I recently bought 4 100ct boxes of 215s and just received them. The labeling on these boxes is different than my others. These boxes show a BC of .696 and a twist rate of 1-10 vs my other boxes showing a BC of .691 and a twist rate of 1-9. My question is are there any real differences in the bullets? Should I expect to see different results? Thanks for any info
Berger 215 Hybrid confusion
- Thread starter AZjake
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Same bullets. Berger just refined the numbers.
Berger Bullets Twist Rate Recommendations by Eric Stecker & Bryan Litz | Berger Bullets
Berger Bullets Twist Rate Recommendations by Eric Stecker & Bryan Litz | Berger Bullets
Broz
Well-Known Member
They are the same bullets. They will shoot the same. If you run the numbers between .696 and .691 G 1 BC, you will see it is a minute change that many would not even be able to detect.
Jeff
DocUSMCRetired
Well-Known Member
This is old but I am going to copy paste it in:
"Why do we have a need to revise the BC of bullets from time to time?
There is a bit of miss-information going around lately. More of a miss-understanding of what is going on when a bullet gets updated in the library. There are a couple of things to understand about how bullets are produced, which explains why bullets require their BC data to be updated from time to time:
1) Machine Setup: Companies only have a certain number of machines to produce bullets on. When they want to produce a new line of bullets, they must then swap out the tooling/dies/equipment on that machine for the next bullet. The process of doing this requires that the operators take special care to setup the machine for repeatability every time a production run is made. This can lead to small variances in BC from lot to lot as it is extremely difficult to produce 0.01% accuracy from setup to setup.
2) Tooling/Dies wear out. When you produce millions of bullets with a set of dies, you are going to have wear. This wear can lead to slight lot to lot variations in BC of bullets. Eventually you will need to make a new set of dies for that bullet, which can lead to a noticeable change in BC by the users. For this reason it is important to re-test bullets from time to time.
Quality control. The level at which a company decides to manage the two factors above will control the level of consistency you get from different lots of bullets.
3) Now that you know what can cause variations lot to lot, you know why you sometimes see that we have to update the BC on a bullet. This has nothing to do with the quality of the data, or the previous data. It has to do with changes in the product over time. Fortunately, our lab is constantly checking and re-checking bullets. We are not re-firing the old bullets we keep in catalog. We are firing new lots of the bullets in the library to make sure what is on the market now, matches up with the data we had in the library before. If we find enough variation in that data, then we publish a revision on that bullet. In the next edition of Ballistic Performance Of Rifle Bullets, and the current, you will find the lot numbers associated with the bullets data so you can track how far you are from the test batch. You are not seeing "corrections" to the data, as has been mistakenly thought in the past. You are seeing updated information, associated with the change in a manufacturers product. "
"Why do we have a need to revise the BC of bullets from time to time?
There is a bit of miss-information going around lately. More of a miss-understanding of what is going on when a bullet gets updated in the library. There are a couple of things to understand about how bullets are produced, which explains why bullets require their BC data to be updated from time to time:
1) Machine Setup: Companies only have a certain number of machines to produce bullets on. When they want to produce a new line of bullets, they must then swap out the tooling/dies/equipment on that machine for the next bullet. The process of doing this requires that the operators take special care to setup the machine for repeatability every time a production run is made. This can lead to small variances in BC from lot to lot as it is extremely difficult to produce 0.01% accuracy from setup to setup.
2) Tooling/Dies wear out. When you produce millions of bullets with a set of dies, you are going to have wear. This wear can lead to slight lot to lot variations in BC of bullets. Eventually you will need to make a new set of dies for that bullet, which can lead to a noticeable change in BC by the users. For this reason it is important to re-test bullets from time to time.
Quality control. The level at which a company decides to manage the two factors above will control the level of consistency you get from different lots of bullets.
3) Now that you know what can cause variations lot to lot, you know why you sometimes see that we have to update the BC on a bullet. This has nothing to do with the quality of the data, or the previous data. It has to do with changes in the product over time. Fortunately, our lab is constantly checking and re-checking bullets. We are not re-firing the old bullets we keep in catalog. We are firing new lots of the bullets in the library to make sure what is on the market now, matches up with the data we had in the library before. If we find enough variation in that data, then we publish a revision on that bullet. In the next edition of Ballistic Performance Of Rifle Bullets, and the current, you will find the lot numbers associated with the bullets data so you can track how far you are from the test batch. You are not seeing "corrections" to the data, as has been mistakenly thought in the past. You are seeing updated information, associated with the change in a manufacturers product. "
