CCI vs Win Primers

Clubster · January 24, 2025, 08:04 PM

Hey all… It’s my understanding that WLP primers will do both mag and non mag needs. In addition, WSP primers will do both mag and non mag as well. I am at a point where I need to grab more primers so instead of having a mix of four CCI primer part numbers I can have just two primer part numbers if using Winchester. Any reason not to go this route to stock more with less? I load target 38 spl, .357, 44 target, 44 hot, 9mm and 10mm.

Shadow9mm · January 24, 2025, 08:10 PM

Sounds like a great idea to me, but your gun/loads might not like them. I would see if you can buy a couple sleeves of each first, try them out, make sure you are happy with them before you go all in. But if your guns like them I would 100% do that,

Clubster · January 24, 2025, 08:21 PM

Will give that a shot. Just don’t know how the CCI and Win differ overall for it to work with Win but not CCI on consolidation.

totaldla · January 24, 2025, 09:39 PM

WLP is the same "hotness" as CCI350, according to my chronograph in 44mag. But the cup is thinner with WLP.

black mamba · January 24, 2025, 10:10 PM

I would be happy to spend the rest of my shooting life with just WLPs. They are consistently accurate, work in any load, and have never let me down through tens of thousands of rounds.

74A95 · January 25, 2025, 08:44 AM

Quote:

Originally Posted by Clubster

In addition, WSP primers will do both mag and non mag as well.

Winchester makes two small pistol primers; standard small pistol (WSP) and magnum small pistol (WSPM).

https://online.flippingbook.com/view/504338257/43/

Clubster · January 25, 2025, 11:40 AM

So they have small pistol, large pistol and large pistol magnum. Does the small pistol also get used for small pistol magnum then?

bamaranger · January 25, 2025, 12:37 PM

At some point in time, I bought some Win large pistol primers which were labeled "For Standard or Magnum Loads". I loaded them into 10mm Auto with a stiff charge of Unique but not over a listed max. This load, using CCI primers, had performed acceptably for me and gave good, consistent velocities, but was clearly max.

Shot a magazine full of the new loads, using the Winchester "standard or magnum" primers through the G20 and noticed blast was significantly higher, and in collecting the spent cases, found several displaying the "Glock bulge". Pressures were clearly higher using the Winchester primers.

Bad on me of course. I should have reduced the powder charge when changing components. And max charges of Unique can be a bit squirrely and sensitive to variables. I knew all that, but components were hard to find, the load wasn't all that "hot", velocities were not sensational and I figured (wrongly) that I would be OK. Lucky and lesson learned.

I quit using Unique for the 10mm Auto. I loaded the remaining carton of "standard or mag" primers into mid range, low pressure .45 acp loads. Winchester primers, at least that batch, were hotter than CCI.

orionengnr · January 27, 2025, 09:27 PM

Quote:

So they have small pistol, large pistol and large pistol magnum. Does the small pistol also get used for small pistol magnum then?

No, they had LPP which were listed for both standard and Magnum loads. Those were the blue boxes. The newer white and red box just says Large Pistol Primers, no reference to standard or Mag. No idea if the formulation has changed.

They have SPP in standard and SPP in Mag.

RC20 · January 28, 2025, 08:04 PM

I long ago decided it made no difference. One may work better for a given powder, but they all work. They may work fine with the same powder with different loads, shrug.

CCI has always been readily available so I use those and that removes any questions about adjusting around a primer.

rodfac · January 29, 2025, 10:08 PM

Never had a problem with either, and as I run a pair of Dillon 550's, and CCI's don't feed as well through them, I buy Winchesters. Too, in over 50 years of loading my own ammunition, I've never found a load where a change of primer, made a measurable difference.

To be clear, I've been a competitor in NRA Bullseye handgun, Smallbore rifle, and Hi Power, National Match Course, where I saw no difference. I've also been a hunter for the same decades...

Those that participate in "F" class or one of the other extreme long range competitions may have found where primers make a difference. Bench Rest would be another discipline that would or may show a difference.

YMMv , Rod

jag2 · January 31, 2025, 01:28 PM

Just me but I think primers aren't all that important Remember when there were no SPP for their 9mms so everyone was using SRP instead? In fact many competitive shooters said they do that all the time. I know I did. For me the ones that are easiest to seat are my favorites. CCI, Win, yes. Ginex, no. If you feel you must tinker with the load go ahead.

January 24, 2025, 08:04 PM	#1
Clubster Member Join Date: February 4, 2024 Location: St Louis, MO Posts: 78	CCI vs Win Primers Hey all… It’s my understanding that WLP primers will do both mag and non mag needs. In addition, WSP primers will do both mag and non mag as well. I am at a point where I need to grab more primers so instead of having a mix of four CCI primer part numbers I can have just two primer part numbers if using Winchester. Any reason not to go this route to stock more with less? I load target 38 spl, .357, 44 target, 44 hot, 9mm and 10mm.

January 24, 2025, 08:10 PM	#2
Shadow9mm Senior Member Join Date: March 21, 2012 Location: Indianapolis, IN Posts: 4,603	Sounds like a great idea to me, but your gun/loads might not like them. I would see if you can buy a couple sleeves of each first, try them out, make sure you are happy with them before you go all in. But if your guns like them I would 100% do that, __________________ I don't believe in "range fodder" that is why I reload.

January 24, 2025, 09:39 PM	#4
totaldla Senior Member Join Date: August 11, 2009 Location: SW Idaho Posts: 1,499	WLP is the same "hotness" as CCI350, according to my chronograph in 44mag. But the cup is thinner with WLP. __________________ Keltec P15 at 1200 rounds

January 25, 2025, 12:37 PM	#8
bamaranger Senior Member Join Date: October 9, 2009 Location: North Alabama Posts: 8,799	primers At some point in time, I bought some Win large pistol primers which were labeled "For Standard or Magnum Loads". I loaded them into 10mm Auto with a stiff charge of Unique but not over a listed max. This load, using CCI primers, had performed acceptably for me and gave good, consistent velocities, but was clearly max. Shot a magazine full of the new loads, using the Winchester "standard or magnum" primers through the G20 and noticed blast was significantly higher, and in collecting the spent cases, found several displaying the "Glock bulge". Pressures were clearly higher using the Winchester primers. Bad on me of course. I should have reduced the powder charge when changing components. And max charges of Unique can be a bit squirrely and sensitive to variables. I knew all that, but components were hard to find, the load wasn't all that "hot", velocities were not sensational and I figured (wrongly) that I would be OK. Lucky and lesson learned. I quit using Unique for the 10mm Auto. I loaded the remaining carton of "standard or mag" primers into mid range, low pressure .45 acp loads. Winchester primers, at least that batch, were hotter than CCI.

January 28, 2025, 08:04 PM	#10
RC20 Senior Member Join Date: April 10, 2008 Location: Alaska Posts: 7,334	I long ago decided it made no difference. One may work better for a given powder, but they all work. They may work fine with the same powder with different loads, shrug. CCI has always been readily available so I use those and that removes any questions about adjusting around a primer. __________________ Science and Facts are True whether you believe it or not

January 24, 2025, 08:21 PM	#3
Clubster Member Join Date: February 4, 2024 Location: St Louis, MO Posts: 78	Will give that a shot. Just don’t know how the CCI and Win differ overall for it to work with Win but not CCI on consolidation.

January 24, 2025, 10:10 PM	#5
black mamba Senior Member Join Date: September 13, 2011 Location: SW Florida Posts: 909	I would be happy to spend the rest of my shooting life with just WLPs. They are consistently accurate, work in any load, and have never let me down through tens of thousands of rounds.

January 25, 2025, 11:40 AM	#7
Clubster Member Join Date: February 4, 2024 Location: St Louis, MO Posts: 78	So they have small pistol, large pistol and large pistol magnum. Does the small pistol also get used for small pistol magnum then?

January 29, 2025, 10:08 PM	#11
rodfac Senior Member Join Date: January 22, 2005 Location: Kentucky Posts: 3,657	Never had a problem with either, and as I run a pair of Dillon 550's, and CCI's don't feed as well through them, I buy Winchesters. Too, in over 50 years of loading my own ammunition, I've never found a load where a change of primer, made a measurable difference. To be clear, I've been a competitor in NRA Bullseye handgun, Smallbore rifle, and Hi Power, National Match Course, where I saw no difference. I've also been a hunter for the same decades... Those that participate in "F" class or one of the other extreme long range competitions may have found where primers make a difference. Bench Rest would be another discipline that would or may show a difference. YMMv , Rod __________________ Cherish our flag, honor it, defend it in word and deed, or get the hell out. Our Bill of Rights has been paid for by heros in uniform and shall not be diluted by misguided governmental social experiments. We owe this to our children, anything less is cowardice. USAF FAC, 5th Spl Forces, Vietnam Vet '69-'73. Last edited by rodfac; January 29, 2025 at 10:13 PM.

January 31, 2025, 01:28 PM	#12
jag2 Senior Member Join Date: June 30, 2009 Location: dallas Posts: 779	Just me but I think primers aren't all that important Remember when there were no SPP for their 9mms so everyone was using SRP instead? In fact many competitive shooters said they do that all the time. I know I did. For me the ones that are easiest to seat are my favorites. CCI, Win, yes. Ginex, no. If you feel you must tinker with the load go ahead.