Primer question

[pleadthe2nd]

I've only been reloading for about 3 years now. For my revolver loads I've always used WLP primers, but as we all know, they're a little hard to come by right now. I'm going to buy 2000 cci #350 large magnum pistol primers from a friend who bought them by mistake a month or so ago. All my revolvers are ruger blackhawks, in 45 colt, 44 mag, 41 mag, with the 45 being the convertible, so I load the acp loads too. Powders I use are unique, hs6, AA#9, 2400, and occasionally H110, AA#9 being a favorite right now in 44 mag. What difference should I expect with the magnum primers over the WLP primers, should I not use them with any of the powders I mentioned, just wanting to play it safe. Thanks

[Encore64]

I doubt you'd have a problem. Might back off the charge a fraction of a grain.

Over ignition isn't a problem, under ignition is.

[Ramar]

I used CCI 350 large pistol magnum primers to see if they would cure an unburned powder situation. Couldn't tell a difference between them and Winchester LP primers. None were max loads. I wonder if there's a difference. when the Winchester primer box says they're for standard and magnum loads.

[bradshaw]

Mar 28, 2020 20:48:29 GMT -5 Ramar said:

I used CCI 350 large pistol magnum primers to see if they would cure an unburned powder situation. Couldn't tell a difference between them and Winchester LP primers. None were max loads. I wonder if there's a difference. when the Winchester primer box says they're for standard and magnum loads.

*****

So, what are you saying? How should we know what the question is without data? No gun, no cartridge, no load, not even the powder is named? It is possible that one or another slow powder loaded below “max” will leave traces of partially burned powder. I hazard to say the primmer is not the cause.

I would not allow a trace of powder fouling to keep me from taking a consistent, super-accurate load to the toughest tournament. Perhaps you’re talking about Hodgdon or IMR 4227, which----along with 296, H110, and 2400----certainly has collected its share to championships in magnum handegunning.

Finally, a target @ 100 yards waits patiently to have its say.
David Bradshaw

[pleadthe2nd]

Thanks for the replies, I asked because some of my loads are not magnum level or slow burning powders, these 350's may be all I can get for awhile, sounds like they'll work fine, I'll test them against my regular loads with WLP over my chronograph, see if there's a major difference.

[Ramar]

Mar 28, 2020 21:30:52 GMT -5 bradshaw said:

Mar 28, 2020 20:48:29 GMT -5 Ramar said:

I used CCI 350 large pistol magnum primers to see if they would cure an unburned powder situation. Couldn't tell a difference between them and Winchester LP primers. None were max loads. I wonder if there's a difference. when the Winchester primer box says they're for standard and magnum loads.

*****

So, what are you saying? How should we know what the question is without data? No gun, no cartridge, no load, not even the powder is named? It is possible that one or another slow powder loaded below “max” will leave traces of partially burned powder. I hazard to say the primmer is not the cause.

I would not allow a trace of powder fouling to keep me from taking a consistent, super-accurate load to the toughest tournament. Perhaps you’re talking about Hodgdon or IMR 4227, which----along with 296, H110, and 2400----certainly has collected its share to championships in magnum handegunning.

Finally, a target @ 100 yards waits patiently to have its say.
David Bradshaw

David,
There's really no question. Just commenting on my experience interchanging the two primers. Didn't want to hijack pleadthe2nd's thread with my unburned powder issue. My only point is that Winchester LP primers and CCI LP Magnum primers in the same load didn't make a difference. This isn't a recommendation to interchange the two, but I didn't notice a difference in unburned powder, recoil, or accuracy. No pressure signs in the primers, although, as stated, none were max loads. Hope that helps.

P.S. David, you're always very generous with your knowledge. So are lots of others on this forum and I'm very thankful for that. I've learned a lot! To further my education even more, I'll start a thread regarding the powder in question (AA 5744), etc. Thank you!

[bradshaw]

Ramar.... the are differences in primers, some subtle, some dramatic.

Consistent ignition requires
1) Strong PRIMER INDENT.
2) Enough flame to saturate ignition.

A powder may produce silhouette accuracy in .357, .41, and .44 Mag revolvers, with trajectory-consistent extreme spreads, yet leave residues of combustion in the bore. The sight of a few partially burned granules may upset the handloader. A change of primer may leave the same residue. Another powder of similar burn rate may produce equal accuracy without the residue.
David Bradshaw

[Ramar]

Thanks, David. Valuable info...as always!

[wildcatter]

I do find some primers can increase accuracy in some loads. I have a very hot 357 load that I just could not get the accuracy
with any powder primer combo till I tried a CCI-550 primer. But most loads and calibers I find are not that sensitive to but yes loads already worked up can change slightly with any component change.

Some say lots of powder can change a load, but I have never seen anything a couple tenths of a grain could not fix?