how much loss of zero between 180 and 200gr

I'd take a quick trip to the range buddy. They may even need some windage adjustment. I've seen lots of loads shoot a little to one side or another with just a charge difference, let alone a different bullet, and a different grain.
 
bronco_mudder said:
I'd take a quick trip to the range buddy. They may even need some windage adjustment. I've seen lots of loads shoot a little to one side or another with just a charge difference, let alone a different bullet, and a different grain.
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I agree, a few rounds at the range may save you a lot of headache. It may also get you that big buck!:D
 
Recently, I noticed the difference in POI between 150gr and 180 gr launched form a 300 WM ...4 inches in elevation and 2 inches in windage...Time to hit the range.:)
 
Might be close, might not. I have been shooting 110gr, 165gr, and 180gr out of my .308 and they're all bang on for windage, and only 3" total difference in elevation.

Best to stick with 200gr or re-zero though...:)
 
if they group ok, re-sighting in shouldnt take more than a handful of rounds...and save a few to check impact at 200,300, etc
 
I listened to a gun shop owner and bought Federal spire point 175 gr spire point ammo to sight in my 7mm roughly and Federal Premium fancy 175 gr bullets to hunt with thinking I could shoot a couple of the premium ones just to confirm my zero. The cheap stuff had three touching at 100 yards, a two inch group at 200 and a 4 inch group at 300 centered around the X. Thinking I was done I shot one of the premium rounds at the 300 yd target, off the paper. At the 200, off the paper. At the 100 yd target a couple of rounds, one inch high and 4 1/2 inches left! By this time I had wasted a quarter of my $70 box of premium ammo and decided rather than wasting the time and ammo to get so well sighted in with the premium ammo to just take the cheap stuff. I bought a couple more boxes of the cheap stuff. Same manufacturer, same brass, same weight bullet, same shape bullet more or less and 4 inches left at 100 yards. Elevation I could expect but so much windage! I couldn't believe my eyes.
 
I think the solution is to not be so lazy, so I found a sale on Nosler Partions and will work up a load and sight in for that and stick with it.
 
How long does it take you to site in? One or two shots should tell you where you are.

Make the adjustment. Shoot a couple more and go hunting.

We re-zero before every hunting season no matter if its the same batch of bullets that we shot last year. You're scope might have got bump, screws might have wiggled lose somehow. Who knows.

We somtimes do it the morning of the hunt.

If its a choice between 15 minutes at the range and maybe missing that buck of your life... I think its an easy pick.
 
It all depends on your rifle and the loads. There might be some change in windage from your previous zero or there might not be. If there is no change it is a very happy coincidence, but don't count on it.

It is also prudent to check your loads at intermediate and long range. A load that prints well at 100, is acceptable at 200, might not even be on paper at 300. Conversely some loads that are only so-so at 100 might group like match bullets at 300. It depends how far you intend to shoot, but checking the point of impact out to 300 yards with rifles in the .30/06 class is probably prudent.
 
Hell, I have a box of Winchester 130g 270 shells from 5 years ago, sighted in with them yesterday. Bought 3 new boxes of the exact same ammo and shot them to be sure they went to the same spot. They didn't shoot to exactly exactly the same spot, went a few inches left.
 
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