Bring my Ogive concerns up to date-Case 2

[Bob Collins]

Bring my Ogive concerns up to date – Case 2
I put my actual measurement down, but this is just a relative number – it is not exactly the distance from the ogive to the front of the brass rim, but I can relate to the gun and ammo Lot as to chambering and how well the gun shoots the different lengths. .1690-95 is what I shot is the Triple Crown and IR 50/50 Nationals, it shot well, but I had three shot fall out, but it was right in the middle of the production run with the highest number of rounds in the bell shaped curve. I got another case and the bell shaped curve changed to .1660-65 or around 3 thousand (.003) difference from the first case I got back in April.
I shot the .1690-95’s at the IR 50/50 Nationals in my Hall and did pretty well with them – wish I had more of that size. I had one fall out and one my fault, but won two targets, 10.5# Yards 250-20X) and 13.5# Meters (250-17X), 1st in Yards 2 Gun 500-34X, and 3rd in the 4 Gun – sorting helped.
September 22, 2015


1. 1 at.1620
2. 3 at .1625
3. 47 at .1630-35
4. 185 at .1640-45 May 2015
5. 652 at .1650-55 12 at .1650
6. 692 at .1660-65 48 at .1660
7. 469 at .1670-75 200 at .1670
8. 402 at .1680-85 490 at.1680
9. 241 at .1690-95 879 at .1690
10. 116 at .1700-05 728 at .1700
11. 16 at .1710-15 246 at .1710
12. 8 at .1720-25 46 at .1720
13. 1 at .1730 3 at .1730
Total 2,833 or 56.66
or 63 boxes for Wallace
The first three and the last three are going into two boxes for warmers.

The first sort had 2,652 bullets with nine divisions; the second had thirteen divisions with 2,833 bullets.
The difference from one case to another of the same Lot number is striking, and they do not shoot the same. When I shot the .1660 at the GA State I had to go out 16 clicks on the turner from where I was shooting the .1690 back in June – and did not do as well. Go figure that one out. I would like to know how many cases were made of 2157 and it would be nice to know the cases by number. For example did I get the sixth case in May and the second case in June.
That gives everyone something to think about when ordering more than one case at a time and what case did you test Lots come out of when you purchased.
I have more data to send Phil and he has given me some very good comments on what he has been working on to reduce the variations in the ogive length. Just think if we only had 3 lengths to deal with instead of 5 to 13, I know our targets would be better, scores higher, and no wasted bullets.
Things are looking up.
Bob Collins

 

[Pete Wass]

I have been measuring mine

for a couple or three years now. I think what I see is the difference in length translates into the bullets striking the target in a slightly different place. I segregate mine by the .001". What I am really looking for is the real long ones and the real short ones. I believe they will for sure give problems such as droppers and flyers.

That said, the lot of ammo has to first shoot well in the rifle. I don't try to tune in ammo that does not shoot well with the tuner setting I have established. Perhaps that could use some looking into. Beyond that, I wonder if the engraving chambers may be our enemy. I think there may be a better chamber out there that might forgive some of these problems.

Pete

 

[tim]

Any thoughts as to whether most of it is a componant varience? Mostly case, or slug, or both? Do we have reason to believe some of it is varience in crimp?

 

[Pete Wass]

I think it's mostly crimp

Any thoughts as to whether most of it is a componant varience? Mostly case, or slug, or both? Do we have reason to believe some of it is varience in crimp?

the long ones are clearly noticeable as being out of position. I suppose there could be some variances in the length of bullets and probably is.

Pete

 

[tim]

the long ones are clearly noticeable as being out of position. I suppose there could be some variances in the length of bullets and probably is.

Pete

The question was directed at the OP.