7mm stw

[jagilks]

My first post joined a while back but never got around to posting, hello to all. I am in the process of having a 7mm stw build and am looking at using 150g swift scirrocco 11 bullets. have done some ballistic calculations and from what I have found may have .25-.4 MOA windage at 1000 yards but 25+ MOA less drop. I am looking for any and all opnions as I am new to this game and appreciate all the advice and recipes any one may put forward. Thanks in advance Jim.

 

[squirrelduster]

With all that horsepower stick with the bigger bullets. I don't have a STW but if I did I would be looking hard at the Berger 180 gr. BC of .659 would be hard to beat.

I suspect the Scirroco will be a grenade when it hits. Might be driving them too fast depending on your twist also.

 

[jagilks]

twist is 1-8.5 out of a kreiger #16 palma barrel finished at 30' before break. doing some calculations will have same velocity at 1000 yards but around 50-80 fps less with .25-.4 MOA more windage. I have been using the scirocco 11's in several 7's for many years and knw they do their part if I do mine. I couple friends are getting 3400-3500 fps with same set up.

 

[WildRose]

My first post joined a while back but never got around to posting, hello to all. I am in the process of having a 7mm stw build and am looking at using 150g swift scirrocco 11 bullets. have done some ballistic calculations and from what I have found may have .25-.4 MOA windage at 1000 yards but 25+ MOA less drop. I am looking for any and all opnions as I am new to this game and appreciate all the advice and recipes any one may put forward. Thanks in advance Jim.

Welcome and welcome to the STW club. We even have a 7mm STW subforum here.

I like the Siroccos a lot and shoot them extensively. The one thing I'd caution you on is that at these velocities they are rather explosive at sub 300yds ranges. When I say explosive I mean hitting a coyote center mass broadside with them consistently cuts them literally in half.

At longer ranges they perform flawlessly with consistent controlled expansion.

I haven't shot anything bigger than deer with them but those deer I did shoot we had perfect performance on.

With the 30 cal 180's I killed one huge old boar with a high shoulder shot and got a complete pass through with the bullet not quite making it out buried up in the cartilage sheild on the off shoulder which was about 3" thick.

I have shot dozens of large boars with the Hornady interlock and interbond and most of the time they did exit even on the same shot just as a comparison for you. The wound tracks tough internally were very similar.

 

[WildRose]

With all that horsepower stick with the bigger bullets. I don't have a STW but if I did I would be looking hard at the Berger 180 gr. BC of .659 would be hard to beat.

I suspect the Scirroco will be a grenade when it hits. Might be driving them too fast depending on your twist also.

They above is why I have literally been begging Swift to develop a 175-185gr .284. Lat time I talked to them in 2012 it was still a possibility but not under development.

 

[squirrelduster]

Seems the majority of the time I have my long range set up the critters show up at a hundred yards.
My brother was shooting Scirroco's in his 300 win mag and a hog showed up at 125 yards and he killed it in dramatic fashion. He was using the 150 gr bullets. Damage like shooting a squirrel with my 6br. Blew a huge hole.
Like Wild Rose says they do great at longer range when the velocity drops a bit. Also very accurate.

 

[WildRose]

Seems the majority of the time I have my long range set up the critters show up at a hundred yards.
My brother was shooting Scirroco's in his 300 win mag and a hog showed up at 125 yards and he killed it in dramatic fashion. He was using the 150 gr bullets. Damage like shooting a squirrel with my 6br. Blew a huge hole.
Like Wild Rose says they do great at longer range when the velocity drops a bit. Also very accurate.

Sounds like my coyotes. I've "parted out" over a hundred of them this way LOL.

 

[jagilks]

I also use te 180g in a 300 wby, 7mm wsm, 7x57A.I. and they work well taken a couple record book black bear on Vancouver Island as well as white tail and mulies and have not had massive damage unless you hit big bone.

 

[WildRose]

I also use te 180g in a 300 wby, 7mm wsm, 7x57A.I. and they work well taken a couple record book black bear on Vancouver Island as well as white tail and mulies and have not had massive damage unless you hit big bone.

You peaked my interest. Which bullet are you talking about? Sirocco? What ranges?

 

[jagilks]

sirocco 11 at ranges form 75 yards to 465 so far.

 

[WildRose]

sirocco 11 at ranges form 75 yards to 465 so far.

Interesting.

They did well for me from the .260 even at under 100yds on deer in an interesting way. The recovered bullets seemed to still be in tact but were virtually flattened and the diameter of a quarter give/take.

Big hog at long range, excellent.

Bobcat with the 300 Rum 180's at just under 1,100, perfect.

Deer excellent for me from 300-1030 with complete pass throughs and great expansion but no explosion.

Coyotes under 300 yards with the STW erupted, the 300 Rum not so much.

Thanks though it's good to swap info with someone else who's shot them enough to evaluate.