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  1. B

    Does rain reduce computed drop?

    Shooting last Sunday. Conditions: rain visible in scope - moderate rate; 49 F ; 68 % RH; 28.24 inHg absolute. Bullet: Hornady, .308 230 gr A-Tip, 2700 FPS, barrel 1:9, scope height 2 inches. The rain was not falling straight down, I needed about 0.4 right most of the time - range 0.2 to 0.8...
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    Runout in size die body - Does it matter? Probably not...

    Thinking out loud ... you said, "After alignment, concentricity of the exterior body was found to be perfect from top to bottom - but the interior showed 0.002" runout." Your friend aligned the outside of the die. Since the runout was zero, we can conclude that the die body was round and that...
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    How is RCBS in business?

    Back when dinosaurs roamed the earth I went to work at a company with an IBM System 3 Model 15D - this was a long time ago, you could see the marks where Fred and Barney has chiseled the gears. The IBM systems guy tells me this story. The machine was installed and it started out flakey, they...
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    What makes a bullet accurate?

    "What makes a bullet accurate?" Accuracy is: when you aim exactly at X, all your bullets land in exactly the same place, relative to X. What can go wrong? A bullet moves through air so there are aerodynamic forces. Drag slows the bullet, drag force changes with velocity. If that air is...
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    What makes a bullet accurate?

    Where did your bullet design come from? Bryan Litz (and many others) wrote about bullet design including elements like center of gravity. Since you aren't using jacketed lead bullets you probably can't use a lead bullet shape. If I recall correctly the shape of the nose and boat tail...
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    Neck Tension

    This is too long. Oh well. I use Redding or Wilson full length dies with a button. For 308 and 300 PRC, the button leaves the neck ID at about .303. I mandrel up to .305. The bullets are .308. After seating the bullets, the neck ID is the same as the bullet. After reading this thread, I...
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    300prc vs 300norma improved

    Given Hornady a-tips and a 10 mph full-value wind, Applied Ballistics says: 3150 fps gives a flight time of 3.113 seconds, 2.5 mils of wind, and a terminal velocity of 1181 fps. 3050 fps gives a flight time of 3.249 seconds, 2.7 mils of wind, and a terminal velocity of 1123 fps. + 136...
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    300 PRC Die Question

    21st century. I get .305 +- .001 usually better than ,001.
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    Solid rest recommendations

    With a good rear bag, a decent bipod, and good fundamentals, you should be able to make accurate shots. I shoot threes (okay, big threes) shooting prone while using a Harris bipod, rear bag, and a 300 PRC (it has some recoil). If you are going for groups smaller than that, a front rest may be...
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    Reloading for multiple rifles of same cartridge

    Given the social applications of a 12-inch AR-ish weapon, you want that one to go BANG and cycle EVERY time without fail. So thinking about the 6.5 Grendel, seems to me that getting ammo to function in the 12-inch gun will be harder than the other two barrel lengths. So load to the most picky...
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    Storage of loose match ammo

    I load 223 with 77 grain bullets. I put 223 in strippers then into cardboards then into bandoliers. I can get 1,200 into a fat 50. Its a tight fit. If I put 100 rounds of 223 into a quart ziplock bags, I can maybe 1,500 into a fat 50. Its good exercise moving those around. I store 308 and...
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    Another chambering issue

    Thoughts ... :) So far you don't know which reloading step is causing the issue. Do the following chamber checks with a stripped bolt - that is, remove shroud/firing pin assembly and ejector pin. Can you reliably chamber ... 1. ... a piece of brass fired in your weapon? - if yes, you have...
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    What’s the science behind loose primer pockets?

    Thanks for the images. I hijacked one of them and I will use it to explain my question. okay, the firing pin just ignited the primer, the powder is now in the form of a gas, it is very hot so the pressure is high. The gas atoms are pushing against the walls of the brass. For engineering...
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    What’s the science behind loose primer pockets?

    I don't understand the dynamics here. I accept that the barrel/chamber gets larger from pressure and that the brass is transmitting the pressure from the inside of the case to the steel. The powder makes 50k PSI, forces the brass against the chamber walls, the steel deforms elastically and the...
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    300 PRC Die Question

    Consider doing sizing on a Dillon. I have a 550B. In the past, I set up a toolhead with a full length 308 button die and a mandrel. I could full-length size and deprime, re-prime and mandrel for each pull of the handle. With proper lube, precision was adequate. About the mandrel: the full...
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    300 PRC Die Question

    I use the Wilson full length die with button to ID .303, mandrel to ID .305, and seat with Wilson seater. I anneal every time so neck tension is very consistent.
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    Rifle Scopes Optic Failures

    Leupold 36x - had two of them, each worked for about 18 months then had to be sent in. Turnaround under a month, came back as good as new, very good service. Kahles 6x24, used, bought from the Hide, illumination didn't work. Sent in, fixed. Took about 2 months. Kahles 5x25, used, bought from...
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    Someone please tell me how this is even possible.

    Seems to me I read about different ways or aspects that a bullet could follow as it went down range. Perfect is when the bullet is spinning around the long axis of the bullet and that log axis exactly matches the computed ballistic curve - minimum drag, easy-to-compute flight path. When...
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    Mistakes when reloading

    While loading 300 win mag and 220 grain SMKs using a balance beam scale, I put in 10 grains too much powder. I think it was 82 grains of H1000 instead of 72 grains - compressed charge. Solution: buy a decent digital scale with calibration weights. This was about 30 years ago. I still have...
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    Expanding Dies / Mandrells

    I use the 21st Century 0.306 mandrel in their floating mandrel holder thingy. I anneal after every firing. Full length size with a Redding type-S so that neck ID is about 0.303. Using graphite for lube, run each case over the 0.306 mandrel and I get 0.305 neck ID. A 0.306 gauge pin won't...
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