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OP
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I have built a 6.5saum that will be my long range hunting rifle. 600 yards will be about my max range on the bean fields where I hunt. Gun is built on a model 7 action. I am thinking of scoping the rifle with a 3.5-10x40 CDS or 4.5-14x40 CDS. I am just wondering how crucial it would be to have parallax adjustment capability? Trying to decide on an AO or side focus option or just a standard one inch scope without parallax adjustment capabilities.
What feedback cann you give me?
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Campfire Outfitter
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For a LR hunting rifle, pick a different scope. Parallax adjustment isn't critical if you practice consistent cheek weld.
For 600 yards and in, I'd be happier with a SS 6x or 3-9x, or if you insist on light weight and 1" tube, a FX3 6x42.
I've seen some reliability quirkiness with Leups, including the 6x42, so if I was planning on cranking on the elevation turret I'd go SWFA SS, or if you want to step up the price and weight, the Bushnell LRHS 3-12. Both (multiple SS and a single LRHS) have shown me utter reliability.
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For a purpose-built LR rifle it makes little sense not to have it. Unfortunately, scopes built for turret-turning tend to be chubby. Seems sad to beef up the svelte Model 7 action, but for the $, all roads lead to the Chicken.
I do not entertain hypotheticals. The world itself is vexing enough. -- Col. Stonehill
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Campfire 'Bwana
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Campfire 'Bwana
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Parallax adjustment isn't critical if you practice consistent cheek weld. Keep in mind that when you're shooting from different positions, especially uphill, downhill, or sidehill, you can't always be consistent. The best way to see how much shift you'll get (how much difference it makes) with a given scope is to line up the crosshairs on the target using a rock solid rest and shift around to different positions and see if the crosshairs move.
A wise man is frequently humbled.
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Campfire Ranger
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Campfire Ranger
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Parallax adjustment isn't critical if you practice consistent cheek weld. Keep in mind that when you're shooting from different positions, especially uphill, downhill, or sidehill, you can't always be consistent. The best way to see how much shift you'll get (how much difference it makes) with a given scope is to line up the crosshairs on the target using a rock solid rest and shift around to different positions and see if the crosshairs move. I was thinking the same thing. I wouldn't have scope without parallax adjustment.
"Only Christ is the fullness of God's revelation."
Everyday Hunter
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Parallax error is minimized the farther away the image is. Fixed parallax set for 100 yards is going to show greater error from 100-400 yards than beyond 400. There's a reason most AP scopes have finer increments for shorter distance, and coarser increments for longer distance. They often go from 10 to 20 to 50 to 100, etc, and then from 400 or 500 yards straight to infinity.
Sure AP is nice, but as I said it's not critical. I've got plenty of scopes with AP, and plenty without. Fixed parallax hasn't stopped me from killing critters, rocks, and steel out to well beyond 1000 from various field positions. In fact, my longest shots on game were first-round, vital hits (my own kills, and cleaning up wounded animals for buds), and all were with 3-9x40/42 scopes with fixed parallax. It doesn't take more than a second to center your eye on the image when getting into position for a long shot, even if you aren't consistent in your cheek weld.
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Campfire 'Bwana
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Campfire 'Bwana
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Sure AP is nice, but as I said it's not critical. Agreed. It doesn't take more than a second to center your eye on the image when getting into position for a long shot, even if you aren't consistent in your cheek weld. True. If you're in a really awkward position, like with a rock under your crotch or cactus, it can make things more difficult but my main point to the OP was that if you really want to know how much it matters, set up the rifle in a solid rest and move your head around and see what happens with the crosshairs.
A wise man is frequently humbled.
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If you're shooting at a barn.....not much! On the other hand if it's a horsefly....a lot!
Even birds know not to land downwind!
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Campfire Kahuna
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Campfire Kahuna
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RatherBHuntin,
There isn't any parallax at any range IF your eye is perfectly centered behind the scope, even if the scope doesn't have any parallax adjustment.
You can also determine how much error parallax can produce with some simple math. Let's say you're using a scope with a 42mm (@ 1.65") objective lens, adjusted at the factory to be free of parallax at 150 yards. The maximum possible parallax error at any other range is directly proportional to the diameter of the objective lens.
As a simple example, let's say you're shooting with that scope at 300 yards. The maximum possible error due to parallax is 1.65", because that's how much error the objective lens allows in your eye placement behind the scope.
Each additional 150 yards past the parallax-free distance of 150 yards adds another "objective lens diameter" to the possible error. Since 600 yards is 450 yards past the parallax-free distance, and 450 yards is three times 150, the maximum possible parallax error at 450 is 1.65" X 3, or 4.95".
This seems like a lot, but possible error from the center of aim is half that, slightly less than 2.5". And most shooters, on most shots, don't have their eye as far as possible off-center behind the scope, so parallax error is likely to be less than 2.5" from point of aim at 600.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
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Campfire Ranger
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Campfire Ranger
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What is the typical 3-9X or 3 1/2-10X set for?
"Only Christ is the fullness of God's revelation."
Everyday Hunter
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Sure AP is nice, but as I said it's not critical. Agreed. It doesn't take more than a second to center your eye on the image when getting into position for a long shot, even if you aren't consistent in your cheek weld. True. If you're in a really awkward position, like with a rock under your crotch or cactus, it can make things more difficult but my main point to the OP was that if you really want to know how much it matters, set up the rifle in a solid rest and move your head around and see what happens with the crosshairs. Yup, and you're right. Some scopes have more parallax error than others...
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Campfire Outfitter
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If you're shooting at a barn.....not much! On the other hand if it's a horsefly....a lot! I'd assume we're talking BG, given the forum we're in and the OP.
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Joined: Jul 2001
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Campfire Kahuna
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Campfire Kahuna
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“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
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Joined: Apr 2010
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Campfire Outfitter
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If you're shooting at a barn.....not much! On the other hand if it's a horsefly....a lot! I'd assume we're talking BG, given the forum we're in and the OP. Don't assume!
Even birds know not to land downwind!
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Joined: Nov 2003
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Campfire Ranger
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Campfire Ranger
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"Only Christ is the fullness of God's revelation."
Everyday Hunter
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Joined: Mar 2006
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Campfire Outfitter
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If you're shooting at a barn.....not much! On the other hand if it's a horsefly....a lot! I'd assume we're talking BG, given the forum we're in and the OP. Don't assume! It's a safe assumption. The OP said it's a LR hunting rifle for bean fields. If he's hunting horseflies I'd be surprised...
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Campfire Tracker
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OP
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RatherBHuntin,
There isn't any parallax at any range IF your eye is perfectly centered behind the scope, even if the scope doesn't have any parallax adjustment.
You can also determine how much error parallax can produce with some simple math. Let's say you're using a scope with a 42mm (@ 1.65") objective lens, adjusted at the factory to be free of parallax at 150 yards. The maximum possible parallax error at any other range is directly proportional to the diameter of the objective lens.
As a simple example, let's say you're shooting with that scope at 300 yards. The maximum possible error due to parallax is 1.65", because that's how much error the objective lens allows in your eye placement behind the scope.
Each additional 150 yards past the parallax-free distance of 150 yards adds another "objective lens diameter" to the possible error. Since 600 yards is 450 yards past the parallax-free distance, and 450 yards is three times 150, the maximum possible parallax error at 450 is 1.65" X 3, or 4.95".
This seems like a lot, but possible error from the center of aim is half that, slightly less than 2.5". And most shooters, on most shots, don't have their eye as far as possible off-center behind the scope, so parallax error is likely to be less than 2.5" from point of aim at 600. Thanks MD. This helps me put things in perspective. Just trying to settle on a scope for my 6.5 SAUM. I have a Zeiss 6.5-20x50 on there now, but it just looks way too big for the model seven and I am afraid it will too easily get knocked off zero with the small distance between rings.
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Campfire Ranger
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Campfire Ranger
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I am thinking of scoping the rifle with a 3.5-10x40 CDS or 4.5-14x40 CDS. I am just wondering how crucial it would be to have parallax adjustment capability? Trying to decide on an AO or side focus option or just a standard one inch scope without parallax adjustment capabilities.
What feedback can you give me? As power goes up, the lack of PA becomes more apparent at further distances. As said, being centered behind the scope helps mitigate potential issues. Another option I've done on fixed scopes, is to reset the parallax to 400 yards and not fret the closer range stuff. Easily done yourself w/o shipping the scope to Leupold and paying their $25.00 fee. There's a couple threads here on how to do it.
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OP
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I thought about doing the same thing.
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Campfire Regular
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I've not tried it but have heard that some highpower Service Rifle competitors are drilling a centered hole in a cover for the ocular end of the scope. Supposedly looking through the hole in the cover centers your eye behind the scope. In highpower we shoot standing, sitting, and prone at 200, 300, and 600 yards and it is not easy to get centered behind the scope with a fixed A2 butt assembly. I have no idea how this works or if it is feasible for a hunting rifle, but it does appear to reduce the parallax error.
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