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!
Here’s a term you’ve likely heard thrown around a lot, lately: Barrel Life. We’re going to discuss what barrel life really means and how it works since it’s been coming up in articles lately. I want to make sure everyone has a good grasp of exactly what barrel life is. I want to make sure people understand what factors affect barrel life. Lastly I’d like to give some rules of thumb for lifespans of different calibers and what a person can reasonably expect for barrel life in those calibers.
Occasionally we go over a topic here that we get repeated and continued interest in, like the 6.5 Creedmoor Vs 308 Winchester debate. We discussed this a bit in an article on the 6.5 Creedmoor as a good caliber for beginners. Now, due to continued interest in the 6.5 Creedmoor Vs 308 Winchester debate, we’re going to delve a little deeper into the ballistics side of this argument. I also plan to illustrate factory ammo price differences and availability. We’re probably even going to do a cost projection over the usable service life of the barrels and hopefully end the 6.5 Creedmoor Vs 308 Winchester debate, once and for all.
Truing your ballistic data is something everybody should be doing regardless of skill or experience level. The practice of truing your ballistic data is a fundamental necessity if you want to have accurate adjustments and drop charts for long distance shooting. What we are talking about is taking the data that is output by a ballistic solver or computer and tweaking it to match what we see in real life. You should never just generate a drop chart and assume it will be correct. There are too many variables in play here. You need to generate a drop chart and then check its accuracy with live fire. Then you need to adjust the chart to match what you are seeing in the real world.
In this post we are going to discuss a little about ballistics and cartridge performance. Specifically if you are planning to purchase a rifle or have one built, what kind of ballistics and cartridge performance can you expect given the different variables that influence those two factors. Things like barrel length, caliber, and the ammunition used can all influence the ballistics and cartridge performance of a particular rifle. If you put some thought and planning into what features are the most important you can better plan your purchase or build so that it gives you what you want and performs to your expectations.