Vice nice group Stag1933.
What was it like at 200 and 300yds ???
What were the chrono readings and ES and SD ???
I personally like to test loads at 200-300yds and run them over a chrono because I found that some loads that were really good at 100yds were pants at 200 and beyond. I get similar groups to yours above at 200 and 250 yds with 80grain bergers, but at 100yds it
Figure that one out ???
....What were the chrono readings and ES and SD ??? .........
robbosam. Here's an interesting article on ES and SD.
The Rifleman's Journal: Ballistics: Statistics for Rifle Shooters
It's conclusion on ES is as follows:
• ES is not a reliable statistical indicator
• The best indicator of velocity variations is the standard deviation.
• Most figures we read and hear about with respect to SD and ES have very little meaning…
Rgds JCS
Robbobsam, i find my .223 with home loaded 40gn BTs in it groups at 0.3 MOA all day long. Ive chronoed a fair few rounds and the ES is massive.. like 200fps different.. BUT the rifle still groups exceedingly well.. even at 200 or 300 yds. It seems that ES makes very little difference.
On the other hand, i had a rifle which the ES was 20-30fps and wouldnt group better than MOA.
I use the chrono to get a MEAN velocity for the calculator but thats it.
Im all with you on consistency throughout the process but my findings from the chrono show that there is no set correlation between ES and grouping.
This was THE 10 shots through the chrono, 5 @ 100 and 5 @ 300.
To clarify, i dont shoot 0.3 all the time, sorry, but the rifle is well capable of it. Im seeing 1'' groups at 300yds on a good day ie no wind, me not having the shakes etc! On a bad day at 300yds im seeing 2-3'' groups which is obviously closer to MOA, but if the rifle will shoot sub 0.5 at 300 the the ammo on the right day with the ES of 200fps then it proves that ES isnt everything.
1: 3492
2: 3528
3:3460
4:3533
5:3471
6: 3654
7: 3541
8: 3618
9: 3478
10: 3601
On a note, what i did see is that certain powders give better continuity RE speed. in the .223 i tried H4895 which is very uniform with velocity opposed to the H335 which gave me the above results.
As I said above, with the chrono readings you quote above 300yd 0.3moa is just not possible, alternatively the chrono is inaccurate.
Personally I think its your chrono.
You cannot argue with the laws of physics.
Hi Robbosam and Flyingfisherman
You have totally lost me i aim my rifle at deer/fox /rabbit him fall down =good shot, him not fall down=bad shot, him fall down get back up=good boy go find
Geordie
I know where you are coming from with that!,........ He's laying on the .223, I'm picking up the bunnies with the Geovids,........ I made my call on the wind, he alters his p.o.a............. dead bunny! 450yards head shot.Up to 300yds it doesn't really make much difference.
I am always open to debate on a topic.......
View attachment 3812
robbosam. All ES tells you is the difference between the fasted and slowest velocity. It tells you nothing about the distribution of the intermediate velocities. Just because it's easy to measure doesn't mean that it is useful. The Standard Deviation is a much more useful number. The article is well worth reading again.
With my own loads I am aiming to get an SD of 10 or less.
Rgds JCS