Home Forums Hunting & Shooting Ask The Gunwriters Swift sirocco II bc’s??

Seem a little inflated, how accurate are they? Thanks

They're probably little inflated, depending on how you want to look at it. Most hunting bullet companies list one, simple G1 BC, often derived from chronographing over short range. This tends to over-estimate long-range G1 BC, because at high velocity spitzer bullets tend to have higher BC's.

I generally use Bryan Litz's book BALLISTIC PERFORMANCE OF RIFLE BULLETS for calculating trajectories. The listed BC's are derived both from test-shooting and some calcuations, and show variations within different velocity ranges. My range results are always very close when using the book's numbers, and here are how a couple of Swift Sciroccos compare to his BC's:

130 6.5mm:
Swift: G1 BC .571
Litz: G1 BC above 3000 fps .551; G7 BC .251

180 30:
Swift: G1 BC .520
Litz: G1 BC above 3000 fps .483; G7 BC .246

Thanks John

Tried them in my .223 couple years back. Never could get the accuracy I wanted. My Hawk Hill barreled Montana, and it shoots everything good.
It was on the advice of scooter so go [bleep] figure....

I never had any accuracy luck with Sirocco’s in my 300 mags. I tried unsuccessfully with two different rigs. Considered them a non-starter after that. YMMV now....😎

Yep, I have no need/desire to try any more when I can get great accuracy and similar performance from accubonds.

In testing in my 300RUM (Sendero SFII) the Swift Scirroco II's shoot neck and neck with Accubonds of the same weight and accuracy is very close. In my 25-06 (700 Classic) the Scirrocos edge out the Accubonds by a good margin.

The Scirroco is significantly less in price than the prima dona Nosler too

They were spot on when i shot them out to 950 yds.

They coulc be, depending on elevation, temperature, etc.

I've only shot the 100gn In one of my .257 Roberts. They aren't the most accurate bullet in that rifle shooting into about 1 1/4 inches but accurate enough to go hunting deer and pigs. That rifle has a short throat and I sat the bullets off 30 thou. I have another Roberts with a long throat so plan to load them in this rifle and seat them about 50 thou off the lands. I think I remember reading somewhere (here perhaps ?) that they like to be seated further off the lands like the solid copper bullets, possibly because of their thick jackets.

However, their performance on game is very good. I shot one through a feral billy goat at a quartering on angle and it exited the goat's left flank after penetrating about two feet. He collapsed there and then. I shot a fallow buck through one shoulder bone right at 20 meters and the bullet stopped under the skin on the off side. It weighed 79.0 gn (79%) and formed a nice mushroom. I thought that was pretty good performance at close range and penetrating bone.

Over here the .25 cal 100gn is currently selling at AU$135.00 / 100 which is dearer than the .25 cal 110gn Accubond. But I guess good things cost money.

I've used the 180 gr.S-2 in my 300 Win. I worked up to 75 grains of H-4831 Bullet seating: I had to seat the Swift deeper than I run the Nosler A/B for good accuracy.
I have a buddy, he really likes this bullet in his Rem. KS 300 Wby. Well, he has killed a few deer and elk with it.

Not sure if they're inflated or not. If I was shooting 1000 yds I might care but for the hunting I do, which is done under 400 yds, I don't think about it. I use the 210gr Scirocco in my 338-06AI. Accuracy is just fine and as for on game performance they are unbeatable. I have three recovered from elk. All weighed around 194gr. Perfect little mushrooms.

I agree how they perform on meat, pondering running 75’s in the 22cm

If it were easier to post a pic I would do so of the recovered bullets. Oh well.

I’ve got a decent load using the 75 grains Swift’s at 3300 in my 1-8 22-250. They were the hardest bullet to get to come around but once they did they shoot real well. I use the 210’s in my 338 Win Mag, 100’s in my 25-06 and my little brother uses the 150’s in his 280 Ackley. Start them at .050 off and see what they do, once you find where they wanna be they are pretty wicked. Not a better hunting bullet made for me than them.



Wide frontal area, penetration is great and they’re accurate...

Seat em deeper if .050 doesn’t work?

I wouldn't hesitate to seat them deeper than 0.05 off if you can't get them to shoot. Not everyone seems to like them, but we've seen the SIIs perform very well on elk.

These are 0.10 off. Range is 300 yards, they are the 150-grain 7mm version.

Yes, for sure, I wasn't super clear. I start them at .050 off and keep going back in .025" increments. The 338 shot great at .050, the 25-06 liked .125" off. I don't goof around with smaller increments until I have a load that looks consistent, I am at the speed I wanna be at and they have shot the same a few times outta the gate. The 22-250 was the worst of the bunch for finickiness, but the others have come around really quick.

I got the 75 gr. SSII to shoot pretty well in my light weight .22-204, 8 twist, Brux/M-7 Rem, Jewell trigger.

They do like to jump, not the easiest to get shooting tight groups, but great terminal performance. To me, they are worth the trouble getting them tuned for optimal performance. My go-to load for hogs and varmints.

Lone Wolf stock. Not that pretty, but light and functional. Leupold CDS set up for this load. Tracks well to 400 yds.

My truck gun.

DF