Primer comparison question

[jmclfrsh]

I recently got back into reloading after a layoff of firearms for 33 years.

I purchased Federal primers for my first batch of reloads, and even with 850-1000 FPS reduced loads, the primers seem flattened as much as 90% FMJ loads.

They also seem flatter than the primers I used in the past, which were CCI probably.

I look at fired primer flattening to indicate higher pressures than I like. Knowing even reduced loads make the Federal primers indicate a higher pressure that they have to be operating under, I have come to the conclusion that the Federal primers (being reportedly softer than others) just indicate higher pressure than other primers do, like Winchester or CCI.

A false reading, if you will.

They are not completely flattened, just more so than normal it seems. Is that a common occurrence with Federal primers?

If so, I may just use the remainder of these 1000 for my reduced loads, and get some CCI primers to help me better judge when I am reaching higher pressures with faster loads.

Thoughts? And thank you for your responses.

 

[old&slow]

I've noticed from the # of your posts that you appear to be somewhat new to this forum. Three topics that will cause a firestorm on this forum is Politics, Religion, & Primer hardness.

There is NO difference in the hardness of primers !! This is from the people that know what they know, and don't want to be confused by the facts.

Now you will hear from folks that have shoot thousands of rounds in competition that Federal primers are softer and the only primer they use or the only primer that will work in their competition firearm. You will even see product like Miculek spring kits that say
their product only works with Federal primers. But those people really have NO idea what they are talking about.

Sorry, I'm being totally facetious here.

Federal primers are my first choice. Winchester my 2nd choice.
And I have used both with somewhat warm / hot loads. And CCI's are harder than chinese arithmetic.
But that is just my uninformed opinion.

 

[Rule3]

For handgun loads you can not determine anything about pressure by primers. It's like reading tea leaves,

If the primers truly flatten it's to late, you will have a more serious problem

 

[Rule3]

I've noticed from the # of your posts that you appear to be somewhat new to this forum. Three topics that will cause a firestorm on this forum is Politics, Religion, & Primer hardness.

There is NO difference in the hardness of primers !! This is from the people that know what they know and don't what to be confused by the facts.

Now you will hear from folks that have shoot thousands of rounds in competition that Federal primers are softer and the only primer they use or the only primer that will work in their competition firearm. You will even see product like Miculek spring kits that say
their product only works with Federal primers. But those people really have NO idea what they are talking about.

Sorry, I'm being total facetious here.

Federal primers are my first choice and the softest. Winchester my 2nd choice. And CCI's are harder than chinese arithmetic. But that is just my uninformed opinion.

No the primers are not HARDER, the cup may and is THICKER.

Semantics

 

[old&slow]

No the primers are not HARDER, the cup may and is THICKER.

Semantics

Harder ,, Thicker ,, Don't go bang as easy,, ??

I know they are all the same .. Sorry

Anybody know why Federal small pistol primers are so hard to find ??

 

[old&slow]

For handgun loads you can not determine anything about pressure by primers. It's like reading tea leaves,

If the primers truly flatten it's to late, you will have a more serious problem

What Rule3 said.
What caliber,, powder charge, bullet weight, OAL , etc.. ?
I have had some extremely flat ( Federal ) primers out of my 929 ( 9mm revolver). That were not that hot of a load and showed No signs of pressure or flat primers out of autos.

 

[glowe]

. . . There is NO difference in the hardness of primers !! This is from the people that know what they know, and don't want to be confused by the facts.
Sorry, I'm being totally facetious here.

I look at a Forum like this one as an opportunity to learn and/or help others with my own research & experiences. One thing that continues to amaze me is that there are so many people who absolutely-positively know the answer to a question and are not shy about stating it. Problem is that they bring no facts, experiences, or insights to the issue to support their opinions. Who are these "people" and where are the references, so others can learn??

I started loading 30-06 for a newly acquired Model 1903 Springfield a year ago. Not needing to hot-rod the rounds, I settled on loading in the 2500 - 2700 fps, using 150 grain FMJ & one of the standard 30-06 powders, IMR 4895.

I was using Federal primers on my test loads at the range, resulting in an average speed of 2650 fps, but noticed that the primer looked flat. Concerned about this, I loaded 5 rounds each of Federal, CCI, and Winchester primers and back to the range. There was a BIG difference in appearance after firing the rounds. Speed difference was minimal, less than 50 fps from one primer to the other, but appearance was significantly different. Federal primers, once again were flattened against the bolt and edges looked square. Winchester primers showed some flattening, but CCI primers looked original, with round edges as before firing.

With this evidence and lots of years of fretting and stewing about one thing or another I have read, I have come to the conclusion that flattened primers cannot accurately tell you if your reload is hot or not. Did all primers go off - yes; were there any indications of over-pressuring the rifle - no, would I use any of the three primer brands again - yes; will I automatically reduce my loading if primers look flattened - no; are CCI primers harder than others - don't care.

 

[Rule3]

For RIFLE, yes there can be pressure signs on primers, For PISTOL, the only sign is when the gun goes Kaboom!

 

[Rule3]

Harder ,, Thicker ,, Don't go bang as easy,, ??

I know they are all the same .. Sorry

Anybody know why Federal small pistol primers are so hard to find ??

Don't go "bang" is the technical term

Also why are Federal Primers required to have such large packaging??

Because the company wants to pay more for boxing them up? No, because they are more sensitive.

Heck I liked the CCI in APS strips, the packaging case of primers is so much smaller as each little primer is in it's own little cocoon.

 

[Rule3]

This is from CCI a long time ago, no it doen't compare between brands but other companies are tight lipped about their products and would not tell me. There are posts out there on the Web that have measurements of other brands. Hope that is proof enough.

below you will find the primer differences.

Large rifle primers
CCI-200............................ standard mix, standard cup, and standard anvil.
CCI-250............................ Magnum primer, Mag primer mix, thick cup, standard anvil.
BR2.................................... thick cup, standard priming mix held to a tighter tolerance, standard anvil.

So they are really not harder primers, just a thicker c

Make Every Shot Count!
Justin M.
2299 Snake River Ave.
Lewiston, ID 83501
CCI/Speer
(800)379-1732

 

[DWalt]

The principal difference among primers of like type (S or L) is not so much the primer composition or amount, or who makes the primers, but the primer cup thickness. That influences impact sensitivity, and of course thicker cups will withstand higher pressures without failure.

 

[Ivan the Butcher]

The one thing that isn't talked about in this thread; would the reason YOUR primers are flattening on THESE LOADS!

I can think of a few;

The easiest is that in earlier loading equipment, There were flat seating primer posts and convex primer seating posts & some brands of primers came one way or the other. This adds up to NO BIG DEAL.

The worst I can think of is Improper head spacing. This is pretty unusual and if factory ammo is working fine, you have ruled that out.

Somewhere in the middle is your load. It may be too reduced! When fired the case flies against the recoil shield, then rebounds foreword. The pressure is still building and the primer does funny things, these include, the primer backs out, the primer flows in firing pin hole, or the primer flattens in the primer pocket. There may be more! But I believe you need to increase you load. (This is assuming you hadn't made a mistake in the original loads, e.g. similar but wrong powder.)

Hope that this helps.

Ivan

 

[glowe]

Good stuff, but does not address different results using different primers in the same gun, using the same dies and press, with the same loading? If the only variable is the primer, I am pretty sure that Federals flatten, Winchester not so much, & CCIs do not, but it does not concern me as long as I know velocities. I truly believe that anyone who reloads, needs a chronograph and should rely on velocities way more than primer appearance. If you don't experiment with untested powders and use published load data, how can one go wrong?

I think that a lot of unfounded claims are made about flattened primers; hot loads, excess head-space, etc . . . and don't get me started on head-space doom and gloom warnings!!

 

[Nevada Ed]

Federal primers are nice for pistols if you can find them.
Otherwise I use cci or win std primers for my pistols and revolvers.

Rifles are a whole new ball game.
With standard, magnum and match grades out there you have a lot to go
through to see if there really is a difference in your loads and accuracy.

In my 270, I found that std. and Mag CCI primers are needed in the different loads.
In my 30-06 with a 180 and 200gr BT bullet my groups in my '03
were cut in half switching from a cci and going to a win. primer with IMR4350.

Otherwise just buy one type and use the best load and save yourself a lot of trouble.

Safe loading.

 

[Mzuri]

Where do Remington primers fall on the hard/soft or thick/thin cup continuum? I have never used them, but one of my LGSs has a lot of them at a lower price than CCI and Winchester go for at the other local shops.

Federal primers seem to be like hens' teeth around here.

 

[old&slow]

A picture of primers fired in my 929. I was quite concerned
I normally don't post my loads. But, these were, a 147 gr. xtreme plated .356 bullet,, with 3.5 grs. of Bullseye,, Federal SP primers, 1.135 OAL averaged 853 fps out of the 929.
I usually used only Winchester brass in the 929,, but tried different brass to see if it made a difference.

Never had any problems with them ,, but it sure flatten the primers in the revolver.

I don't have a picture of the same load shot out of my autos. But the primers were not flatten at all, and average 950 fps out of my autos.

I also have other firearms that uses moonclips and rimless cartridges and have never noticed the primers this flat?

 

[ggibson511960]

Primer Tribal Knowledge

The reloading hobby has a few unexplored frontiers of knowledge. One of them is primers. To my knowledge there are no published, verifiable data sets on primer hardness or brisance. The manufacturers don't do anything to lower the mysticism with marketing labels like "magnum". This is not unusual in manufacturing and marketing. Nobody really wants objective, data driven comparisons lest their marketers and advertisers be put out of business. This is why reloading manuals are recipe based, or rule based, if you will. Ballistic science relies on a lot of trial and error experience because much of its data is difficult or impossible to obtain. Pressure data is largely confined to test labs who have only in the last few generations been able to get away from crude pressure measurement schemes like copper and lead crusher methods. Primer "hardness" would be another of these mysterious areas that could stand the bright light of objective data, but you won't soon see CCI, Federal or any manufacturer publish objective hardness or strength data on their cups, let alone pressure curves or energy output. What's a reloader to do? Rely on recipes and do as the manuals say. Start low and work up, watching for indicative, but indirect, signs of overpressure.

 

[old tanker]

Most experienced National Match rifle shooters know the number one cause of slam fires in an M1 or M14 is soft, commercial primers - especially Federal Match primers. I've seen or heard about a dozen over the years during 600 yard slow flire. All of them were from loading single rounds and dropping the bolt instead loading from a magazine or SLED. The safety bridge is supposed to keep the firing pin to the rear until it has lost enough momentum to set off the primer prematurely, and the bolt is fully in battery.

It can get ugly.

 

[iPac]

I truly believe that anyone who reloads, needs a chronograph and should rely on velocities way more than primer appearance.

I agree with this. For quite awhile I didn't have a chrono, and it always sucked not knowing the power of my loads.

Eventually I got an affordable chrono and love it. I now know what my loads clock at, and it is really helpful.

Watch for deals and promos and one can find a good chrono for about $100.

 

[H Richard]

Ignoring the "flatness" of the firing result, I did a test on performance a couple years ago. Loading 38 Special, target load, 3.2 gr W231.

I carefully loaded the same make brass (Winchester), with measured load of powder, and carefully seated to the same OAL. I loaded 20 rounds of each, Winchester, Federal, CCI, and Remington. The only difference in any of the loads was the primer.

All rounds were shot from a bench rest, over a chronograph. The difference in Group size, Velocity, Standard Deviation, Extreme Spread was so negligible as to just be ignored. For handguns, I buy whatever primers I can get for the best price.