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Search results

  1. B

    Reloading Equipment Trade: Federal 205M for Federal 215M

    Yes, match primers, not standard 215s. I'm not really sure there is a difference but that is what I have been shooting and I want to stick with the same primer.
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    Reloading Equipment Trade: Federal 205M for Federal 215M

    I have 5,900 205M, lot number is 5BY262. These are in 6 each 1k bricks. Always kept cool, dry, and in the dark. I need 215M. I don't need one-for-one but I am not desperate. Trade only, I don't need the cash. Face to face - show me yours and I will show you mine :) I am in southwest...
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    Verifying Muzzle Velocity

    There are two primary factors determining drop: atmospheric drag on the bullet and gravity. As air density increases, bullets lose velocity faster so it takes longer to get to a given target. More time means that gravity has longer to work on the bullet and, for a given point of aim, the...
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    Condensation

    Consider 100% relative humidity at minus 20 F. When this happens in Anchorage Alaska and the wind is nearly but not quite calm, it is called ice fog and the ice collects on the trees and bushes - they look like white sausages.
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    Verifying Muzzle Velocity

    I am shooting a 300 PRC with Berger 230 grain hybrids, 26 inch barrel, estimating 2725 fps. I use the Applied Ballistics app on my phone. I select the bullet from the bullet library. I set altitude to 0 in Applied Ballistics, enter the pressure from my kestrel, and select "pressure is...
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    Fired brass same size as unfired

    Right you are, my mistake. I use Forster headspace gauges and mitutoyo caliper that measures to .0005 precision. I made some measurements: Try to measure my .308 headspace gauge using hornady .400 comparator body. Gauge is forster marked 1.630. Measurement says that my headspace gauge...
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    Fired brass same size as unfired

    According to SAAMI, headspace at the .330 mark is 1.4666 minus 7 thou. You could have a chamber that is 1.460, just on the short end of SAAMI. You still need to bump a little to insure that you can chamber a dirty round. The amount of bump is up to you but 2 thou is the common number. The...
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    Duplex rifle loads, anyone tried it?

    This is interesting to think about. I'm thinking that "burn rate" is determined by pressure, physical shape, initial state powder chemistry, and the intermediate products and specific reaction times - for example, base compound X, in the shape of a sphere with initial surface area Y, converts...
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    Curious reloading problem

    I am trying to work it out, I am not trying to be disagreeable. "The excess brass" ... where did the excess come from? Why is it "excess"? I'm thinking about the standard model that I think we all share: firing pin pushes cartridge shoulder against the chamber, primer fires, brass neck...
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    Curious reloading problem

    If pressure doesn't cause additional case length, where to donuts come from?
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    Training scars... let's hear 'em

    "training scars" I have square-range habits that, if repeated under stress, may get me killed. Like picking up my brass. Like moving or leaving my weapon with scope caps open. Shooting strings of mag capacity - 5 and 10 instead of 3 and 7. Like shooting a string then dropping the empty mag...
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    230 berger defects?

    For those of you who haven't thought about how bullets are made, here is a short bit. You start with a jacket shaped like a straight-sided drinking glass. The jacket sides taper, thicker at the bottom, thinner at the top. Step 1: seat a lead core into the jacket. The punch is sized so that...
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    Do you use expanding mandrels after a full-length bushing die for neck sizing?

    Talking range brass here -- suppose you have 100 each federal, Lake City, IMI, and PMC range brass, load them all, throw them all into a pile, and shoot three groups. Now suppose you sort and load but keep the headstamps together. Shoot a group of Lake City and a group of PMC. Everything...
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    Do you use expanding mandrels after a full-length bushing die for neck sizing?

    Agreed. Assuming a pile of range brass, you can anneal all of the cases. Assuming that you use a mandrel, that will address the "number of firings" issue, neck IDs will come our more or less similar. But there are other differences between brass brands. Fixing the neck ID does not obscure...
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    Do you use expanding mandrels after a full-length bushing die for neck sizing?

    re: full length and/or bushing versus mandrel When you fire and size, brass migrates toward the shoulder and neck. When you full length - bushing or not - that donut is formed on the inside at the base of the neck. If you use a mandrel, the neck inside diameter becomes more cylindrical and...
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    Realistic expectations?

    I just noticed that you are shooting 3-shot groups. I feel a bit stupid for just noticing and not reading that in your original post but whatever. You should go to a benchrest match and look at the wailing wall. Remember, those are mostly 5-shot matches - unlimited matches are 10-shots...
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    Realistic expectations?

    Let's check assumptions. These are results from the 2023 Pennsylvania state IBS match, 100 yard heavy varmint. 100 yards, 13.5 pound guns. I included Bob White because I remember that name from the past - waaayyy past. Look at the match results for the winner - three of them are in the...
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    Lapua .223 Brass Broke in Half

    For what it's worth ... Suppose the shoulder is annealed before sizing (as opposed to only annealing the neck). If you take a headspace measurement following sizing, the measurements have a smaller range. With annealed shoulders, the range is usually plus or minus one thou - so, if the...
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    300 PRC rifling marks

    You are right about jam, that was a careless use of words. I am really curious why he is seeing three long marks and two short marks. I have other thoughts but I will listen while you guys hash it out.
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    300 PRC rifling marks

    oh yeah, the 'OTHER' 0.015 - thanks for clarifying :)