6mm BR
- Thread starter eliteboris
- Start date
- Location
- Ft. Mac. Alberta
The last time this rifle was shot in competition, it apparantly went 17 rounds under 2" at 600 meters.Levi Garrett said:
Ed Begg was the builder. With the scope that is on it I can run from 400 to 1,000 m with using just the MP8 reticle, no turreting.....
Cat
Dunno, but the coriolis effect is of concern for battleship guns.. 
http://www.horusvision.com/hv.cfm?pg=ballistics#jump4
http://www.fas.org/man/dod-101/navy/docs/es310/ballstic/Ballstic.htm
http://www.horusvision.com/hv.cfm?pg=ballistics#jump4
http://www.fas.org/man/dod-101/navy/docs/es310/ballstic/Ballstic.htm
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
Accuracy of the 6BR: equal to any competitive BR set up now being used. Translations - UNDER 1/2MOA at 1000m. LR BR is now getting enough 3" to 6" groups shot under match conditions that it is the norm.
Trade off: Wind drift for reduced recoil. For shorter distances like 600m or light rifle classes, I doubt there is much point in going to a larger cal especially if new bullets continue to come out.
Limitations: for single shot varminting and max 90gr bullets, NONE. For match LR shooting and newer 115gr and heavier bullets, case too small!
Now, if you need to run from a mag to complete your task, then the cartridge choice is limited by that fact.
Corialis effect does not matter even at 1000m. The wind and ambient conditions play a much larger role. At longer distances, the mechanical accuracy of the shooter/rifle/bullet is poorer then what the earth might do in a few seconds of bullet flight so again, I doubt that matters.
I know there are several systems that attempt to compensate for perceived changes but then they want to take into account everything under the sun - literally.
Does it matter? If you could shoot to the inch at 1000m, SURE. Realistically, the velocity variations from rd to rd which translates to shot dispersion has a greater effect. Let alone the inaccuracy inherent in the subtension of the reticle.
As techies, we try and eliminate all variables and use enormous resources to do so. Even though most of the data is erroneous or irrelevant. However, the things we can't control have a much larger effect then any change in barometric pressure over a 2000 ft elevation change will ever have.
Like a switching updraft from the clump of trees you are shooting over....700m out!
Jerry
Trade off: Wind drift for reduced recoil. For shorter distances like 600m or light rifle classes, I doubt there is much point in going to a larger cal especially if new bullets continue to come out.
Limitations: for single shot varminting and max 90gr bullets, NONE. For match LR shooting and newer 115gr and heavier bullets, case too small!
Now, if you need to run from a mag to complete your task, then the cartridge choice is limited by that fact.
Corialis effect does not matter even at 1000m. The wind and ambient conditions play a much larger role. At longer distances, the mechanical accuracy of the shooter/rifle/bullet is poorer then what the earth might do in a few seconds of bullet flight so again, I doubt that matters.
I know there are several systems that attempt to compensate for perceived changes but then they want to take into account everything under the sun - literally.
Does it matter? If you could shoot to the inch at 1000m, SURE. Realistically, the velocity variations from rd to rd which translates to shot dispersion has a greater effect. Let alone the inaccuracy inherent in the subtension of the reticle.
As techies, we try and eliminate all variables and use enormous resources to do so. Even though most of the data is erroneous or irrelevant. However, the things we can't control have a much larger effect then any change in barometric pressure over a 2000 ft elevation change will ever have.
Like a switching updraft from the clump of trees you are shooting over....700m out!
Jerry
hotshot said:
Crap, that's gonna be an absolute scorcher!
I was thing about a vartarg (20-221) myself, to compliment my 204 ruger. I think a 20AI Hornet would be a cool project too - AFAIK no one's ever done that before.
But a 20 cal isn't what jumps to my mind when I think long distance shooting, 500yds being about the maximum I'd ever use it.
Still the 40gr bullets have a BC around .270 or so, that's ballistically similar to launching a 60gr .224 or a 65gr 6mm at 4k fps!
