Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 15, 2019 12:59:43 GMT -5
Ok, I was having a tough time with my .30-06, and didn`t understand why for the longest time. When I`d pull the rifle up and look through the scope, I was having a hard time getting a good sight picture. I really struggled to have a good view of the target, and finally figured out what the issue is. I don`t remember who I had mount this scope, but the scope is too far forward, and needs to be moved back to give the proper eye relief. My muzzleloader pulls up and I have a great view through the scope instantly, and that scope sits back well farther than the scope on the .30-06. So then, I`ll have the scope moved back where it ought to be, and tightened back down and then bore-sighted, but then obviously, that means I`ll need to re-zero the scope. Sigh.
Where do you all sight in centerfire rifles? I don`t know of any range that allows centerfires, and no range that even has the ability to provide a 200 yard range. Do you just sight in say, an inch to an inch and half high at 100, then use a ballistics table to calculate your bullet impact at other down range distances?
|
|
|
Post by esshup on Dec 15, 2019 14:03:38 GMT -5
It depends on which gun and where I'm hunting, i.e. depending on how far I will be shooting.
I typically sight in at either 100 or 200 yds, but one gun is sighted in dead on at 300. While ballistic drop tables are usually good enough to get you close, you *have to* know your muzzle velocity. What is on the box isn't necessarily what your gun shoots.
It all depends on how accurate you want to be, if you are looking for 2 moa out to 300 yds, sighting in at 100 and using the drop table should be plenty close enough.
How long is the barrel on your gun, what bullet/load are you shooting and what distance do you plan on shooting? I have a few ballistic programs on the computer and knowing that information I can get you close. Any idea what the elevation is where you will be shooting?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 15, 2019 14:40:59 GMT -5
It depends on which gun and where I'm hunting, i.e. depending on how far I will be shooting. I typically sight in at either 100 or 200 yds, but one gun is sighted in dead on at 300. While ballistic drop tables are usually good enough to get you close, you *have to* know your muzzle velocity. What is on the box isn't necessarily what your gun shoots. It all depends on how accurate you want to be, if you are looking for 2 moa out to 300 yds, sighting in at 100 and using the drop table should be plenty close enough. How long is the barrel on your gun, what bullet/load are you shooting and what distance do you plan on shooting? I have a few ballistic programs on the computer and knowing that information I can get you close. Any idea what the elevation is where you will be shooting? My .30-06 is a Ruger M77 Mark II, with a 22" barrel. I`m shooting the Federal 165 grain Trophy Bonded Tip cartridge. Because I don`t ever practice long distance shots, there`s no way I`d take a 300 yard shot, but if zeroed in at 200, I`d probably be ok with a 200 yard shot, only if using a shooting stick, or a very stable rest. I don`t have a chrono, so I`ve no idea what the muzzle velocity actually is.
|
|
|
Post by scrub-buster on Dec 15, 2019 14:44:20 GMT -5
I sighted mine in at 50 yards. The farthest I have shot a deer with it has been 25 yards. Our woods are thick. It's hard to get a long distance shot.
|
|
|
Post by parrothead on Dec 15, 2019 15:21:50 GMT -5
Dont know where ur at but Crosley has a 200 Yard range
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 15, 2019 15:33:52 GMT -5
Dont know where ur at but Crosley has a 200 Yard range We`re far west side of Indianapolis, nearly Avon.
|
|
|
Post by greghopper on Dec 15, 2019 17:23:37 GMT -5
|
|
|
Post by medic22 on Dec 15, 2019 18:34:11 GMT -5
I zero most centerfire rifles at 200
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 15, 2019 19:36:44 GMT -5
You`re right, I looked up Deer Creek FWA, and they have a hundred yard range, and so long as they allow centerfire rifles, I think I can zero at approximately inch and a half high at 100 and be good out past 200. I have a Caldwell "Tack Driver" bag for the rifles forearm, I suppose if I just am steady with the stock against my shoulder, I`ll be accurate enough.
|
|
|
Post by esshup on Dec 15, 2019 20:00:59 GMT -5
You`re right, I looked up Deer Creek FWA, and they have a hundred yard range, and so long as they allow centerfire rifles, I think I can zero at approximately inch and a half high at 100 and be good out past 200. I have a Caldwell "Tack Driver" bag for the rifles forearm, I suppose if I just am steady with the stock against my shoulder, I`ll be accurate enough. You can make or buy a small sandbag for under the rear of the stock. Make 6"x8" shims from 1/4" and 1/2" thick plywood to get the rear bag the correct height. Wait between shots or between groups of shots to let the barrel cool, you never want to get it hot enough so you can't rest your hand on the barrel right in front of the scope. Lemee run some numbers for ya.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 15, 2019 20:15:09 GMT -5
You`re right, I looked up Deer Creek FWA, and they have a hundred yard range, and so long as they allow centerfire rifles, I think I can zero at approximately inch and a half high at 100 and be good out past 200. I have a Caldwell "Tack Driver" bag for the rifles forearm, I suppose if I just am steady with the stock against my shoulder, I`ll be accurate enough. You can make or buy a small sandbag for under the rear of the stock. Make 6"x8" shims from 1/4" and 1/2" thick plywood to get the rear bag the correct height. Wait between shots or between groups of shots to let the barrel cool, you never want to get it hot enough so you can't rest your hand on the barrel right in front of the scope. Lemee run some numbers for ya. Wow, you would do that? Thank you.
|
|
|
Post by esshup on Dec 15, 2019 20:15:46 GMT -5
OK. IF the center of the scope to the center of the bore is 1.5", here's some info that should be close.
With 100 yd zero. 0 - -1.5" 50 yd - -0.15" 100 yd - 0 150 yd - -1.14" 200 yd - -3.7" 250 yd - -7.75" 300 yd - -13.44"
With 200 yd zero. 0 - -1.5" 50 yd - +0.77" 100 yd - + 1.85" 150 yd - + 1.63" 200 yd - 0 250 yd - -3.13" 300 yd - -7.89"
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 15, 2019 20:20:35 GMT -5
OK. IF the center of the scope to the center of the bore is 1.5", here's some info that should be close. With 100 yd zero. 0 - -1.5" 50 yd - -0.15" 100 yd - 0 150 yd - -1.14" 200 yd - -3.7" 250 yd - -7.75" 300 yd - -13.44" With 200 yd zero. 0 - -1.5" 50 yd - +0.77" 100 yd - + 1.85" 150 yd - + 1.63" 200 yd - 0 250 yd - -3.13" 300 yd - -7.89" Wow, thanks very, very much. From the data you`ve provided, a 100 yard zero would be more than adequate, because I couldn`t ever imagine trying anything out past 150 yards. Even if I ever got crazy and tried a 200 yard shot, I wouldn`t need very much holdover. My Leupold is only a 3X9, and really, unless I got a higher magnification scope. a 200 yard shot wouldn`t be very responsible for me to take anyway. Thank you very much for the data!
|
|
|
Post by esshup on Dec 15, 2019 20:25:36 GMT -5
You can make or buy a small sandbag for under the rear of the stock. Make 6"x8" shims from 1/4" and 1/2" thick plywood to get the rear bag the correct height. Wait between shots or between groups of shots to let the barrel cool, you never want to get it hot enough so you can't rest your hand on the barrel right in front of the scope. Lemee run some numbers for ya. Wow, you would do that? Thank you. Piece O cake, just put some numbers into the ballistic program and it spits out the answers. IF you know the actual fps at the muzzle, centerline of scope to centerline of bore, and have atmospheric data (elevation, baro, RH, temp.) AND know the actual bc of the bullet (vs. the published data) the program can calculate the bullet drop accurately enough so you can usually be within an inch or so (depending how accurate your gun is) out past 1,000 yds. i.e. the more accurate data you can feed the program, the more accurate data it will spit out.
|
|
|
Post by esshup on Dec 15, 2019 20:29:13 GMT -5
OK. IF the center of the scope to the center of the bore is 1.5", here's some info that should be close. With 100 yd zero. 0 - -1.5" 50 yd - -0.15" 100 yd - 0 150 yd - -1.14" 200 yd - -3.7" 250 yd - -7.75" 300 yd - -13.44" With 200 yd zero. 0 - -1.5" 50 yd - +0.77" 100 yd - + 1.85" 150 yd - + 1.63" 200 yd - 0 250 yd - -3.13" 300 yd - -7.89" Wow, thanks very, very much. From the data you`ve provided, a 100 yard zero would be more than adequate, because I couldn`t ever imagine trying anything out past 150 yards. Even if I ever got crazy and tried a 200 yard shot, I wouldn`t need very much holdover. My Leupold is only a 3X9, and really, unless I got a higher magnification scope. a 200 yard shot wouldn`t be very responsible for me to take anyway. Thank you very much for the data! Practice makes perfect is the saying. I've shot 2 1/2" group at 600 yd with a 10x scope.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 15, 2019 20:32:06 GMT -5
Wow, you would do that? Thank you. Piece O cake, just put some numbers into the ballistic program and it spits out the answers. IF you know the actual fps at the muzzle, centerline of scope to centerline of bore, and have atmospheric data (elevation, baro, RH, temp.) AND know the actual bc of the bullet (vs. the published data) the program can calculate the bullet drop accurately enough so you can usually be within an inch or so (depending how accurate your gun is) out past 1,000 yds. i.e. the more accurate data you can feed the program, the more accurate data it will spit out. You`d have to shoot through a chronograph to get the actual fps at the muzzle: yes? All the other information you mentioned, wow, that`s a lot of detail. I would have to believe that since 1.5" above the bore for the sights, (scope) is standard, that, that`s what this is, although I`ve never measured. And then, how would you determine the actual ballistic coefficient, and whether it`s different than what`s published?
|
|
|
Post by esshup on Dec 15, 2019 20:53:09 GMT -5
Piece O cake, just put some numbers into the ballistic program and it spits out the answers. IF you know the actual fps at the muzzle, centerline of scope to centerline of bore, and have atmospheric data (elevation, baro, RH, temp.) AND know the actual bc of the bullet (vs. the published data) the program can calculate the bullet drop accurately enough so you can usually be within an inch or so (depending how accurate your gun is) out past 1,000 yds. i.e. the more accurate data you can feed the program, the more accurate data it will spit out. You`d have to shoot through a chronograph to get the actual fps at the muzzle: yes? All the other information you mentioned, wow, that`s a lot of detail. I would have to believe that since 1.5" above the bore for the sights, (scope) is standard, that, that`s what this is, although I`ve never measured. And then, how would you determine the actual ballistic coefficient, and whether it`s different than what`s published? The distance above the bore height will vary according to ring height. Larger Objective typically needs higher rings, smaller, lower. The atmospheric data is easily obtained using a Kestrel portable weather meter, I have the 3500 model. Yes, actual fps is measured with a chronograph set "X" feet from the muzzle. The actual bc can be determined if you know the fps and you shoot at 100 & 300 (or further) yardage and measure bullet drop to the center of the group. That will put you in the ballpark for actual bc. Or if you trust your rifle, you can set the chronograph in front of the target at a known distance and get the bc by the amount of fps the bullet looses on the way to the target. That works best with a load that has low SD numbers. Then there's G1 and G7 bc. G1 is a static number, an average so to speak, G7 takes into consideration that a bullet bc changes according to it's fps. i.e. a bullet at 3,000fps has a better bc than one going 1,200 fps. I used a G1 bc to get your data.
|
|
|
Post by esshup on Dec 15, 2019 21:03:22 GMT -5
If you know the ballistic data from your rifle and load, and can get the atmospheric data, this app is pretty good for your phone. I have different programs for my desktop and laptop, but I have it on my phone. Applied BallisticsBUT, realistically, for anything under a few hundred yards you can use almost any ballistic program and print out a drop chart to tape to the rifle stock. Having one there, that includes wind drift is handy. Wind drift is harder to figure out than bullet drop. For instance, in a 10 mph full value (90°) crosswind, your bullet will drift: 100 Yd 0.7" 200 yd 3.1" 300 yd 7.2"
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 15, 2019 21:38:39 GMT -5
You`d have to shoot through a chronograph to get the actual fps at the muzzle: yes? All the other information you mentioned, wow, that`s a lot of detail. I would have to believe that since 1.5" above the bore for the sights, (scope) is standard, that, that`s what this is, although I`ve never measured. And then, how would you determine the actual ballistic coefficient, and whether it`s different than what`s published? The distance above the bore height will vary according to ring height. Larger Objective typically needs higher rings, smaller, lower. The atmospheric data is easily obtained using a Kestrel portable weather meter, I have the 3500 model. Yes, actual fps is measured with a chronograph set "X" feet from the muzzle. The actual bc can be determined if you know the fps and you shoot at 100 & 300 (or further) yardage and measure bullet drop to the center of the group. That will put you in the ballpark for actual bc. Or if you trust your rifle, you can set the chronograph in front of the target at a known distance and get the bc by the amount of fps the bullet looses on the way to the target. That works best with a load that has low SD numbers. Then there's G1 and G7 bc. G1 is a static number, an average so to speak, G7 takes into consideration that a bullet bc changes according to it's fps. i.e. a bullet at 3,000fps has a better bc than one going 1,200 fps. I used a G1 bc to get your data. Wow, you know your stuff. This is all way over my head and out of my league.
|
|
|
Post by oldhoyt on Dec 16, 2019 13:17:09 GMT -5
The more you learn about shooting, the more you realize there is to know.
The good thing for most hunters is that we can get by just fine with almost any deer cartridge, by sighting in an inch to 2 inches high at 100. This allows you to aim at the middle of the deer's chest (top to bottom) out to 200 yds and that's a lot farther than 95% of hunters will shoot.
|
|