The Zero Check Thread

[gimp]

Date: 25/1/2025
Range: 100m (laser verified)
Rifle: Remington Model 7 .223
Optic: March F 3-24x42
Mounts: Talley Ultralight 30mm Low - ring caps torqued to 20in/lb; base screws torqued "farmer tight and forgotten about"
Ammunition: Hornady Match 73gr ELDM Factory
Context: Last zero checked 15th December. Since then has driven from Hokitika to Central Otago twice, been 4wding, lain on the back floor of a Hughes 500 flying around for a few hours, shot 3 deer, 9 pigs, and about 20 odd goats. Last cleaned maybe 150-300 rounds ago - I don't remember.

Zero is within 0.1MRAD of centre. I will re-check and see if it has shifted after my next trip (next week).

I have not experienced issues with this system and zero shift in the past in real use.

Note I fired 2x 10 round groups - overlaid both make around a 0.9MOA 20-shot aggregate with a mean radius of about 0.06MRAD. Note even with a reasonably precise system with no recoil, and 10 shot groups to establish zero, there is about a 2mm different in both axes for the MPOI of each group.

Mean POI of all 20 shots overlaid is 0.07; -0.018 MRAD. I can compare a future zero check MPOI to this.

[gimp]

Date: 25/1/2025
Range: 100m (laser verified)
Rifle: Remington Model 7 .223
Optic: March F 3-24x42
Mounts: Talley Ultralight 30mm Low - ring caps torqued to 20in/lb; base screws torqued "farmer tight and forgotten about"
Ammunition: Hornady Match 73gr ELDM Factory
Context: Last zero checked 15th December. Since then has driven from Hokitika to Central Otago twice, been 4wding, lain on the back floor of a Hughes 500 flying around for a few hours, shot 3 deer, 9 pigs, and about 20 odd goats. Last cleaned maybe 150-300 rounds ago - I don't remember.

Zero is within 0.1MRAD of centre. I will re-check and see if it has shifted after my next trip (next week).

I have not experienced issues with this system and zero shift in the past in real use.

Note I fired 2x 10 round groups - overlaid both make around a 0.9MOA 20-shot aggregate with a mean radius of about 0.06MRAD. Note even with a reasonably precise system with no recoil, and 10 shot groups to establish zero, there is about a 2mm different in both axes for the MPOI of each group.

Mean POI of all 20 shots overlaid is 0.07; -0.018 MRAD. I can compare a future zero check MPOI to this.



Attachment 267550

Attachment 267551

Attachment 267553

Attachment 267554

Check today. 1 click left from last time cos I realized I can. 105M and shooting off hard concrete - slight change in conditions

Zero today 0.015MRAD right, 0.12MRAD low. Maybe a zero shift down of 1 click?

Rifle has driven around a bunch, flown in a helicopter on the floor and shot 50 or so animals in the last 2 weeks. 4 days hunting. I won't draw any conclusions yet - I rarely shoot off concrete and would expect a possible change in POI from that, and would expect 0.02MRAD or thereabouts lower from the longer range - this group is roughly within the prior cone of fire.

[Tentman]

Check today. 1 click left from last time cos I realized I can. 105M and shooting off hard concrete - slight change in conditions

Zero today 0.015MRAD right, 0.12MRAD low. Maybe a zero shift down of 1 click?

Rifle has driven around a bunch, flown in a helicopter on the floor and shot 50 or so animals in the last 2 weeks. 4 days hunting. I won't draw any conclusions yet - I rarely shoot off concrete and would expect a possible change in POI from that, and would expect 0.02MRAD or thereabouts lower from the longer range - this group is roughly within the prior cone of fire.

Attachment 268535

Very nice shooting. Wish I could do that with mine. Haha.