User Panel
User Panel
User Panel
|
Posted: 9/25/2018 10:13:44 PM EDT
[#1]
Every barrel is different. I suggest that when you buy a case, you use a box to verify and record zero for future reference.
|
|
|
|
Posted: 9/26/2018 2:56:05 PM EDT
[#2]
Yeah, every gun is different down to the barrel, hardguard, how much ft lbs the muzzle device is torqued, ect.. Better to just shoot and see. If anything generally lighter grain bullets with faster velocities shoot higher POI rather than lets say a 75gr 223 load.
|
|
|
|
Posted: 9/26/2018 3:56:36 PM EDT
[#3]
i have 2 or 3 barrels that have nearly the same POI at 50 yds for various bullets/ammo but at 100 yds they start to change noticeably in windage more so than elevation.
the other 5 or so barrels i have shot to test this have all been very different POI's at 50yds. |
|
|
|
Posted: 9/26/2018 4:12:36 PM EDT
[#4]
Gotta shoot it.
My AR10 A4 20 had two extremely accurate handloads. Both 1moa for 5 shots with a non freefloated handguard. Zero for through the crosshairs with my 165grn H322 load and the other accurate load would print it's group 2 inches low and 3 inches left. Very consistent and predictable result. |
|
|
|
Posted: 9/26/2018 5:04:55 PM EDT
[#5]
I have an 11.5" Noveske SS barrel that shoots BH 77TMK a consistent 1/2" lower than 62MSR @50yds. The gap widens to just over 1.5" @ 100yds. The same barrel dumps Federal M193 to the left about 1" and slightly higher than the bull @ 50yds.
Haven't tested the rounds head to head in different guns but I'm happy with the result, seeing that those are my two "main" SD rounds and main training round. |
|
|
|
Posted: 9/26/2018 7:27:36 PM EDT
[#6]
M193 thread life expectancy today? Short lived.
|
|
|
|
Posted: 9/27/2018 1:30:36 AM EDT
[#7]
What causes the change in windage? Elevation I understand better.
|
|
|
|
Posted: 9/27/2018 1:58:12 AM EDT
[#8]
Quote HistoryQuoted:
What causes the change in windage? Elevation I understand better. Want to know where two different loads shoot out of your rifle, go shoot it on paper. That’s the only way to know. |
|
|
|
Posted: 10/1/2018 11:49:25 AM EDT
[#9]
Quote HistoryQuoted:
What causes the change in windage? Elevation I understand better. Not every time, but if you switch to different bullet weight, or same bullet's weight is the same but the bullet's are a different length. Windage shift is common if you shoot bench, you see it a lot. Sometimes when you expect it to happen , it won't, lol. You can get a 55gr to shoot into the same hole as a 68bthp or some such for example if barrel vibes are the same. Barrel vibes when the bullet exits, if the barrel is only 1/32" difference from barrel whip in one direction than another bullet, at 100yds that adds up to several inches easy. Watch some You-tube vides on slow-motion shooting of the barrel when the trigger is pulled, be prepared to get blown away by what you see! |
|
|
|
Posted: 10/1/2018 5:31:11 PM EDT
[#10]
As above, every barrel is different. You’ll want to see for yourself. Having said that, I must be lucky. I’ve never had much more than about 1.5 MOA shift tops @100 even going to extremes like 50gr vs 77gr.
|
|
|
|
Posted: 10/3/2018 4:07:46 PM EDT
[#11]
I only track poi shift in my 308 bolt gun. It is difficult to predict without shooting.
|
|
|
|
Posted: 10/3/2018 10:01:21 PM EDT
[#12]
When you guys say "every barrel is different" do you mean if I have two of the same gun I can expect different results? If I shoot two 6920's they'll have a different POI shift between ammo types?
|
|
|
|
Posted: 10/3/2018 10:48:25 PM EDT
[#13]
Quote HistoryQuoted:
When you guys say "every barrel is different" do you mean if I have two of the same gun I can expect different results? If I shoot two 6920's they'll have a different POI shift between ammo types? If you're concerned about it, it's best to test your ammo types in your barrels with your ammo. |
|
|
|
Posted: 10/7/2018 4:58:42 PM EDT
[#14]
Quote History[b]Quoted:[/b If anything generally lighter grain bullets with faster velocities shoot higher POI rather than lets say a 75gr 223 load. |
|
|
|
Posted: 10/7/2018 6:02:59 PM EDT
[#15]
Quote HistoryQuoted:
I would think that at the moment that powder ignition takes place and the barrel starts to raise due to recoil, that a light, fast bullet would leave the barrel in less time resulting in a lower POI, than a heavier, slower bullet which would take a longer time to leave the barrel resulting in a higher POI. Am I wrong? |
|
|
|
Posted: 10/7/2018 8:21:15 PM EDT
[#16]
Quote HistoryQuoted:
You are correct. Quote HistoryQuoted:
Quoted:
I would think that at the moment that powder ignition takes place and the barrel starts to raise due to recoil, that a light, fast bullet would leave the barrel in less time resulting in a lower POI, than a heavier, slower bullet which would take a longer time to leave the barrel resulting in a higher POI. Am I wrong? |
|
|
|
Posted: 10/9/2018 7:21:41 AM EDT
[#17]
Quote HistoryQuoted: A bullet is long gone by the time the recoil impulse moves the barrel |
|
|
|
Posted: 10/9/2018 9:36:41 PM EDT
[#18]
Quote HistoryQuoted: Not with the guns I shoot, rifle or pistol. it's so simple to test it's funny you haven't seen it yet. lol |
|
|
|
Posted: 10/11/2018 2:59:36 PM EDT
[#19]
Quote HistoryQuoted: What would happen when 2 different weight rounds are fired from a non-recoiling fixed test barrel? If recoil was affecting poi, would they now hit the same place? |
|
|
|
Posted: 10/11/2018 5:32:39 PM EDT
[#20]
Quote HistoryQuoted: What would happen when 2 different weight rounds are fired from a non-recoiling fixed test barrel? If recoil was affecting poi, would they now hit the same place? You didn't go to u tube and check it out did you? Even a blind person can see the barrel bend as the shot goes off. Holding the gun yourself inflicts even more changes, hold it loose, than hold it tight, hold it with your arm on top vs hand on bottom. Shoot a non floater with your left hand way out front vs way back by the magazine well and see for your self! |
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
