Comments on: Changing Primer Types Can Alter Load Velocities and Pressures

By: Remington 700 Shooter

Remington 700 Shooter — Fri, 05 Oct 2018 20:24:52 +0000

Very interesting information. Never thought that primer Can affect velocity and pressure.

By: Gene D

Gene D — Thu, 30 Nov 2017 18:14:05 +0000

I think we might have missed the point of the article , while getting into the “weeds” regarding the data , itself . What I got reading the topic was to point out that changing any individual component , particularly the primer , could be potentially dangerous . And we ; as a group , should be cognizant of that . While many here have been shooting and reloading for decades , there are also many new reloaders out there who are totally un-aware that changing a primer brand could have devastating effect , if they are already loading to a near max load . The data was anecdotal to show viable change , and little more , in my mind .

Laurie Holland did a similar but much more extensive testing of both small and large rifle primers , and some of the findings were published on this site awhile back .For those who are into “statistical analysis” , those articles cover the subject in much greater detail , and the methodology seemed very sound .

By: stan

stan — Wed, 29 Nov 2017 20:11:55 +0000

I tend to agree with Josh. Putting up data on the web is great, and we are all free to interpret our own results how we wish, but when we post it for others use and we draw conclusions based on that data (as in this case), it a best practice to include some details, such as number of shots, SD, and equipment used to measure. That way the reader can know how much confidence to put in the conclusion for their own use. Doing this would improve the overall practice of posting data. PRSBlog is a good example of best practice. In the case of this article, I understand that it just a topical blurb (and that the data cited was not really necessary to make the point). The author does a good job pointing out the more important fact that YMMV as they say.

By: Bob

Bob — Fri, 22 Nov 2013 20:15:45 +0000

Change anything and results are likely to be changed to some degree in some place. Thankfully I don’t worry about 15-25 fps swings in velocity. The amount of work you guys put in is amazing. I just load them up the same way all the time and shoot. They hit where I aim so that is good enough for me lol. Long live silhouette shooting as I don’t think I what it takes to be a BR guy.

By: William

William — Thu, 21 Nov 2013 23:39:16 +0000

Mr. Allen – please tone down the sneering a bit and make the internet a more friendly place. As you point out
“We all make decisions, all the time based on anecdotal evidence that would not pass muster for any sort of scientific study, and by and large the process works.” This is called convenience, or faith. It’s not science as you also point out. Since you seem to agree with reader Josh, you could be nicer.

By: Guy

Guy — Wed, 20 Nov 2013 21:27:28 +0000

I think if your load is within 20 fps of being over pressure its to hot to start with. Interesting read though.

By: Boyd Allen

Boyd Allen — Wed, 20 Nov 2013 20:51:23 +0000

I make decisions of the basis of small sample tests all the time. If, on a given day, I find that some load change reduces the size of my groups, I tend to believe the targets. I am familiar with statistics, and also know that some fellows can become so preoccupied with what they have learned about them, that they completely loose sight of what is practical. We all make decisions, all the time based on anecdotal evidence that would not pass muster for any sort of scientific study, and by and large the process works. If someone wants a larger sample, no one is preventing him from gathering the information, but I seldom see any published data from those who nit pick numbers.

By: Josh

Josh — Wed, 20 Nov 2013 00:23:11 +0000

I thank you and your readers for an appetite for this type of experimentation. In the long run it will benefit all of us. The data presented here has little value if it’s given without the number of samples taken or the standard deviations. There is no way to determine if this is statistically valid or just random noise.