Thread: Different way to zero

Hi Guys ,

Just been to the range to zero a scope , and it has to be done a different way than the normal way of clicking the knobs to the required measurement , shooting & then slipping the knobs to read zero .

The scope is a USO MST-100 ( old USMC type ) , and the way you zero IT is shoot it with say Elevation on 100 & Windage on 0 , then you loosen the allen screws on both the knobs , then put the crosshair back on the aiming point , and hold/sandbag the rifle so it will not move , then put a allen key into the top center of the knobs , and with the rifle very still , turn the allen keys while looking thru the scope , and adjust the reticle to be on the aim point .

Due to the design of the scope , you have to use this exact procedure , nothing else will work with this scope .

SO thinking about it , you could use the same procedure on other scopes as well , with maybe only a few rounds used , BUT the tricky put is keeping the rifle absolutely still while looking thru the scope & turing the knobs etc , and be prepared to turn in the wrong direction to start with , before you pick up on it and go the right way .

Here's pics of the rifle and scope .







Later Chris

How did it shoot?

Those MST100s look so cool


e: what's it calibrated for?

Originally Posted by ChrisF

... and with the rifle very still , turn the allen keys while looking thru the scope , and adjust the reticle to be on the aim point...

I think you mean point of impact here, not aim point. You start with the reticle on the point of aim and adjust it to the point of impact, without moving the rifle.

I thought that was a common practice. Eg bore sighting

Its to early to say for sure , lets just say , at this stage I am very happy so far , and IF its not , I will just drop another coldhammer forged barrel on her , and move on .
Yeap the MST-100 is cammed for 173-175gr bullet at 2600fps ( I am using 175gr SMKs ) , and I am lucky to have 2x MST-100s , one on this rare Parker Hale M87 ( C3A1 clone ) , and one ready to go onto a Rem700 thats being made into a M40A1 clone at the moment .
These scopes have a parallex adjustment in the front thats meant to be adjsuted to the range you want and then locked down with a spanner , so its a re-settable rather than a readily adjustable para feature , and TRUST me on this , NEVER ever touch it , ensure its locked OFF , and forget it exists ( and YES that is from actuall experience ) .
IF you donot , expect to spend a day trying to get it sorted , and only to give UP .
At this stage , I am VERY happy with this rifle , its a dream come true for me , and a build thats taken years & years ( closer to a decade ) .

Later Chris

At no time did I mention looking thru the bore ?
So its not exactly boresighting .
Bore sighting to me is only a very rough method , to get you on paper .
This can be used to actually fully zero a rifle .
Any way , just thought it would be another way for guys to zero , this scope manual also has a measurement to confirm the scopes zeroed correctly , and its able to be done at 900 inches , ie 25yds , with the scope set on 3 ( 300yds ) .

From actuall experience , as NICE as these scopes are , the world has turned , and you can buy better Tac scopes , to me these scopes really ONLY make sense , to stubborn Bas$%^ds , that have too , want too make a replica of either the Canadian C3A1 or USMC M40A1 sniper rifles.

At the moment , their are some neat smallish scopes coming out for rifles , that make more practical sense , like the 2.5-10x42 NF or the new Bushy 3-12x44mm LRHS .

Later Chris

What sort of bag setup are you using Chris that negates the rifle moving away from P.O.A under recoil?

Also, agree with Gimp. The MST100's look mean!!

It moves under recoil , BUT I re-align the crosshair after , YEAP as to whats holding the rifle up , its a Harris bipod at front , and a black plastic rubbish bag filled with black tactical , beach sand .

I need another type of rear bag , as this black plastic bag is leaking bloody sand every where , its cheap thro

Sounds like a terrible and frustrating way to sight in unless you can lock the rifle down hard from start to finish.

I tried something similar last week - sighting in by adjusting the reticle to the initial point of impact.

The scope was mounted and "boresighted" in a shop but even at 50 yards it was way off.

I had the rifle in a Caldwell Lead Sled so it was fairly easy to hold the rifle on the initial point of aim and the adjust to the initial point of impact.

New rifle first 9x shots and average factory ammunition - here are some photos and notes.

As I said , WITH this scope , ( MST-100 ) , you have NO choice in the way you do the zeroing .
Its not too bad , as along as you have the means to keep the rifle in position , ie sand bags & bipod etc , IT is very different to what most are sue to however .

And IF you did not pickup on IT , I'm Loving IT !!!!!

Just curious, why is that the only way? Why can't you sight it the normal way?

Originally Posted by Savage1

Just curious, why is that the only way? Why can't you sight it the normal way?

+1. Do the turrets not click at all? Isnt it just like having a custom turret with m marks on it?