Thread: Scope alignment methods

I've recently purchased a new scope for my Howa 1500, and have run into the familiar problem of knowing how best to align the scope to the bore to minimise scope cant.

Every time I do this, I end up stuck in an obsessive vortex (excuse the pun) about whether the scope is properly aligned to the rifle. Part of the problem is the action doesn't seem to sit perfectly vertical in the stock, and the rings/bases don't appear perfectly aligned with the action either. So using the scope bases as a horizontal reference has resulted in what looks to be a wonky alignment.

In this case, I ended up taking the action out of the stock and using the flat base of the Howa action as my reference, then aligned the crosshair to a vertical reference - it looks ok, but still feels like it is canted one way.

Probably the easiest (or simplest) answer is to stop obsessing - but it got me curious about what other people's methods are, especially when there isn't an obvious flat reference on the top of the action?

Wheeler scope levelling tool. Probably not necessary for the kind of shooting I do, but it stops the second guessing. You do need a flat section on the action though.

Originally Posted by MB

Wheeler scope levelling tool. Probably not necessary for the kind of shooting I do, but it stops the second guessing. You do need a flat section on the action though.

Yes - I should have mentioned I have a similar scope leveling tool - I think it's just the consistent reference is where I'm coming unstuck.

I use the flat base of the action out of the wood - make sure the bench is true using a spirit level - then hang a plumb bob and that is my vertical - how old are you it could be your eyesight if you are using same method and not seeing it as true ( no really )

I made one of these: https://www.brownells.com/optics/rin...le-instrument/

Darn good - no flat surfaces on scope or rifle required. Use the bubble to true the level of the assembled rifle/scope, then rotate the scope in the rings to match a vertical reference. I use a weighted string hanging off the washing line for that.

Originally Posted by PaulNZ

I made one of these: https://www.brownells.com/optics/rin...le-instrument/

Darn good - no flat surfaces on scope or rifle required. Use the bubble to true the level of the assembled rifle/scope, then rotate the scope in the rings to match a vertical reference. I use a weighted string hanging off the washing line for that.

+1 The only correct method to set up a scope. Centres the scope vertical retical thru bore centre. Most other methods are good enough though for hunting rifles. Dialling up at long range will show up inaccuracies of mounting.

I too made one but eventually bought the Brownells version.

Once the scope is mounted I've also gone to bore sighting using a strong torch thru the ocular lens projected onto a plumb bob string line. With this method I can bore sight very accurately in the length of my gun room. I can also do the vertical travel check, winding the cross hair up and down the string.

Originally Posted by zimmer

+1 The only correct method to set up a scope. Centres the scope vertival retical thru bore centre. Most other methods are good enough though for hunting rifles. Dialling up at long range will show up inaccuracies of mounting.

I too made one but eventually bought the Brownells version.

Once the scope is mounted I've also gone to bore sighting using a strong torch thru the ocular lens projected onto a plumb bob string line. With this method I can bore sight very accurately in the length of my gun room. I can also do the vertical travel check, winding the cross hair up and down the string.

This method @PaulNZ looks interesting - I'm not quite following how it works?

Originally Posted by earplay

This method @PaulNZ looks interesting - I'm not quite following how it works?

The small vee on the long piece of the jig is placed on the barrel just in front of the scope objective - being a vee it self-centres. Loosen the lock nut and bring the larger vee down to contact the outside of the scope objective. Now your jig is located exactly on the line between barrel centre and the scope centre. This line is probably not true vertical (yet), so move the rifle on whatever rest or clamp you're using until the bubble is centred. Your scope/rifle assembly is now true vertical, so you can rotate the scope (without moving the rifle) until the crosshairs match another true vertical reference - like a plumb bob.

If your question is instead about bore sighting with a torch through the ocular lens, I'll leave @zimmer to explain that one further. Sounds like something I need to try though.

Originally Posted by PaulNZ

The small vee on the long piece of the jig is placed on the barrel just in front of the scope objective - being a vee it self-centres. Loosen the lock nut and bring the larger vee down to contact the outside of the scope objective. Now your jig is located exactly on the line between barrel centre and the scope centre. This line is probably not true vertical (yet), so move the rifle on whatever rest or clamp you're using until the bubble is centred. Your scope/rifle assembly is now true vertical, so you can rotate the scope (without moving the rifle) until the crosshairs match another true vertical reference - like a plumb bob.

If your question is instead about bore sighting with a torch through the ocular lens, I'll leave @zimmer to explain that one further. Sounds like something I need to try though.

Ok I think I get, cheers. Some great knowledge on the forum, and few new ideas try!

https://youtu.be/OG8CchRYlDw?si=kpBpjOcU--nB43uW

Check this out it explains a lot

Sent from my CPH2531 using Tapatalk

Wow, a simple method is to put the butt on the ground, floor etc and then tilt the rifle back, hold the barrel tip by fingers very lightly, look into your scope and any deviation becomes obvious.

On this subject, it's amazing how much the scope can rotate when tightening scope screws, so tighten them evenly and keep an eye on it.

I use this.

https://www.wheelertools.com/scope-m...B8JVU_PeYpJOqI

But the video 25/08 IMP posted the link to touches on a key point about turrets not always being level. Plus the presenter isn't a fan of a plumb bob.

Originally Posted by earplay

I've recently purchased a new scope for my Howa 1500, and have run into the familiar problem of knowing how best to align the scope to the bore to minimise scope cant.

Every time I do this, I end up stuck in an obsessive vortex (excuse the pun) about whether the scope is properly aligned to the rifle. Part of the problem is the action doesn't seem to sit perfectly vertical in the stock, and the rings/bases don't appear perfectly aligned with the action either. So using the scope bases as a horizontal reference has resulted in what looks to be a wonky alignment.

In this case, I ended up taking the action out of the stock and using the flat base of the Howa action as my reference, then aligned the crosshair to a vertical reference - it looks ok, but still feels like it is canted one way.

Probably the easiest (or simplest) answer is to stop obsessing - but it got me curious about what other people's methods are, especially when there isn't an obvious flat reference on the top of the action?

You don't necessarily want the scope perfectly level when the rifle is levelled on a bench, as when you shoulder the rifle chances are you can't the rifle a little one way or the other.

The easiest way to see if the scope is level is to hang a plumbob and look at it through the scope as you shoulder the rifle.
Make sure you do this a few times and try not look through the scope as you line up on the plumbob string otherwise you'll inadvertently cant the rifle to line up on the string.

There will likely be a small amount of cant between the scope and rifle but it won't matter 99.9% of the time.
If you don't adjust it to you, then you'll either always have the scope canted (probably not the end of the world for most hunters anyway but you'll keep 2nd guessing) or you'll be fighting your bubble level (if you have one).

If you have a chassis/stock with an adjustable cant butt pad, they yes try get the scope level on the rifle first and adjust the buttpad to suit you.

I clip a bubble level each side of pic rail under scope.Bore sight to a plum line about 6 mtrs away.With pic rail level i rotate scope to vertical on plume line.Checking bubbles are good or very close and bore sight perfect to plum line.Just quietly rotate slowly tighning up each scope ring screw a little bit at a time.
Keep checking bubbles and plum line n bore sight as you go.