so one turn is 0.714 0.0714 divided by one half a turn is 0.0357. But a half-turn got you only 7 thou, not 35 thou. Something is strange. Your...
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    Factory ammo won’t chamber

    It won't chamber because the factory ammo is too big in some dimension. could be overall length - the bullet hits the lands before the bolt closes. You have to force the bullet deeper into the case. could be the "headspace length" the case-shoulder-to-base is longer than your chamber...
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    Ever so faint ejector mark

    As far as I know, there are two reasons for an ejector mark - pressure and burrs around the ejector hole. In the case of pressure, there is enough pressure inside the case to force the case base into the ejector hole. Due to high pressure the case is expanded in both radius and length so...
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    300 prc dies?

    Micron uses JGS resize reamers to cut their dies. I use a 300 PRC SAAMI JGS chamber reamer, I am a big fan of JGS work and products. The Micron die would probably work for me but, keep in mind, sizing dies have to match the chamber. If the chamber was cut with a reamer from a different...
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    Please Help!

    Make sure you use enough lube. If you get dents in the shoulder, that's too much lube but make sure there is enough. If you have any Imperial, that works well for me.
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    High end rifle issue

    Mr. Green, I am currently shooting three Bartlein barrels - two 308s and a 300 PRC. They all do what they are supposed to do. I have a 300 Win Mag that shot well for almost 2,500 rounds then it just wouldn't - as you know, that is a lot of rounds for a 300 Win Mag. I have a nearly unfired 300...
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    What seating depth is actually doing...actual node or just pass/fail?

    I plan to do a test. I have a bunch of 308 already loaded to 2.820 all with 41.52 +- .02 gr IMR 4064 powder charges. I am going to take 10 rounds and reduce the COL to 2.810, another 10 to 2.800, and another 10 and to 2.790. I will hang paper at 500, shoot groups, and see what happens...
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    Seating depth node?

    Maybe it just accidently worked out that way. Dumb luck works too.
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    300 prc dies?

    The Wilson full length die is really nice. I use the Wilson hand seater.
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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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