My rifle shoots 1/2" groups @100 yards all day! Really? Prove it.
- Thread starter Underthegun
- Start date
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
congrats UTG.
Jerry
Jerry
If your one shot groups were 1/2 moa I would look into some warranty work on that rifle, I get a little bullet wobble with my savage axis rifles but my 1 shot groups stay under 0.005 MOA............maybe your flinching under the heavy recoil.................
Just a thought. If the bullet doesn't hit the target perfectly straight, wouldn't it result in a hole bigger than the diameter of the bullet? If this happens and we subtract the diameter of the bullet from the edge to edge measurement, the resulting number would be slightly larger than otherwise. What I've seen before is a test shot somewhere on the same target and use that measurement to subtract from the groups to get CTC. Just a thought.
Regardless of what size of hole your bullets makes in the paper relative to its caliber it makes no difference to how your group is measured. It is what it is. Just make sure your bullets are stabilized. If they are not then you need to revisit your load or rethink what ammo you are using.
porterhouse
Regular
- Location
- Lower Mainland
if your bullets are keyholeing, will you even make it close enough to a .5 inch group for it to matter?
Let me explain in more detail.
The way that things are measured now (if my understanding is correct):
5 shot group edge to edge measurement (let's say it winds up to be 1'")
subtract bullet diameter (let's say it's .223')
Our center to center group size is 1' - 0.223 = 0.777'
Now, let's say that the rifle barrel and target are perfectly perpendicular. This method of calculation would work.
Next, let's look at what happens if the target is horribly placed. For arguments sake, let's say it's placed at a 45 degree angle relative to the barrel. Now when the holes in the target would no longer be circle, but oval. Now let's say each of the oval holes measures .350" from left to right, with a total of group edge to edge of 1.127".
If we try to find the CTC, we take 1.127" - 0.223" = 0.904"
However, the 0.223" we subtracted does not indicated the average bullet hole size, but the actual diameter of the bullet.
If we took another single shot on the target and the hole measured 0.350", we wind up with:
1.127" - 0.350" = 0.777"
So in fact, the second group and the first group are identical in regards to consistency of the shooter. The only difference was if the target was perfectly aligned to face the shooter.
Now, there's no way anyone is going to setup a target at such an extreme angle, but even if it's 10 degrees off, the size of the holes would be larger. (Think of poking a hole in a piece of paper straight on versus poking it at a slant - the size and shape of the hole would be different).
Anyways, I'm sure it won't make a much of a difference in the final measurement. It's just some food for thought.
The way that things are measured now (if my understanding is correct):
5 shot group edge to edge measurement (let's say it winds up to be 1'")
subtract bullet diameter (let's say it's .223')
Our center to center group size is 1' - 0.223 = 0.777'
Now, let's say that the rifle barrel and target are perfectly perpendicular. This method of calculation would work.
Next, let's look at what happens if the target is horribly placed. For arguments sake, let's say it's placed at a 45 degree angle relative to the barrel. Now when the holes in the target would no longer be circle, but oval. Now let's say each of the oval holes measures .350" from left to right, with a total of group edge to edge of 1.127".
If we try to find the CTC, we take 1.127" - 0.223" = 0.904"
However, the 0.223" we subtracted does not indicated the average bullet hole size, but the actual diameter of the bullet.
If we took another single shot on the target and the hole measured 0.350", we wind up with:
1.127" - 0.350" = 0.777"
So in fact, the second group and the first group are identical in regards to consistency of the shooter. The only difference was if the target was perfectly aligned to face the shooter.
Now, there's no way anyone is going to setup a target at such an extreme angle, but even if it's 10 degrees off, the size of the holes would be larger. (Think of poking a hole in a piece of paper straight on versus poking it at a slant - the size and shape of the hole would be different).
Anyways, I'm sure it won't make a much of a difference in the final measurement. It's just some food for thought.
I think everyone understands what you are saying. You make a good point BUT it's pointless to discuss it because bullet hole shape will never be considered when measuring a group in the real world. I had a savage that key holed badly. Bullets would impact nearly broadside. Strangely enough the rifle would still stack the key holed shots on top of one another. Turned out to be bad rifling.
Has anyone completed this challenge with any magnum chambered 30 cal plus yet? I think I may give it a go with my 300rum and the 210 Bergers, it's a little bit of an expensive challenge If I don't get it on the first try though.......
All the successful attempts along with the rifle and caliber used are in the original post. But no, nobody has posted an attempt with anything bigger than a 308 that I recall. Please post your results no matter what happens. It would be nice to see an attempt from a magnum.
