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I assume this is what you purchase to measure groups ?

Those will be nice if you ever start reloading( to measure oal and neck/ rim expansion), but a bit overkill to measure groups.

Use this to measure groups. Just take pics with your phone and then measure on your pc. Also a good way to record your groups with various ammo, temp, etc

On Target Precision Calculator
 
Those will be nice if you ever start reloading( to measure oal and neck/ rim expansion), but a bit overkill to measure groups.

Use this to measure groups. Just take pics with your phone and then measure on your pc. Also a good way to record your groups with various ammo, temp, etc

On Target Precision Calculator


I've been using this software for a while, and is fantastic. I just save the image with all of the data on it, and store them in my log books for each of my rifles.
 
If you get a pair of calipers, I'd recommend Mitutoyo calipers. Best in the business in my opinion. They've held within tolerance (+/- 0.001) and I check them against gauge blocks monthly in my machine shop. Best part about them is that they maintain their zero when they turn off, so you don't have to re-zero them every time.

McMaster-Carr
 
If you get a pair of calipers, I'd recommend Mitutoyo calipers. Best in the business in my opinion. They've held within tolerance (+/- 0.001) and I check them against gauge blocks monthly in my machine shop. Best part about them is that they maintain their zero when they turn off, so you don't have to re-zero them every time.

McMaster-Carr

My $6 set of Harbor Freight calipers maintain .001", checked against a Brown and Sharpe .0001" Micrometer. Although I sometimes have to push the "Zero" button when I turn it on. Sure I would rather have Mitutoyo calipers, but I don't think it's necessary for reloading.
 
Remember before you post online any group that you shot. Subtract half an MOA out to 500 yards and 1 MOA between 500 and 1000 yds. (Joking)

It really depends how technical you want to get with it. If you are shooting a factory gun and factory ammo, a cheaper caliper like "Temp9" above recommended will be totally fine. Or even a ruler. If you are going to work loads, then you want something a bit better. If you have a custom set up and handloads then the Target Precision Calculator is nice. Especially to see change over time.

Unless you are punching 1 hole groups, ie 100 yards benchrest stuff, where you are tweaking your loads in your trailer up or down by clicks on your powder based on barometric pressure and temp, I wouldn't spend $100 on a set of calipers. I would save the funds, get some neck turning equipment or spend the money on better bullets, dies etc. I have shot the benchrest game and while it can be entertaining its a lot of time and money. Calipers never got guys into the prizes (well they did if it measured their tiny group). What it came down to was good dies, brass, bullets etc.
 
a set of dial calipers don't require batteries.

That software is great but it doesn't appear that it can be used with a cell phone. Calipers, I can measure at the range.
 
What's wrong with one of these?
ruler.jpg

no batteries, fits in your pocket/bag/wallet maybe? we really only need a 2" ruler out to 1000 yards anyway right?

Sadly, if you google "ruler" you'll see someone has asked "how do I read a ruler?"
they live among us & they vote...
 
Yep I use of elevation for realoding I have 3of them

Sent from my SCH-I535 using Tapatalk 2
 
Just think of how dumb the average person is, then realize half of the population is even dumber!
 
The ruler will work. General something or another; I have one, got at hardware store. Probably cost more than the $6 harbor freight digital caliper...
Dial caliper works good for all-around use, but for $6....


BTW, Starrett trumps Mitutoyo everytime, just costs 2x or 3x the money.