heavies in a 22-250?
04-19-2005, 02:29 PM
#11
Guest
Posts: n/a
RE: heavies in a 22-250?
Soilarch, a heavier bullet don't "buck" the wind. Only thing a heavier bullet does is give better BC. Only thing that bucks the wind is getting from point A to B fastest. I know guys shooting 22-243 middlestead that shoots those real heavy bullets but they have 1 in 8 twist and that thing chucks it out fast to take advantage of the extra BC.
04-19-2005, 08:08 PM
#12
Join Date: Mar 2005
Location: Colorado
Posts: 4,127
RE: heavies in a 22-250?
Faster bullets have less wind drift; but heavier is better when the speed is the same - or more precisely, when the time of flight to the target is the same. For instance, the 100 grain Sierra .243 spitzer and the 180 grain Sierra .308 spitzer both have a ballistic coefficient of about .460. So their time of flight to the target is the same, and the trajectory is the same out to infinity - at any velocity, so long as they have the same muzzle velocity.
But the wind drift, at 500 yards in a 10 mph crosswind, is 20.3 inches for the .243 and only 16.8 inches for the heavier .308 bullet. (both bullets going 3200 fps) This really jumped out at me when I was reading an article in the American Rifleman quite a few years back that compared the trajectory and wind drift of the .300 Weatherby and the .50 BMG. The trajectory is really close - but the BMG's 750 grain bullet has about 1/2 the wind drift at long range.
But the wind drift, at 500 yards in a 10 mph crosswind, is 20.3 inches for the .243 and only 16.8 inches for the heavier .308 bullet. (both bullets going 3200 fps) This really jumped out at me when I was reading an article in the American Rifleman quite a few years back that compared the trajectory and wind drift of the .300 Weatherby and the .50 BMG. The trajectory is really close - but the BMG's 750 grain bullet has about 1/2 the wind drift at long range.
04-20-2005, 03:16 AM
#13
Nontypical Buck
Join Date: Jun 2004
Location: A flat lander lost in the mountains of Northern,AZ
Posts: 3,171
RE: heavies in a 22-250?
Wow i never realized how much effect BC had on the TOF, its amazing to me how that works. Totally openned my eyes from this point on i wont assume because something has a higher muzzle velocity its TOF will be faster then something with a lower muzzle velocity. Makes complete sense that the TOF would play the roll of howmuch a bullet suffers from wind drift. very very cool thanks for the insight Roskoe im sure you woke up a few others on here too.
04-20-2005, 03:56 PM
#15
Join Date: Dec 2004
Location: La Grange, TX
Posts: 324
RE: heavies in a 22-250?
Although Barnes are somewhat suspect in what they proclaim as BC and what actually can be calculated by MV and downrange retained V at the target.
I"m a 100% x man though and continue to use them as the BC regardless of it being mostly somewhat inflated, is still more than enough to work well.
I"m a 100% x man though and continue to use them as the BC regardless of it being mostly somewhat inflated, is still more than enough to work well.
