Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
Kenneth newell, Jaredmoore17, Scott Mark, Nate Oster, Trintiy Rock
64061 Registered Users
Top Posters
dogcatcher 89110
stxranchman 53365
bill oxner 48482
RKHarm24 44577
rifleman 44397
BOBO the Clown 43849
BMD 40968
SnakeWrangler 38120
Big Orn 37484
txshntr 35338
facebook
Forum Stats
64061 Members
45 Forums
421526 Topics
6106398 Posts

Max Online: 16728 @ 03/25/12 08:51 AM
Topic Options
#7200979 - 06/18/18 10:38 AM Barrel rifling questions
Bullfrog Offline
THF Celebrity

Registered: 01/21/11
Posts: 11545
Loc: N-Bedford
This is going to sound dumb but does a bullet follow the rifling all the way out of the barrel or does it ever skip any grooves, assuming all things are in new condition? Once it has pressure behind it, and once it engages the rifling, does it remain engaged?

Also, does rotation direction ever matter in relation to where in the world you are? Like a toilet that rotates one way or the other, in relation to the earth's magnetic pull? I would imagine this does affect you long range guys in some way or another.

Just sitting here on Monday morning, thinking and NOT wanting to work so I figured I'd ask some seemingly stupid questions nidea

Top
#7200987 - 06/18/18 10:44 AM Re: Barrel rifling questions [Re: Bullfrog]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 23492
Loc: Texas
No, No and No.
_________________________
Guidelines / Rules of Conduct
http://www.texashuntingforum.com/rules.htm

RULES for using the TRADING POST
http://texashuntingforum.com/forum/ubbth..._PO#Post6605808

Top
#7200988 - 06/18/18 10:47 AM Re: Barrel rifling questions [Re: Bullfrog]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 13551
Loc: Lewisville, TX
does a bullet follow the rifling all the way out of the barrel- Yes. (see picture below). Here's a picture of a fired bullet that shows the grooves from the rifling. The bullet will grip the barrel all the way down. For example, in a .308 barrel, the rifling is .300" and the grooves are .308". The bullet fired is .308" in diameter, so the bullet grips on the .300" rifling for the spin.

rotational direction in the world would be the Coriolis effect. You can read about it online, also. Yes, it will have an effect on the actual bullet trajectory the further away you shoot, and which direction you are shooting. There is also spin drift, which is the pull or drift of the bullet due to it spinning. Yes, you have to account for this also, but it's a small amount, often lost in the amount of wind drift. Inside of 1000 yards, I do not account for spin drift.

Rifling picture:
_________________________

Custom and Precision Ammunition!!
www.DallasReloads.com
Type 01 and Type 06 FFL

Top
#7201006 - 06/18/18 11:01 AM Re: Barrel rifling questions [Re: Bullfrog]
Bullfrog Offline
THF Celebrity

Registered: 01/21/11
Posts: 11545
Loc: N-Bedford
Very interesting. Thanks Chad!

Top
#7201060 - 06/18/18 11:44 AM Re: Barrel rifling questions [Re: Bullfrog]
DStroud Online   content
Pro Tracker

Registered: 11/02/11
Posts: 1825
Loc: In the Right lane
Take say a 308 and run the data with no wind and no spin drift at 1000 yds and it will say zero correction needed BUT then turn on spin drift and see the difference.
_________________________
"Anyone taking up handloading necessarily plays with unknown factors and takes chances. But so does anyone who drives a car,goes to a cocktail party,eats in a restaurant,or gets married."

Jack O'Connor 1963

Top
#7201078 - 06/18/18 12:02 PM Re: Barrel rifling questions [Re: Bullfrog]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 26082
Loc: Wolfe City, TX
When coriolis is concerned, the calculator needs to know azimuth. What direction, in degrees, on the compass are you shooting. If you are pointing at 90° (east) the target bacame closer during flight. At 270° (west) your target became farther away during flight. North and south you get a left right movement. Even at a mile shot, I have not worried about it.

There was a long discussion on Sniper's Hide years ago, Brian Litz even got involved. Yes is exists, most of the time it can be disabled in the calculator because wind is a bigger concern.



I see spin drift effects on my range, each month.
_________________________

800 Yard Steel Range
Precision Rifle Instruction
Memberships and Classes Available

Top
#7201160 - 06/18/18 01:33 PM Re: Barrel rifling questions [Re: Bullfrog]
Bullfrog Offline
THF Celebrity

Registered: 01/21/11
Posts: 11545
Loc: N-Bedford
So basically, worry about bullet drop and wind drift with my short little chip shots. Got it.

Top
#7201180 - 06/18/18 01:44 PM Re: Barrel rifling questions [Re: Bullfrog]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 26082
Loc: Wolfe City, TX
Yup, thats it.

Up/ down
Left/ right
_________________________

800 Yard Steel Range
Precision Rifle Instruction
Memberships and Classes Available

Top
#7201751 - 06/19/18 04:29 AM Re: Barrel rifling questions [Re: Bullfrog]
pigplinker Offline
Veteran Tracker

Registered: 08/07/11
Posts: 2033
Loc: Ben Wheeler,Tx
I'ma learnin sumptin here. popcorn

Top



© 2004-2018 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide