godale
Member
just wondering with winchester super x 130 if i am sighted in at 50 yards, where would i be at 150 yards ? maybe i am missing something but at 150 i am about 6 inches high. any help would be appreciiated
another 270 question
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Bullets don't leave the muzzle parallel to the ground and then drop. Your scope is higher than the bore. The muzzle of your rifle is canted upward ever so slightly and the bullet will rise after leaving the muzzle and travel in an arc. At some point it will cross your line of sight. At some point it will reach the highest point of it's arc and begin to drop and will eventually cross the line of sight a second time.
Because you have it zeroed at such a close range the bullet is still rising at 100 yards, maybe even at 150. I'd adjust the sights so it is hitting where you're aiming at either 100 or 200 yards. With a 100 yard zero you'll be about 1" low at 50, and probably less than 1" low at 150, about 2" low at 200, and 8-9" low at 300.
With a 200 yard zero you'd still be a little low at 50, but not enough to miss, about 1.5" high at 100, dead on at 200 and 6-7" low at 300 yards.
With your 50 yard zero the bullet isn't dropping and coming back down to the line of sight again until it is close to 300 yards out.
Personally I like a 100 yard zero, but can live with 200 yard zero's. Your rifle is zeroed at 50 and about 300 yards. This means the bullet at closer ranges is enough over your point of aim to cause a miss. People will remember to hold high at longer ranges, but seldom remember to hold low at close ranges where most shots are actually taken.
Because you have it zeroed at such a close range the bullet is still rising at 100 yards, maybe even at 150. I'd adjust the sights so it is hitting where you're aiming at either 100 or 200 yards. With a 100 yard zero you'll be about 1" low at 50, and probably less than 1" low at 150, about 2" low at 200, and 8-9" low at 300.
With a 200 yard zero you'd still be a little low at 50, but not enough to miss, about 1.5" high at 100, dead on at 200 and 6-7" low at 300 yards.
With your 50 yard zero the bullet isn't dropping and coming back down to the line of sight again until it is close to 300 yards out.
Personally I like a 100 yard zero, but can live with 200 yard zero's. Your rifle is zeroed at 50 and about 300 yards. This means the bullet at closer ranges is enough over your point of aim to cause a miss. People will remember to hold high at longer ranges, but seldom remember to hold low at close ranges where most shots are actually taken.
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godale
Member
i am using a simmons 4x14x44 aztec scope. the rifle is a stevens 200 no open sites.need to find me a 100 yard range.
Your bullet starts to drop the moment it leaves the barrel, also loosing velocity at that point too!
BSA1
member
50 yards is to close to be meaningful. The 270 shoots so flat that it will deliver minute of deer out to 200 yards without changing scope adjustment. You should be more concerned about how your rounds are grouping at 100, 150 & 200 yards.
Dain Bramage
Member
Yes, your bullet starts to accelerate downward due to gravity the moment it leaves the barrel.
What jmr is saying just replicates a ballistics table for sighting in at a set distance. Assuming a horizontal line of sight (LOS) to your target, the barrel is effectively canted upward, so the LOS and ballistic arc of your bullet will match at a given range. So, anything beyond point shooting, rifle ballistics are set up like a mini-artillery table.
Traditionally, bullet elevation starts at (canted upward) barrel elevation, crosses the LOS, rises to a peak, and then drops, crossing LOS downward. Your bullet strikes above or below the LOS depending on your sighting distance and range to the target.
If LOS and ballistic arc are not set up to converge, given their starting elevation differences, then the bullet will never hit your point of aim.
A barrel-centric point of view would have the barrel horizontal, and the LOS sloped downward. Nobody does this because then you would have to adjust the elevation of your target to hit anything. It's much easier to adjust the angle of your rifle barrel.
gamestalker
member
I zeroed one day before yesterday at 200 yds, but because the optic wasn't as close to the barrel as I would personally prefer, it wouldn't zero until about 250 yds..
To do things right, you really need at least a couple hundred yards to work with, 50 yds. won't cut it with a rifle that has a muzzle velocity of at least 3k+ fps.
GS
To do things right, you really need at least a couple hundred yards to work with, 50 yds. won't cut it with a rifle that has a muzzle velocity of at least 3k+ fps.
GS
illinoisburt
Member
Huh? How can 200 yards not be within the mechanical range of the scope adjustments but 250 yards is? Drop is only a couple inches. Maybe you have a 20 degree sloped base and maxed out the elevation turret? Not sure I understand what you are trying to convey with the 3k_fps reference either.
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