Primers

[USMCDOC]

I used to weight my primers, then stopped doing it.. but i do separate my brass and load and shoot them from the heaviest case to the lightest case.

 

[Killshot]

Jerry Tierney told me the best thing you can do to gain a edge on your usual competitors is to buy them a concentricity gauge and tell them that you weigh primers.

Miss that guy.

 

[rardoin]

I am in the development phase on a primer uniforming tool...

To be released 4/1/2017.

 

[Killick]

Along with weighing primers I make a note of the match winners hat...I have a lot of hats.

 

[Medium rare]

I turn all my primers in my lathe. Always do it between centers because my headstock is too long.

 

[Ringostar]

I turn all my primers in my lathe. Always do it between centers because my headstock is too long.

Jerry Tierney told me the best thing you can do to gain a edge on your usual competitors is to buy them a concentricity gauge and tell them that you weigh primers.

Miss that guy.

You guys have caught on to the newest secret. It's primer concentricity!

 

[R.Morehouse]

I knew that...........

 

[DRNewcomb]

Someone would have to show me chronograph results showing how, with everything else the same, sorting match-grade primers by weight made a difference.

 

[JRS]

Someone would have to show me chronograph results showing how, with everything else the same, sorting match-grade primers by weight made a difference.

And unless the cups are identical in size and thickness, and the compound exactly the same amount in each cup…..

 

[dkhunt14]

Someone would have to show me chronograph results showing how, with everything else the same, sorting match-grade primers by weight made a difference.

A chronograph shows nothing. Sometimes the best ES is the worst vertical at 1000. Matt

 

[dkhunt14]

And unless the cups are identical in size and thickness, and the compound exactly the same amount in each cup…..

I know a guy that took primers apart and weighed them on a 5 decimal scale. He said they are pretty much dead on for the cups and anvils. If you weighed fired ones it would pretty much show if they are close. If there is a difference on new ones, it is in the mixture. Matt

 

[hogpatrol]

I don't compete but for those that do, I've had good luck using pin gauges on the flash holes. A lot of variation from erosion on the first firing then they seem to settle down. I segregate the ones that are more than .002 out of the mean.
I do weigh my primers, a 1000 at a time, on my postal scale. Usually you can tell if there are some suspect ones that way.

 

[JRS]

I don't compete but for those that do, I've had good luck using pin gauges on the flash holes. A lot of variation from erosion on the first firing then they seem to settle down. I segregate the ones that are more than .002 out of the mean.
I do weigh my primers, a 1000 at a time, on my postal scale. Usually you can tell if there are some suspect ones that way.

 

[USMCDOC]

I don't compete but for those that do, I've had good luck using pin gauges on the flash holes. A lot of variation from erosion on the first firing then they seem to settle down. I segregate the ones that are more than .002 out of the mean.
I do weigh my primers, a 1000 at a time, on my postal scale. Usually you can tell if there are some suspect ones that way.

Can you tell me what kind of bell curve you get with that?

 

[dkhunt14]

As a side note the guy that weighed them made a gun to shoot Guage balls. It used a primer as the propellant. He figured he could chronograph the balls. You wouldn't believe how hard a primer can shoot a Guage ball. The stainless balls went through his car board bullet trap, through the stove pipe and into the wall. Matt

 

[dkhunt14]

I think it depends on what shooting sport you are in. Does it matter at a hundred? Probably not. Does it matter at 600? Maybe. Does it matter in F-Class? Seeing they don't count group, probably not. Does it matter in 1000 yard BR? Yes. Always matter? Probably not. Testing with really accurate heavy guns. The ones that weigh 80 pounds and run on rails show it makes differences on the target. In our game if you look at the difference between winning the 10 match group aggregate and finishing second was .024. That is .024 times ten for 10 Ten shot targets, which calculates to .240 for the year. That was the difference between a Nightforce 12x42 BR and nothing at all. You can make fun all you want but I saw really good guns show the difference on paper. Was it great differences? No. Sometimes it was only a 1/4 to 1/2 inch. But it repeated a lot of times. Matt

 

[hogpatrol]

Can you tell me what kind of bell curve you get with that?

Similar to one of the coasters at Cedar Point.

 

[dbduff]

Looks like a rabbit hole to avoid, but if you couldn't resist......weigh 100 unfired primers of same lot, note how much they vary in weight. Fire said primers and weigh same 100 spent primers. Compare the differences in variability in weight for unfired versus fired primers. Note group size, extreme spread, velocity etc. etc. Just inside that rabbit hole will be your answer as to wheather it's some thing to spend time on. If you insist, sort 100 unfired primers into same weight lots and fire, measuring results of group. Weigh spent primers. Do same with 100 unsorted primers and compare group results, then weigh spent primers from that un sorted group. Compare variability of unsorted group to the weight sorted fired primers. Second suggestion assuredly guarantees a bottomless rabbit hole.

 

[USMCDOC]

Looks like a rabbit hole to avoid, but if you couldn't resist......weigh 100 unfired primers of same lot, note how much they vary in weight. Fire said primers and weigh same 100 spent primers. Compare the differences in variability in weight for unfired versus fired primers. Note group size, extreme spread, velocity etc. etc. Just inside that rabbit hole will be your answer as to wheather it's some thing to spend time on. If you insist, sort 100 unfired primers into same weight lots and fire, measuring results of group. Weigh spent primers. Do same with 100 unsorted primers and compare group results, then weigh spent primers from that un sorted group. Compare variability of unsorted group to the weight sorted fired primers. Second suggestion assuredly guarantees a bottomless rabbit hole.

The premise of weighing primers isn't about groups really, but more so about reducing vertical dispersion. Esp at greater distances.

 

[Mark C]

Well all interesting views ... I've tried out to 600 yards I've never seen a bit of difference at all but maybe out to 1000 there could be but I've never tried a test out that far .