Thread: FINALLY got my LR come ups

Its taken me years to find the time to suss this out. My 6.5x55 is so small at beyond 1km you can hardly hear or see it strike. Been in a few shoots - done REALLY badly but hopefully things will pick up now. I had to tweek my 'Applied Ballistics' app but I managed to hone it to within 1-0.5 of what I reckon I was hitting.

Anyone else struggling to find their correct ballistic curve for medium to LR?

Couple of questions for you...

Have you been using G1 or G7 BC ?

What projectile and what BC value ?

Have you confirmed your scope clicks by shooting a tall target test ?

Shooting to check click values is a pointless and wasteful excercise. Don't do it.

You should definitely check your click values, just do it properly.

Originally Posted by Proudkiwi

Shooting to check click values is a pointless and wasteful excercise. Don't do it.

You should definitely check your click values, just do it properly.

How ?

Originally Posted by sAsLEX

How ?

Make up a target with 1" grid lines, ideally 20" total but 10" is the minimum. Clamp the rifle with the cross hairs precisely on the top mark. Wind 10 MOA into your scope and see how far the cross hairs have actually moved. 10 MOA equals 10.47 inches at 100 yds. 20 MOAwill be nearly 21 inches at 100 yds.

Originally Posted by stug

Make up a target with 1" grid lines, ideally 20" total but 10" is the minimum. Clamp the rifle with the cross hairs precisely on the top mark. Wind 10 MOA into your scope and see how far the cross hairs have actually moved. 10 MOA equals 10.47 inches at 100 yds. 20 MOAwill be nearly 21 inches at 100 yds.

Lets go right of tangent here and ask who has done this?

Originally Posted by Proudkiwi

Shooting to check click values is a pointless and wasteful excercise. Don't do it.

You should definitely check your click values, just do it properly.

Useful post.....

Care to share, or are you just leaving it there ?

I use tall target for 2 things. One to check cant / scope level. Two to see the real value of clicks - contrary to popular belief most scope manufacturers don't have the tolerances their marketing department would have you believe.

If you're interested in doing some reading : Applied Ballistics by Brian Litz, chapter 9

Originally Posted by ebf

Useful post.....

Care to share, or are you just leaving it there ?

I use tall target for 2 things. One to check cant / scope level. Two to see the real value of clicks - contrary to popular belief most scope manufacturers don't have the tolerances their marketing department would have you believe.

If you're interested in doing some reading : Applied Ballistics by Brian Litz, chapter 9

I bought the ebook copy of Bryan's famous book. All the snipers hide disciples have me convinced I shouldn't be tinkering with BC so i looked at my scope which is a March. To be fair I'd seen similar range data from 2 of my cheapy scopes so I've come to the conclusion that you are totally right (clicks not being exactly what manufacturers say)

I did a micro ladder test (no firing, just using pins in a board and lining up my crosshairs) and then scaled up my results to true Mil distance (100m) using AutoCAD. I got scarey close using only 8.6m as my base distance and a laser measurer.

Question - what is the best distance (if you can scale any results accurately using CAD) to your test target for your scope test?
The pro's of setting up close - you can see and measure the Rise really well, it takes 10mins it your backyard too.
The cons of setting up close - any error from measuring estimated reticule out to target will be magnified massively. For me i must have been bang on to only get 1.76% error over all

I reckon the full 100m is probably best if you have the magification and space

In short - I believe that the elevation adjustment feature in 'Applied Ballistics' is more about tuning your own body's relationship with the recoil of your rifle. It may not be the scope which has untrue clicks - just that your mass + shooting style is causing more muzzle flip than the next guy. Hell, it could be that the clicks are actually off but mine was only 0.08 to fully bring my proven FOS into line.

Originally Posted by ebf

Couple of questions for you...

Have you been using G1 or G7 BC ?

What projectile and what BC value ?

Have you confirmed your scope clicks by shooting a tall target test ?

I tested the shit out of the software, tinkering with everything. BUT this time i had the knowledge that my 6.5x55 T3, using 140g Amax was truely doing 2723ft/sec average. I had the good luck of being able to use a very expensive chrony set up by 2 gunsmiths, in absolutely perfect weather! They measured my case head expansion and found my load to be extremely mild with next to no expansion after 5 firings. I'm lucky to know these fellas eh. They suffer me with the patience of saints

So, with confidence I believe I'm using G7 (on their advice) which comes with a default bc of .299. The G1 bc is 0.584 (litz) and this was pretty close to my field tests too. G7 was only marginally better and apparently it really helps the .338 guys out at the 1.5km mark. My rounds go crap-sonic at 1100m so 1025 would be about my max accurate distance.

At longer ranges with a fairly wind affected chambering I also have found it difficult to be sure bc and velocity are on.
They are, you just need near windless conditions to prove it to yourself.

Have done.

Sent from my GT-I8160L using Tapatalk

I just go the the pointless and wasteful exercise of firing 2 shots...

Very easy to measure edge of hole to edge of hole, but hey, that's just me...

Originally Posted by ebf

I just go the the pointless and wasteful exercise of firing 2 shots...

Very easy to measure edge of hole to edge of hole, but hey, that's just me...

Hmm we will leave you with that one
You do realise it takes no shots and a spirt level two make sure you have no scope cant?

Unfortunately @ ebf I'm not a good enough shot to do it that way I'd end up blaming the scope for my own errors

Originally Posted by ebf

I just go the the pointless and wasteful exercise of firing 2 shots...

Very easy to measure edge of hole to edge of hole, but hey, that's just me...

But I like shooting, and firing more shots is good for my soul Brads, pls don't make me shoot less

I level the target...