antelopedundee
internet bum
Is there a generally agreed upon order of primer hardness among CCI, Remington, Federal and Winchester? I was led to believe that Remington is the hardest and Federal the softest? So maybe Rem, Win, CCI, Fed?
Primer Hardness?
- Thread starter antelopedundee
- Start date
See the blue shaded box near the bottom
https://www.accurateshooter.com/technical-articles/primers-and-pressure-analysis/
some info along the lines of what you are asking.
https://www.accurateshooter.com/technical-articles/primers-and-pressure-analysis/
some info along the lines of what you are asking.
FBecigneul
Member
I’m still trying to figure what the pressure is with regard to an .062 flash hole. PSI be damned.
mwezell
Mike Ezell
Interesting! How did you calculate that Wilbur?
I did a small test to see if different primers would reduce cratering in my 30BR on a 700 action.
In particular, I was interested if the primers that are advertised as milspec to reduce the chance of a slam-fire in AR’s would show less cratering. I tried CCI #41 and Fed 205M-AR, with Fed 205M, 205, Winchester small rifle, CCI small rifle, CCI BR-4, and Rem 7 1/2 as standards.
The only one that visibly had smaller craters was the CCI #41. The 205M-AR did not appear any different than the 205 or 205M.
No, it’s not scientific. I didn’t measure thickness, velocity, or anything else. All I did was load them the same, fire, and look at the craters. “Your mileage may vary!”
Regards, Ron
In particular, I was interested if the primers that are advertised as milspec to reduce the chance of a slam-fire in AR’s would show less cratering. I tried CCI #41 and Fed 205M-AR, with Fed 205M, 205, Winchester small rifle, CCI small rifle, CCI BR-4, and Rem 7 1/2 as standards.
The only one that visibly had smaller craters was the CCI #41. The 205M-AR did not appear any different than the 205 or 205M.
No, it’s not scientific. I didn’t measure thickness, velocity, or anything else. All I did was load them the same, fire, and look at the craters. “Your mileage may vary!”
Regards, Ron
antelopedundee
internet bum
Does primer cup hardness have much to do with consistency; i.e. one brand gives more consistent velocities shot to shot than another brand does? All other factors being equal.
FBecigneul
Member
You know, you can do a search on all these factors and come up with lengthy tests and conclusions instead of speculation.
https://precisionrifleblog.com/2012/07/02/most-accurate-rifle-primers-for-precision-reloading/
https://precisionrifleblog.com/2012/07/02/most-accurate-rifle-primers-for-precision-reloading/
antelopedundee
internet bum
I can but I'd just as soon go direct to those likely to know. Someone on another message board was asking about primer variation and that reference was posted elsewhere also. The obvious answer to whether or not primers make a difference is to take your best load and simply try different brands keeping in mind that a different lot of the same brand may not give the exact same results.
Don't know if that's right or not but suspect it's not. I just calculated the area of a .062 inch round hole and applied that to 50,000 psi. I realized after I posted that the total pressure on the primer would be the result of the diameter of the space inside the primer...but who cares. If the primer gives up the ghost you have two choices...get a tougher primer or reduce the powder charge.
in the br game. It DOES NOT MATTER.
what matters is what happens on the TARGET.
SO WORK UP A LOAD with each PRIMER and then go shoot the best.
or do what most do , shoot a primer KNOWN to give uniform great results
that tends to be federal small rifle or small rifle match.
specific loads some time work better with a different primer.
an example is the cc450 in 6mm dasher and rl15.
what matters is what happens on the TARGET.
SO WORK UP A LOAD with each PRIMER and then go shoot the best.
or do what most do , shoot a primer KNOWN to give uniform great results
that tends to be federal small rifle or small rifle match.
specific loads some time work better with a different primer.
an example is the cc450 in 6mm dasher and rl15.
antelopedundee
internet bum
If the pressure inside of a case the instant before the bullet departs is 50,000 psi or pounds then it's equal in all directions, no?
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Kevin Gullette
New member
Perhaps......
......Wilbur meant to type "83 pounds" ??
I recall Jerry Stiller writing a very concise Precision Shooting article, concerning primer cratering/blanking and reducing the boltface firing pin hole diameter.
Anyone else remember?
Kevin
......Wilbur meant to type "83 pounds" ??
I recall Jerry Stiller writing a very concise Precision Shooting article, concerning primer cratering/blanking and reducing the boltface firing pin hole diameter.
Anyone else remember?
Kevin
John Kielly
Shari's fan club
At a rate of 50,000 pounds of force per square inch of area, or 25,000 pounds of force per half of a square inch etc etc.
Yes, that's correct, but it's psi rather than pressure at ANY given point. John Kielly stated this a bit more eloquently earlier but I'm just being Wilbur and sayin' it differently
I think you're right...but I'm pretty easy these days.
antelopedundee
internet bum
I've never handled a small rifle primer so would the generalization about Federal being the best most uniform carry over to large rifle primers?
antelopedundee
internet bum
How does 83 pounds blow out a primer?
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