Question:
If you were shooting 165 grain bullets and switched to 180 grain would, or how much would this throw off the accuracy of your gun? Can you get away with it or would you need to resight in? Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: http://sportsmansweb.com/hunting/
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> If you were shooting 165 grain bullets and switched to 180 grain would, or > how much would this throw off the accuracy of your gun? Can you get away > with it or would you need to resight in?
Depends on the individual gun (not just the make and model) … some are real sensitive, others seem oblivious. Some will show more change in point of impact coming from changing brands of bullets that weigh the same than changing weight of bullet. The only way you’re going to find out what’ll happen in your gun is to go get a couple boxes of ammo and head for the range. Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: http://sportsmansweb.com/hunting/
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> If you were shooting 165 grain bullets and switched to 180 grain would, or > how much would this throw off the accuracy of your gun? Can you get away > with it or would you need to resight in?
I would take it to the range and see. Rifles are individuals, some won’t show much change in impact with a minor change in loading, others will. Odds are it will change point of impact, but by how much, can’t tell until you check it out. Scott Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: http://sportsmansweb.com/hunting/
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With any gun, when you change bullet weights, you should reconfirm your sight settings. Also, with a rifle, you should change your adjusted point blank settings. Example. if you sight in 1" high to be dead on at 200 and know you are 1 1/2 high at 50 with the old bullet, you need to recompute the trajectory for the new bullet weight and velocity. Good Luck, Bandit > If you were shooting 165 grain bullets and switched to 180 grain would, or > how much would this throw off the accuracy of your gun? Can you get away > with it or would you need to resight in? > Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: > http://sportsmansweb.com/hunting/
Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: http://sportsmansweb.com/hunting/
Response:
>If you were shooting 165 grain bullets and switched to 180 grain would, or >how much would this throw off the accuracy of your gun? Can you get away >with it or would you need to resight in?
The politicians answer is "probably". A rule of thumb is that different weight bullets, even different brands of the same weight, will shoot to a different point of impact (POI). How much the change is depends on the rifle. I have a 25-06 that will put Sierra 75g HPs and Speer 100g HPs to the same POI at 100 yds. But any 120g load shifts 2" low/2"left. I’m going to get nailed by the purists for this one , but , In the case of some wierd deal (like you forgot and left your ammo at home and your hunting buddy has the same caliber in a different weight), you could get away with it if _*you restrict your shots to LESS than a hundred yards*_. I can’t remember having a bullet weight change move the POI over three or four inches at that range. And I’ve seen lots of hunters who couldnt keep their shots closer together than that. Bill Van Houten (USA Ret) "No matter how hard you try, you can’t throw a potato chip very far." "Linus" Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: http://sportsmansweb.com/hunting/
Response:
- Hide quoted text — Show quoted text ->If you were shooting 165 grain bullets and switched to 180 grain would, or >how much would this throw off the accuracy of your gun? Can you get away >with it or would you need to resight in? > I’m going to get nailed by the purists for this one , but , In the case of > some wierd deal (like you forgot and left your ammo at home and your hunting > buddy has the same caliber in a different weight), you could get away with > it if _*you restrict your shots to LESS than a hundred yards*_. I can’t > remember having a bullet weight change move the POI over three or four > inches at that range. And I’ve seen lots of hunters who couldnt keep their > shots closer together than that.
No argument from me, Bill…and, given the adrenalin that starts to flow when you take aim on a game animal, it it likely that shaking the rifle will vary the shot more than a small weight difference. In most cases an increase in weight of a 165 grain bullet in a .30-06 to 180 grains (on a gun zero’ed at 200 yards) the difference at 100 yards is about 1/2". Hell, I do more than that shivering in the cold. Yale Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: http://sportsmansweb.com/hunting/
Response:
I’ve got a couple of ballistics texts here (Pesja for one, Rinkert the other) wherein I’ve learned that with a heavier bullet, the barrel travel time increases, therefore the muzzle rises more in recoil and the bullet hits a little higher on target (at similar ranges to a somewhat calculable distance where the heavier bullet will drop more for a given distance as it’s not traveling as fast and has more drag, etc). Generally, given this situation you’ve described, yes, you’d need to sight in the gun again and dope out the drop tables for THAT round in THAT gun. Have fun. Norm Balog, D.O. Family Medicine and Firearms Counseling NRA pistol instructor, RSO Socialist Occupied Maryland > If you were shooting 165 grain bullets and switched to 180 grain would, or > how much would this throw off the accuracy of your gun? Can you get away > with it or would you need to resight in? > Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: > http://sportsmansweb.com/hunting/
Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: http://sportsmansweb.com/hunting/
Response:
>I’ve got a couple of ballistics texts here (Pesja for one, Rinkert the >other) wherein I’ve learned that with a heavier bullet, the barrel travel >time increases, therefore the muzzle rises more in recoil and the bullet >hits a little higher on target (at similar ranges to a somewhat calculable >distance where the heavier bullet will drop more for a given distance as >it’s not traveling as fast and has more drag, etc). > If you were shooting 165 grain bullets and switched to 180 grain would, or > how much would this throw off the accuracy of your gun?
As a practical example, I have 180-gn and 150-gn Partition handloads for my 30-06 that impact in the same place at 100 yards, even though the 150’s are going 200 fps faster. But anytime you change ammo you have GOT to re-sight your rifle, or at least check it. And, as always, anyone who thinks that they will be attempting a shot on game over maybe 175 yards owes it to the animal to practice at those longer ranges and prove to themselves that they can hit a 6-inch circle (for deer) every time. At the distance you can’t keep it in that circle anymore, you’ve hit your long range limit, regardless of the cartridge you are shooting… -jeff Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: http://sportsmansweb.com/hunting/
Response:
– Hide quoted text — Show quoted text -> I’ve got a couple of ballistics texts here (Pesja for one, Rinkert the > other) wherein I’ve learned that with a heavier bullet, the barrel travel > time increases, therefore the muzzle rises more in recoil and the bullet > hits a little higher on target (at similar ranges to a somewhat calculable > distance where the heavier bullet will drop more for a given distance as > it’s not traveling as fast and has more drag, etc). > Generally, given this situation you’ve described, yes, you’d need to sight > in the gun again and dope out the drop tables for THAT round in THAT gun. > Have fun. > Norm Balog, D.O. > Family Medicine and Firearms Counseling > NRA pistol instructor, RSO > Socialist Occupied Maryland > If you were shooting 165 grain bullets and switched to 180 grain would, or > how much would this throw off the accuracy of your gun? Can you get away > with it or would you need to resight in?
As soon as a bullet leaves the barrel it is subjected ot the law of gravity. if it is in the air for 1second it is going to drop 9.8 meters so the faster that tht bullet is going the less time it spends between the muzle and target so the less it is going to drop. A heavier bullet is more aerodynamic than a lighter bullet of the same make and design and has more momentum so it will not lose velocity as quickly in proportion to a light bullet. I think I got that right. Dan Hockly > Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: > http://sportsmansweb.com/hunting/ > Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: > http://sportsmansweb.com/hunting/
Visit the rec.hunting and rec.hunting.dogs FAQ Home Page at: http://sportsmansweb.com/hunting/
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