Recent content by bax

It says "crimped primers". Can be fixed but an extra step.

Because I like all of my measurements to agree. The more, the merrier. When I have a measurement that doesn't agree, I get nervous that the new one is right and all of the other ones are just accidently close to right. I have a lot of experience with developing theories and then using them...

The drop depends on the gravitational constant and flight time - S = 1/2AT**2. Flight time between any two points on the trip depends on initial velocity and drag. We have devices to compute that, I also carry printed trajectory tables. And we have angle measuring devices mounted on our rifles.

I get a 100 yards zero, I usually slip turrets. Then I shoot at 200 yards until I am on then I write down the scope elevation above the 100 yard zero - say +.4. Then I shoot at 300 until I am on then I write down the scope elevation above the 100 yard zero - say +1.2. Repeat until I get to...

You guys are going to a lot of trouble to tell me that my technique for estimating velocity won't work. Well, too bad. It has been working for me for about 20 years with every gun I have used it with. I haven't taken a chronograph to a range in forever and regularly I make cold bore 800 yards...

Apparently I didn't explain my "without a chrono" process - it involves shooting. 1. shoot and adjust until your have a 100 yard zero - slip or not, up to you. 2. shoot 200, adjust scope until point of aim equals point of impact. Write down your scope setting. 3. shoot 300, do like 200...

I developed a load without a chrono - I just shot for accuracy and used the elevation measurements from the scope to determine velocity. Using that technique, I figured that my velocity was about 2725 fps. Last Sunday I was out with a buddy. He had a Garmin chronograph. I placed it next to...

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.

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...

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...

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.

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...

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...

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...

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...