Re: 220 Swift for 90 gr VLD's.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KYS338</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Gunny81</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JJones75</div><div class="ubbcode-body">
I agree with chad though about going with a 6mm instead , a 243 Ackley shooting a 105gr Berger Hybrid at 3200+fps would shoot super flat and not be nearly as hard on the barrel </div></div>
I'm already shooting a 243 ackley with a 115 dtac at 3200ish. I just don't have a 22 caliber rifle. when I choose a caliber, I like to investigate all the possibilities and try n find the most ballistically superior projectile and cartridge. In .22, I want to shoot the 90 grain vld, 6mm the DTAC, I hate 25 cal, in 6.5 it's the 142 smk, 7mags the 180vld or 195 when it comes, 30 cal is the 210 vld, 338 is the 300 vld or smk. It's kinda funny how 3000fps seems to be the magic number for all of these. </div></div>
If you are wanting to shoot ballistically superior bullets in the calibers you listed... you are not choosing the correct bullets IMO.
6mm - The 105gr Berger Hybrid, pointed and BN coated smokes the 115 DTAC. Flatter shooting and cuts the wind better.
6.5mm - again, the 140gr Berger Hybrid pointed and coated smokes about everything else out there. 2900 is easy, as well as the hits @ 1k.
7mm - same thing, the Berger 180gr Hybrid, pointed and coated just hammers out to 1400y for me.
The pointing process really changes the overall BC by 10%. That is huge and the fact that the 115 DTAC comes pointed and the Berger still crushes it is insane. </div></div>
The bullets listed aren't the exact ones I use. Just an approximate weight. I tend to choose whichever will shoot best from my rifles at speeds that achieve the most accuracy. I don't always run 3000fps. I can't with a 300 in my lapua. But just to see I did the LMI. Bullets that are higher than .530 or so tend to act a little differently when speed is added than say a bullet with a bc of .612 or higher. Speed is sometimes detrimental to accuracy when the harmonics are thrown out of whack because of it. That all goes back to barrel stiffness, too fast of a twist for certain speeds and so on. I've only shot to a mile with my better 7's and the 338's. Those are the only ones I trust to get there consistently. When I do go for that god awful distance, I use the 180 hybrid and 168vld in my 7's. In the 338's I use the 300smk, 300 berger hybrid, and the hornady 285. To me there's no difference in the 3 because I'm achieving similar velocities and getting the same results with all three. I can't do any better than 10 inches or so 5 shot group at a mile anyway so I don't do it much. Back to the task on hand. I've done some more reading from the guys who shoot similar guns in oklahoma at prairie rats. They're pushing the 90gr out of an 8 twist at about 3k and achieving reasonable pressure, extreme accuracy, and great barrel life from a regular 22-250 throated for the 90. It looks like y'all have all been an extreme help though. Lots of great knowledge that all of y'all are helping with. That's why I love this site. Between all of the guys here, there's an extreme wealth of knowledge and a guy can juggle some ideas in his head and help make a reasonable decision. Thanks again guys..