good in wind

[hjl]

Hi to all as this is my second post.
I have a rem 700 in 7mm stw.When I wear the barrel out I want to try a different calibre.
I am looking for something that will give me less than 9 inchs of wind drift in a 10 mph wind at 500 yards.
What suggestions have you guys got?
I would prefer the rifle to weigh 12 pound or less & not kick too much.

Regards
hjl

 

[jmden]

What elevation are shooting at? What caliber(s) are you considering?

Most of the heavier bullets pushed fast in each caliber from long barrels will do this, but will be more likely to do it at elevations well above sea level. Add a brake to reduce felt recoil in the big overbore chamberings.

jmden

 

[Varmint Hunter]

Working with your current 7STW - Shooting the 162gr A-Max @ 3,200 ft/sec you should have about 9" of windage @ 450yds in a 10mph cross wind.

Close enough?? /ubbthreads/images/graemlins/wink.gif

 

[hjl]

thanks for your reply. the area I shoot in is appox. 660 ft. above sea level. The calibers I am considering are 257 stw and 7mm rum.
Regards
hjl

 

[hjl]

Dear varmit hunter,
Thank you for your reply.According to Sierra Infinity a 162 amax @ 3400 has 10.9 inchs of drift at 500 yards. I am using 162 amaxs at the moment.I have been slack & haven't chroned them yet. In my new caliber I hope to have less than 8 inchs of drift if this possible.
Regards
hjl

 

[jmden]

Hi, At 660ft. elevation and those "smaller" calibers and the chamberings you mentioned, I think that you are going to have to be going near the extreme end of long barrels and high velocities with heavy bullets, and it still may not be possible with those chamberings. Without knowing which bullets you plan on shooting (it'll have to be very high BC wildcats, I think, pushed very fast), it's difficult to do the math on the ballistics programs. There's alot of guys on this board that know much more about this than I, but I would take a look at Fiftydriver's new chamberings (do a search or two for the Allen Mags) in those calibers as a good bet...but at that elevation it may be a challenge even with those. I don't know. Good luck. I think you may have an easier time doing what you want in the .308 caliber.

 

[dakor]

I would build a custom 7mm STW and be done with it. You should be able to shoot 162 A-max's at 3300fps or 3400fps with a 28inch or more barrel. Get one with a 8 twist and you could shoot the big 200 Wildcat around 3000fps or a Berger 180 around 3200fps. The 7mm's really shine in wind drift and drop pretty tough to beat them.

 

[Michael Eichele]

178 AMAX @ 3300 FPS = 8.14" of drift in a 10MPH cross wind at 0' and 59 degrees F.

Or 3450 = 7.6" It is possible to achieve 3400-3450 with this bullet with a well put together 300 RUM using bullets coated in tungsten disulfied.

Please bear in mind before you all start replying with "thats impossible", if you have never fired a 178 AMAX at 3100-3450 FPS dont criticize this post. These are real world conclusions.

 

[Charles A]

meichele not that you need it, but I agree. /ubbthreads/images/graemlins/wink.gif

 

[zingdingo]

meichele and Charles,

Have you seen this exceptional performance with the A-Max's when their driven at lower velocities? Obviously there would be more drift than if they were going faster, but I'm wondering if it seems they exhibit some kind of threshold where they work best driven at those high speeds. I think I would be hard pressed to get them to more than 2800 in my factory '06. Just wondering if you think it would be worth my while to get a box to try out.

Thanks a lot,
Carl

 

[sewwhat89]

I am shooting them in my 300 SAUM. Well, I tried them. At 535 yards I was seeing about 6" of drift in variable winds of 5 mph. At 200 yards, they will blow a 4 sq in section of steel out of an old saw blade, at 300 yards, they still blow out a hole a little bigger than a half dollar.

I got better accuracy with the 175 SMKs.

I am shooting 178 AMAX most accurately at about 2875-2950 fps, depending on the lot of powder used. I have shot them as low as 2800 fps. I got one lucky group at 535 yards with them at that velocity, 2.2" ctc 5 shots. I have the SMKs as tight as 1.4" ctc.

Wind drift between them on the same day, same conditions, same load even, the smks had 1/3-1/5" less drift. Its negligable. The AMAX shot flatter. The wind had to have been a little gustier on the AMAXs.

I will be hunting with the SMKs loaded to 2835 fps in a couple weeks. The terminal performance should be terminal! /ubbthreads/images/graemlins/tongue.gif

 

[Michael Eichele]

Zingdingo,

I have shot the 178 AMAX at much lower velcities like around 2550 FPS and the results were no where near as dramatic. It worked out to be on the G5 function using .318 for a BC where as when I fire them at 3100 G7 and .495 seems to work pretty well.

 

[zingdingo]

Thanks for the info guys

Carl

 

[Charles A]

zingdingo, I havent shot them much out of anything but 300winmags and 300RUM, but the few out of a 308(with 168's) still produce outstanding terminal performance.