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Me too and I agree. If he has been a Nosler fan since '65, and is on that web site, .....why isnt he on here?Wally":3inynwpn said:I've reread the post several times. His test method seems to be lacking.........
Just my $.02,
Steve
JusMo":1mubekv4 said:I think everyone here understands that Nosler 2nds are cosmetic blemishes only. If there are any weight tolerances out of spec then it was a mistake and we will make it good with the customer. Excellence, integrity, and service; those are three things that will never be compromised here. The only thing that anyone needs to do if they ever find a problem is to call us and we will take care of you. That's the way it has been since day one at Nosler and that's why a lot us, including myself, work here. I don't have an account over at the Cabelas website so if someone could please pass along this message it would be very much appreciated. Thanks guys. :grin:
JusMo":2szu6sn5 said:Thanks Rich.
It was also very nice to meet you in Salt Lake City. We'll be back at that show again next year in full force, make sure to mark it on your calendar and let us know if you can make it.
-Justin
Wow., I would like to get the sampling data. What your background? Are in you QA? The other question that I have is what other bullets have you tested?Oldtrader3":27noq7ur said:Thank you for the welcome to your forum. I joined a while ago but serious health issues have kept me away until now. Below is some findings and conclusions, kind of summarized from the posts on the Cabaela's forum. I believe thaat they are self explanatory. Thank you for your time.
When I bought (4) bags of Nosler seconds, I expected blemishes and jacket discoloration. I did not expect the scale of process variation that I found without looking too hard. I have fired these bullets in two different rifles, a Mark V Weatherby .340 WM (1+ inch groups) and a Sako .338 Federal, which shoots 3/4 inch groups (what you would expect from a Sako). However, not with these Partitions! These bullets have never shot under 2+ inches in this accurate rifle with (3) different load development projects each and (6) different powders total.
That was what made me weigh the Partitions in the first place. I have not checked these bullets for diametral variation yet, but will. So after two rifles load developments and (6) powders tested in the (2) .338 calibers. I have fired about (100) Partitions Seconds in 210 grain and (25) Partitions in 225 grain (full price) and still don't have a reasonably accurate load.
I pulled a bag of Nosler 160 gr .284 Partition (seconds) to compare them to the 210 gr .338 Partitions (seconds) which I re sampled to check and make sure that the first sample was accurate. Here are the numbers:
Wgt: Dia: Low: High: Range: Mean: Sigma:
160 .284 158.3 159.7 1.4 gr 159.49 0.431
210 .338 209.7 211.0 1.3 gr 210.32 0.418
85 .243 000.0 000.0 0.3 gr. 85.160 0.097
Summary: the 160 gr .284 bullets are just as dispersed as the 210 gr .338 bullets are (almost, looking only at numbers). The standard deviations are similar (forget about degrees of freedom), the range of dispersion is also similar but .338 bullets have two outliers, vs. one for 7mm bullets. The bottom line is a older box (control group) of Partitions (85 gr .243 Partition) which represent what I normally would excpect from Nosler.
Both seconds have fliers that ruin any attempt to have accurate results without sorting prior to loading. The 7mm sample has one flier and the .338 sample has 2 fliers. Otherwise, populations and std. deviations are similar. Larger sample would reveal even greater dispersions because of mixed lots.
Differences: If I drop out the flier (158.3) from the 7mm bullets, the mean becomes 156.62 and the s=0.109. This means that the expected weight range drops to 159.3 to 159.9 (acceptable .6 total predicted popul. variation).
This is versus the .338 bullets which with the (2) fliers (211.0) dropped out the mean becomes 210.15 and the s=.245. This means that the expected weight range is still 209.4 to 210.9 gr. (still 1.5 gr total predicted popul. variation).
I did a test on the two groups and they were not similar which indicates that the both groups are out of control beut not similar (tri-variate and multi variate). I ordered a box of 210 Nosler bullets (not seconds) that are sample below. Compare this population to the Partition seconds.
These are small samples of small quantities (one box) of bullets and not too much should be read into these numbers but they, when compared to Ballistic Tip or AccuBond bullet samples are not encouraging regarding .338 diameter bullet manufacturing controls.
More data on the 210 Partition Noslers: I bought another box of off-the-dealer-shelf Nosler 210 Partitions. I pulled a sample of 30 bullets (to avoid degrees of freedom issues) out of 50 in the box and weighed each of the 30 bullets. I assumed that this would give me a good statistical characterization of at least this production lot of bullets and the ability to characterize them against the Partition "Seconds" that I spoke of earlier. Let me be clear about this entire subject. I have been lead to believe that "Seconds" of Nosler Partitions are for minor cosmetic defects and small deviance's from product for sale. To me this does not imply that you are buying the setup "shorts" and bullets swept off the floor from prior production lots. To me these would be bullets produced under normal production conditions that as far as QA Release in the production process and did not make the grade. Let me be clear about that!
Testing Results.
The 30 bullet sample of the off-the-shelf product had the following characteristics:
Mean Weight: 210.197
Range of measured Variance: 0.7 grains
Low Sample: 209.8
High Sample: 210.5
Standard Deviation (sigma): 0.187 grains
Predicted Population based on +/-3 sigma: 209.64 to 210.76 (1.12 grains variance)
Note:
1. Both the high and the low sample weights had (2) samples each with (3) samples 0.1 grain just above or below the sample limits.
2. Eleven of the 30 samples weighed 210.2 grains. The sample was multi-modal with (3) distinct population groups (high, middle and low). This grouping indicates a weak statistical control of manufacturing processes with no real process controls in force.
The 210 grain Partition (seconds) group is characterized as follows:
Mean Weight: 210.320 gr
Low Sample: 209.7
High Sample: 211.0 (2 samples)
Range of Measured Variance: 1.3 grains
Standard Deviation (s): 0.418
Predicted +/-3sigma population: 209.065 to 211.575
Note:
1. Distribution of samples is multi-modal and uniformly spread top to bottom.
2. Bottom 8 of 10 samples was within 0.7 grains (same as off-the-shelf product). Two samples weighed 211.0 grains.
Conclusions:
-Nosler has no formal Quality Plan with SPC (re: multi-modal distribution).
-I doubt that any SPC is being used to control setup and tooling dimensional variation. CpK would be predicted to equal less than 0.7, meaning no process control to forecast weight is presently either viable or predictable based on distribution frequencies.
-The Seconds group (except for two 211.0 grain exceptions) is the same in several attributes (ie. sample distribution and variance) as the production released off-the-shelf product. Even standard deviations would be similar if not for two "die setup" high flyers in the "seconds" mix.
-High flyers at 211.0 grains are most likely setup bullets made during final swaging die adjustment, prior to starting production run. They would likely be heavier (longer) than production weights.
-There is a correlation between length and weight as one would expect. The 211.0 gr product is 0.003 longer than any other sample.
-Off-the-shelf bullets show some attempt at trying to run production weights on the mode of the process limits. My sample only can predict process limits because of sample limitations to one lot of product.
-Normal production product variance is higher than I would expect but not outrageous at 0.7 grains
-Standard Deviation for production product is double the measured (s=approx. 0.09) of other lots of Nosler Partitions in sub .30 caliber products.
-Eleven bullets (36%) of the sample weighed 210.2 grains indicating that process can be better controlled.
Note: I have 6 pages of bullet sampling data and calculations (done by Excel) as backup if anyone is interested.
Oldtrader3":3afriy17 said:Thanks, guys. Hardpan, I was Director of Worldwide Manufacturing Operations for 15 years and managed 10 plants in 8 countries in Medical Device, IV Infusion Products that I did all the strategic manufacturing planning for. Prior to that I was a Plastics Molding/Tooling, Automation and Packaging Equipment Engineer/Manager, whatever, for 25 years. Every is ISO9001 buttoned down with SPC and lot history/traceablity. Dealing with the FDA in 8 countries and all. I also worked for a pharma. giant.
I had 120 engineeers in 5 groups working for me at one time and I was Plant Manuf. Director of a 1500 man plant. Plus I have an MBA. I am old and decrepit now and have bad health but a good brain is trapped in a failing body. All this means nothing as I am old and retired now.
beretzs":2u1uom6f said:You sound like you are doing okay OT3, cause as much as you bang away with that 340, you have to have some good life left in ya!! That rifle might handle recoil well, but it still isn't for the faint of heart! Scotty