New Berger hybrid lot varation. Need some help with this please.

[dieselgeek]

Here is my OLD LOT. I've shot about 1000 of these though my .260

Here is the measurement ( I don't have 2 ogive tools) from the base to the ogive. .713 is the length.

Here is the NEW lot of Bergers.
As you can see the measurement is .701 I did this with 5 from each, they are all pretty much the same.

OLD LOT here, in my die that I've not really adjusted in a while. That's where my bergers seem to like to be seated.

NEW LOT. I loaded this right after I loaded the old lot, and I did not move the die.

So, is that not odd? they are the same measurement. I guess because I measured from the bottom of the bullet? Should I try measuring them from opposite side?

Would this mean I need to load them further out , or set them further back to get the same distance from the lands? I've got the tool to measure from the lands, but I'm using a 7-08 case as the .260s seems to be hard to find. I had to "fix" it to work, and it's hard to get a consistent measurement from that.

In the mean time, I loaded 10 like they are below, and 10 shorter/longer. Figure I can just see if they will shoot. At .42c a pill plus components, I'd really rather not spend all day reworking a load each time I get a new lot of bullets.

Thanks

 

[bodywerks]

That is odd and i totally agree that its getting expensive nowadays and you shouldn't have to spend half your box of bullets reworking a load. Let us know if they shoot the same. My guess is you won't notice much difference at 100 yards on a target, though. You're gonna have to chrony them and see how their trajectory is at like 600 yards to see if you can expect the same performance out of them as your old lot.

 

[dieselgeek]

That is odd and i totally agree that its getting expensive nowadays and you shouldn't have to spend half your box of bullets reworking a load. Let us know if they shoot the same. My guess is you won't notice much difference at 100 yards on a target, though. You're gonna have to chrony them and see how their trajectory is at like 600 yards to see if you can expect the same performance out of them as your old lot.

Yeah, I'm going to take them out and shoot them at 300 yards this afternoon. If they shoot, they shoot.

 

[Rthur]

I have seen this with the 6.5 130vld. In the last three lots they have been as much as .020ish different. This was also measured from base to ogive. I haven't noticed any difference in their performance though.

R

 

[RyeDaddy]

168 Hybrids were like this for my 308, just went through this 2 weeks ago. Same as yours, new bullet was shorter overall. Nose was same but bearing surface on the new lot was shorter. I didn't change the seater die and went and shot them, didn't shoot as well as the old lot, and velocity was lower. On a hunch I bumped the powder 0.1 grains at a time and checked. took 0.3 grains more Varget to get the same velocity, and when velocity was the same as the old lot the groups went back to normal(small). Never changed seating depth.

This is frustrating for such an expensive bullet.

 

[tobedell]

Must be when they tool back up for a production run. The 230gn .308's I used last year had to be bought in quantity to get all the same lot #'s for consistency.

 

[AZ.noob]

Just to add to the conversation..
I recently measured/sorted about 500 Sierra Matchkings for bearing surface length (with two ogive tools), and 99% of them were within .006
Such a small spread, I still sorted them in three lots and will chrono. I'm curious as to how much (if any) that small a spread affects ES & SD. I suspect not much, as I'm shooting factory (non-custom) equipment. Even still, I'll post results