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Old August 15th, 2017, 05:11 PM #51
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Quote:
Originally Posted by kalister1 View Post
Adjust the sights/scope to hit where you want with the ammo you intend to use at the distance you expect to do most of your shooting.
IE: Hunting/Target.
Practice with anything you can get your hands on and only worry about group size. POI will change, but group size with practice ammo is all that really matters.
Hunting with Bullet A and practice with Bullet B. Bullet B will not always hit were you want it to, BUT, you will be able to see the pattern. Always 2"low.....?
If you see bullet B POI shifting, you may just have a problem?
^^^This can not be stressed enough. No point in shooting up all your 'plan A' ammo. Shoot your 'plan B and C' ammo to keep sharp once you've established you preferred ammo's zero. It probably won't group as well. That's why it is plan B. I do this all the time.
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Old August 15th, 2017, 05:38 PM #52
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Quote:
Originally Posted by Doco Overboard View Post
Today we (the boys) sighted two rifles at 100 yds two inches high to get a 250 yd zero. They are 3 inch low at 300 and if DBD's calculations are correct, will be 14" low at 400. They want to be able to hit a 17" vital area on a large deer. I plan to get a whole lot closer. Including volleyball bore sight they expended 17 rounds. One rifle, a pump was bore sighted with a laser bore sighter and the other a bolt action, volleyball with a primer knocked out of an old case that had been drilled out with a 1/8" drill bit.
They wanted 7mm mags to keep them out of the cripples near the river. I like a 7x57 because It doesn't rattle my teeth or give me headache when bench shooting.
757 is also great for elephants
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Old August 15th, 2017, 07:53 PM #53
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WDM Bell approves .

But seriously 7x57 is an excellent hunting round .
With proper bullet selection it is well suited from deer sized game, up through truely big game . And does so with modest recoil .
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Old August 15th, 2017, 09:11 PM #54
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I learned a tough lesson today. The sights I am using started loosening up after shooting a bunch of rounds. I noticed it after about 40 rounds. I hand tightened it back up but didn't have enough time to keep shooting. I guess I need a different mount or some Loctite.

Does that mean I now have to go through the whole sighting/zero process again?
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Old August 15th, 2017, 09:36 PM #55
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Quote:
Originally Posted by pilot25 View Post
I learned a tough lesson today. The sights I am using started loosening up after shooting a bunch of rounds. I noticed it after about 40 rounds. I hand tightened it back up but didn't have enough time to keep shooting. I guess I need a different mount or some Loctite.

Does that mean I now have to go through the whole sighting/zero process again?
Theoretically no. Realistically yes.
Theoretically if you mounted something in a certain place and torqued it to a value and then removed it and retorqued it to the same value and location it "should" hold zero.

But you really need to rezero it.
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Old August 15th, 2017, 09:40 PM #56
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Quote:
Originally Posted by mopar92 View Post
Theoretically no. Realistically yes.
Theoretically if you mounted something in a certain place and torqued it to a value and then removed it and retorqued it to the same value and location it "should" hold zero.

But you really need to rezero it.
You may be surprised, it may be relatively close to where it was. ^
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Old August 15th, 2017, 11:55 PM #57
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It may or may not end up shooting close to intended when properly torqued. But you will need to shoot it to see . If its still on great, if not then rezero.
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Old August 16th, 2017, 12:18 AM #58
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zero

0. Use laser bore sight to adjust sight and get on paper.
1. Get on paper at 50 yards and zero w/ cheap ammo
2. Repeat at 100 yards and get a group around the bulls eye
3. Shoot 3-5 round groups of different hunting loads to see which ammo your riffle likes and groups the best with. Don't worry about them being away from the bulls eye, pick the tightest grouping ammo, then re-zero using this ammo.
4. If you have a laser bore sighter, record the offset of the red dot once your preferred ammo is zero'ed. Once you travel to your hunting location, verify the red dot location at 100 yards to ensure the scope has not moved w/o having to fire test rounds to confirm zero although it is always best to fire a fouling round at your location to verify zero if you are not worried about disturbing game.
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Old August 16th, 2017, 12:07 PM #59
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After zeroing at whatever distance, say 100 yards, I like to shoot a couple groups at 50 yards or vis versa. I want to determine if there is a windage change relevant to distance. This would allow me to detect any horizonatal deviation of sight/optic and bore centerlines. I find it especially useful on front sights which are drift installed/adjustable.
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