Ballistics question

jimdeere

I put a Leupold vx-II on my muzzle loader. Dialed it in and it shoots 2” low at 25 yards. 295 gr. Powerbelt bulllets over 100 gr. of 777. Where will it shoot at 100 yards? It’s going to be a few days before I can set up a target at 100 to make a final adjustment.

Butchdog2

Probably in the dirt.

mogley98

Depends were you point it when you pull the trigger I believe

Actually I have no idea but I bet you could plug that into one of those nifty ballistics calculators?

BobJudy

I would think you would be pretty close but part of it depends on how high your scope is mounted above the bore. Bob

bpost

It depends on your bore center to horizontal cross hair distance.  The distance between them has a HUGE impact upon, well bullet impact, at close and long range.  The bullet is rising to hit any target past the muzzle.  It crosses the line of sight twice, depending on distance.  Once at XX yardage on the way up then again at XX yardage on the way down.  Gravity acts independent of forward motion.  If you are on at 25 yards you will at least hit paper at 100 in normal shooting.

likemhot

Exactly what BPost said

Stolen from a ML sight hope this helps. If you are 2" low now you may be in the dirt at 100

You will need to fire a 3 shot group. You will want to use the grid paper that is available at most gun shops as your target. The grid paper provides a quick frame of reference to the difference in your point of aim and point of impact. Generally each grid is 1”x1”, giving you an easy way to see how far off your point of aim and point of impact are. To adjust it from there, keep in mind that the turrets usually adjust in increments of ¼ of a Minute of Angle (MOA). In practical terms, that means each click is approximately .25” at 100 yards (not exactly but close enough for your use). This is because 1 MOA is equal to 1.047” at 100 yards, which is usually simplified to 1” by the average shooter. So at 50 yards 1 MOA will be .5” and at 25 yards it will be about .25”.

Shoot your first group, then by looking at the grid paper, calculate how far your windage and elevation turrets are off. If you are shooting at 25 yards, you will have to multiply the amount you are off by 4 to figure out how many minutes of angle it would be off at 100 yards. Likewise, if you are at 50 yards, you will have to multiply the number you are off by 2. You will then take the number you found and calculate how many clicks you will have to move the turrets. For example, if your windage is off 1 inch at 25 yards, you would have to multiply it by 4 since most scopes adjust for .25 MOA or .25” at 100 yards, and then divide the number you calculated by .25 (or multiply it by 4 again, you will end up with the same numbers either way) as each click is .25” at 100 yards. So you would end up needing to adjust the turret 16 clicks to get it where it needs to be if the scope is off 1” at 25 yards, or in your case 32 clicks to be on the paper, factor in your elevation as bpost stated and you may need another 16-32 clicks, Once you do, you will be sighted in and ready to shoot!

BobJudy

Jim just for our education will you post your 100 yard results  when you get around to finishing your sight in? inquiring minds want to know. Most charts show a rise of about 2 inches from 25 to 100 yards. Bob

dcon12

jimdeere said:

 Where will it shoot at 100 yards?

Where you gonna be? Don

Don McManus

You will need to know the muzzle velocity and the velocity at 100 yards. For this case assume average velocity is the average those two numbers. If your scope is 2” above the bore line, assume it is aligned with the bore.

Time is velocity divided be distance, so now you know the time of flight.

Multiple the square of the time by 16, and this is the amount of bullet drop over 100 yards. Set you crosshairs at that distance above current setting at 100 yards, and you should be close enough to dial in.