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!
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!