So this is the follow up from last week’s article on evaluating the ballistic performance of projectiles. Specifically, we’ve been looking at the differences between the 105gr Berger Hybrids and the 115gr DTACs. In general, the heavier the bullet the better the performance. That isn’t always the case and just because one bullet is bigger doesn’t mean it will have better ballistic performance. If the bullet has a poor design it can just be bigger and heavier without necessarily having better ballistics. Why would you want that? Well, Hunters are concerned with good terminal ballistic performance at closer ranges a lot of times. Some guys hunt long range but even still the average is probably around 650 yards. If you aren’t shooting as far, you can afford to use a bullet that’s a little less slippery as far as ballistic performance. The tradeoff being it knocks down the animal you’re hunting. For the rest of us interested in competitive and recreational shooting at longer ranges, the BC numbers tend to be pretty important. In this case it’s a difference of almost a full tenth of a point. The Bergers are currently rated at around 0.53 and the DTACs are pulling 0.62. Last time we looked at some of the numbers on paper, this time…we’ll see how the DTACs did in the real world!
Hey guys it’s your favorite viking from the Frozen Wastes again. This time I’ve loaded up my longship for another round of pillage, loot, burn….. Sorry I let my inner monologue out again. I don’t know why that keeps happening. Anyways this time I’m coming to you straight from Iowa. What can possibly be in Iowa I can hear you asking. Well it should be obvious from the image up top. I’m visiting Jard!
If you’re a regular reader on AccuracyTech you know I’ve been looking into the new 115gr DTAC bullets sold by David Tubb. I’ve been working on a ballistic performance evaluation of the new rebated boat tail DTACs for a few reasons. For starters, I have had excellent results and performance with the 105gr Berger Hybrid bullets. So why switch you might ask? The answer lies with the ballistic coefficient of the new DTACs. It’s been advertised as having a G1 value of 0.620! That puts it on par with the 6.5mm Berger 140gr Hybrid which has a G1 value of 0.624. So we’re talking about the same wind fighting ability as a 140gr bullet packed into a 115gr package. That’s pretty attractive! This article series is going to go into some of the evaluation work done before I made a decision on whether the switch would be worthwhile!
You may have seen the terms Zero Height – Zero Offset when working with a ballistics calculator but many people don’t know what that means. Put simply it’s a way of saying to the calculator that you have less than a perfect “dead center” bullseye zero on your rifle. Should that really matter? Why would it be important? How close to dead center do you really need to be in order to get good results downrange? We’re going to discuss some of these questions and a little about the terms so if it’s something you need or want to play with, you know what you’re doing! There’s a lot that goes into ballistics, the software the runs calculations, etc. and we’re all learning all the time. Myself included! So let’s dive into this!
Welcome back! We’re onto Part 3 of our Accurate Reloading By Chronograph series of articles here. In part one we discussed briefly the idea behind our reloading method. In part two we took our first trip to the range and reviewed the results. Now, in part three, we’re going to refine those results further! The idea is to really close in on what charge weight gets you the results you want with the bullet you chose. You want to get as close to your velocity goal as possible without running into pressure. In the end, accuracy is more important. If you have to drop a little velocity to avoid pressure or get a tighter result on the chronograph…do it! Now let’s get back into it!
When discussing the AccuracyTech method for accurate reloading, it helps to have a clearly defined objective. This is the process we’ve developed and have used, with success, to develop 1/2 MOA or better loads across a variety of calibers and catridges. This load development project was done over the span of …
The Badger Ordnance Cat’s Eye is an accessory that really only benefits folks using a Leupold MK4 or Gold Ring Spotting Scope. However, for those of you out there with a Leupold spotter, this thing is pretty neat! It has two functions. It decreases the aperture of lens which reduces the amount of light allowed in, and any glint allowed out. It also functions as a pretty high dollar lens cap. Is it worth the $135? Does it have any detrimental effect on the quality of the image or the ability for somebody to use the scope? We’ll answer those questions in more in today’s article!
Do barrels pick up speed? It’s a concern to many in the precision shooting sports though it isn’t talked about as widely as I’d have thought. This topic should be of particular interest to hand loaders since it could affect their load development and result in wasted powder, bullets, primers, etc. The idea here is that a brand new barrel, if chronographed with it’s first rounds out of the tube, will see a speed increase as the barrel “breaks in.” I’ve got some data to support this, both anecdotal and hard numbers. However, I did make an error when I set out to really try and confirm this in the manner I planned. Do barrels pick up speed? Read on to find out!