Zeroing in scope

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Zeroing in scope

Post by JWS_777 » 01 Sep 2017, 8:53 am

Hi All,

I've just had the scope fitted to my 57 Brno Mod 2 and aim to visit a range in the coming weeks. Is zeroing the scope in at 50m the way to go?

The use of the rifle will be for bunnies/ foxes and some target stuff. Providing the gun likes it the ammunition will be Winchester power-points (40 grain).

See attached pic. Been a 3 month journey getting to this point.

Cheers
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Re: Zeroing in scope

Post by in2anity » 01 Sep 2017, 9:02 am

Well I zero for 40m, then I know exactly how many clicks to come up for 60m, 77m and 100m; that's +11,+12,+17 = 40 (using subs). In case you didn't notice that's the rimfire silhouette distances! Does this translate well back into hunting scenarios? yep sure does! I'm very confident to take a head-shot on a bunny anywhere inside 100m provided I'm given a moment to tweak my sights.

But probably the most important point here though is stick to the one ammo type and zero and practice, practice, practice! Then tweaking you sights becomes a no-brainer...

But for purely hunting scenarios IMO a 75 yards zero is better; have a read of this chuckhawks article on the subject matter: http://www.chuckhawks.com/sight_22_75yds.html
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Re: Zeroing in scope

Post by JWS_777 » 01 Sep 2017, 9:33 am

Great info and appreciated the reply. All makes sense and I'm definitely looking to hit the range many a time re practice.

Thanks for sharing.
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Re: Zeroing in scope

Post by in2anity » 01 Sep 2017, 9:57 am

:drinks:
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Re: Zeroing in scope

Post by in2anity » 01 Sep 2017, 11:54 am

For those of us who CBF reading the article; for hunting purposes if you want to always just point-and-shoot, a ~66m zero is optimal, don't take shots past ~82m and always stick to the one brand of supersonic ammunition. This way you will have a maximum variation of +/-1.5" inside 82m.
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Re: Zeroing in scope

Post by bladeracer » 01 Sep 2017, 3:06 pm

in2anity wrote:For those of us who CBF reading the article; for hunting purposes if you want to always just point-and-shoot, a ~66m zero is optimal, don't take shots past ~82m and always stick to the one brand of supersonic ammunition. This way you will have a maximum variation of +/-1.5" inside 82m.


Three-inches spread is too much for .22LR in my opinion. You have to add the ability of the rifle to that remember. At 82m you might be lucky to hold 2" groups under field conditions, which gives you a spread potential of anywhere within a five-inch circle.

I would go with a 50m zero which gives you a MPBR of around 60m with only one-inch spread. If youre going to shoot a rabbit past 60m I suggest you hold over whatever is required to get a brain strike, or get closer.
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Re: Zeroing in scope

Post by in2anity » 01 Sep 2017, 3:14 pm

bladeracer wrote:
in2anity wrote:For those of us who CBF reading the article; for hunting purposes if you want to always just point-and-shoot, a ~66m zero is optimal, don't take shots past ~82m and always stick to the one brand of supersonic ammunition. This way you will have a maximum variation of +/-1.5" inside 82m.


Three-inches spread is too much for .22LR in my opinion. You have to add the ability of the rifle to that remember. At 82m you might be lucky to hold 2" groups under field conditions, which gives you a spread potential of anywhere within a five-inch circle.

I would go with a 50m zero which gives you a MPBR of around 60m with only one-inch spread. If youre going to shoot a rabbit past 60m I suggest you hold over whatever is required to get a brain strike, or get closer.


At 82m you'll likely have something to rest on or be able to slip into a kneel or sit; if so my 22 will easily put them into an inch (even under field conditions). The variance is never more than 1.5" + 1" = max spread of -2.5", and that's at 82m. At 50m it'll be max 2" high", at 75m it'll be a max 2" low, keep that in mind and you hit every time.
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Re: Zeroing in scope

Post by bladeracer » 01 Sep 2017, 3:26 pm

in2anity wrote:
bladeracer wrote:At 82m you'll likely have something to rest on or be able to slip into a kneel or sit; if so my 22 will easily put them into an inch (even under field conditions). The variance is never more than 1.5" + 1" = max spread of -2.5", and that's at 82m. At 50m it'll be max 2" high", at 75m it'll be a max 2" low, keep that in mind and you hit every time.


Do you mean by "keeping that in mind" that you are actually making allowance for the trajectory instead of holding dead on?
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Re: Zeroing in scope

Post by in2anity » 01 Sep 2017, 3:31 pm

bladeracer wrote:Do you mean by "keeping that in mind" that you are actually making allowance for the trajectory instead of holding dead on?

Yep hold a whisker under around 40-50m, and a whisker over for 70-80m (if you want a really precise shot)
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Re: Zeroing in scope

Post by brett1868 » 01 Sep 2017, 3:42 pm

That counter in the picture is familiar but the vise is on the wrong side of the shop :) What others haven't mentioned yet is that the 22LR can favour a certain type / brand of ammunition. Buy a few different boxes, test them all and settle on the one with the most consistent sized group before buy in bulk. I'm assuming you'll do some testing at the St Marys range and if that's the case get in touch via PM and I'll come along with my assortment on 22LR ammo you can test with.
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Re: Zeroing in scope

Post by BRNO_Bigot » 02 Sep 2017, 1:25 pm

In general - find a brand of ammo your rifle "likes" and practice a lot with that.

When changing brands, clean the barrel before starting with the new stuff and fire 10-20 rounds to "season" the barrel before shooting for groups again. Yes, I know it sounds like voodoo, but it seems to make a difference.

I, personally sight in at 70m and then I'm okay on whatever I want to shoot out to about 85m.

If your game is smaller than the francolin and guinea fowl I was after, sight in a bit closer and (50m) and work from there.

in2anity has some good suggestions, and Brett's offer can't be beaten.
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Re: Zeroing in scope

Post by JWS_777 » 03 Sep 2017, 7:57 pm

Brett you're a champion mate and will PM you. Very generous and actually picked up a couple of boxes that day I visited the store for my scope fitting.
Brno great info and appreciate the reply and info shared.
2nd post but a great forum to be involved with.

Cheers Jimmy
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Re: Zeroing in scope

Post by in2anity » 03 Sep 2017, 8:06 pm

Nice rifle too btw JWS - those old mod 2s drive tacks. Plenty of the blokes use them for comp rimfire silhouette and they hold their own against the lithys and annies no worries. Pinnacle of the CZ 22 IMO.
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Re: Zeroing in scope

Post by JWS_777 » 03 Sep 2017, 8:32 pm

Thanks mate, was quite a search to locate an early Mod 2 (in decent condition) but feel honoured to own her! Like the sounds of the comp rimfire and is something I'll look into once I get going.

Got a bunny hunt locked in mid Oct so will share a few pics.

Thanks
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Re: Zeroing in scope

Post by scotty87 » 03 Sep 2017, 9:15 pm

I was going to put a Nikon prostaff on my 1967 Brno mod 2 but the iron sights are such a joy to use I'm considering leaving it like that, make sure you try SK standard plus, I've shot moa groups with it in every .22 I've used it in, not sure how it goes on game however
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Re: Zeroing in scope

Post by brett1868 » 03 Sep 2017, 10:21 pm

JWS_777 wrote:Brett you're a champion mate and will PM you. Very generous and actually picked up a couple of boxes that day I visited the store for my scope fitting.
Brno great info and appreciate the reply and info shared.
2nd post but a great forum to be involved with.

Cheers Jimmy


No worries and hopefully the boys at Magnums got you sorted :)
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Re: Zeroing in scope

Post by Wombat » 04 Sep 2017, 8:41 am

Very nice looking model 2, mine is a much used 72 production. The powerpoints do shoot well out of it, but it does shoot even better with SK. What scope did you decide to fit?
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Re: Zeroing in scope

Post by Gamerancher » 04 Sep 2017, 10:40 am

in2anity wrote, "Plenty of the blokes use them for comp rimfire silhouette and they hold their own "
Our National Champion actually uses a bog standard BRNO No.2 barrelled action albeit in a custom off-hand stock with some trigger work done.
I tried to convince a new shooter that was interested in the sport that a Model 2 BRNO was all he needed. That day at the range for a club match, more than 50% of the rifles were BRNO's or CZ's.
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