CCI vs Remington primers for 300 win mag

[dmax1800]

I'm new to a 300 win mag and also to reloading. I'm trying to reload for as much accuracy as I can get. I have CCI large rifle magnum primers and Remington large rifle magnum primers. Which one is going to be best for accuracy??? I've heard that Federal Gold Match primers are the cats meow, but of course I can't get any.

I'm having a Winchester model 70 rebarelled with a match grade barrel and bedded trying to get as much accuracy as possible. I'm using Norma brass and sorting the brass by weight, deburring the flash hole, uniforming the primer pocket, cleaning the brass with a sonic cleaner, sorting the bullets by bearing surface and measuring each powder charge to within .1 grain. I won't know how close to the riflings I can get with the bullets until I get the rifle back.

Any advice would be appreciated.
Thanks.

 

[brentc]

I'm new to a 300 win mag and also to reloading. I'm trying to reload for as much accuracy as I can get. I have CCI large rifle magnum primers and Remington large rifle magnum primers. Which one is going to be best for accuracy??? I've heard that Federal Gold Match primers are the cats meow, but of course I can't get any.

I'm having a Winchester model 70 rebarelled with a match grade barrel and bedded trying to get as much accuracy as possible. I'm using Norma brass and sorting the brass by weight, deburring the flash hole, uniforming the primer pocket, cleaning the brass with a sonic cleaner, sorting the bullets by bearing surface and measuring each powder charge to within .1 grain. I won't know how close to the riflings I can get with the bullets until I get the rifle back.

Any advice would be appreciated.
Thanks.

Try them both and run the one that produces the best results. There is no one solid answer for every rifle. It's a matter of trial and error for all of us.

 

[longrangehunterII]

Each type of primer uses a different mix when they produce their primers and has a much different burn column and degree of how hot it is. Sometimes a change in primer can dial-in a load when you're really close. Testing the load for accuracy using different primers is usually the last thing I change after every thing else.

 

[jasent]

Try them both and run the one that produces the best results. There is no one solid answer for every rifle. It's a matter of trial and error for all of us.

+1. Only your gun can answer that question.
I've had the best results with cci in my 300wm. But yours maybe different.

 

[backwoods83]

There are only 2 things I can tell you, first off the CCIs tend to have a harder cup (usually!), second the CCI250 is as close as you are going to get to Fed215s, rem9 1/2Ms are closer to standard winchester Large Rifle, and WLRMs aren't much warmer than the standard LR. You will likely find the remingtons to work better with the faster powders and the CCIs with the slower ones, but as already stated its a matter of trial an error.

 

[Nevmavrick]

I tend to agree with Backwoods, as I find RP 9 1/2s and 9 1/2Ms tend to be a little "softer" shooting. There are a lot of times when changing to the RPs that my velocities drop a bit...In other words, I MAY put 1.0-1.5 grains more powder in a .300Mag to bring the velocity up to where it was with Federal 215s...not quite so much with CCI 200s.
Have fun,
Gene

 

[jasent]

My 300wm loves cci250.

 

[roninflag]

in my 700 sendero/ krieger in 7mm mag i could inter change 9.5m, cci 250 and wlrm - group size , es , velocity and pressure all the same. 215gm higher pressure , higher es. higer velocity. i do not deburr flash holes .

 

[backwoods83]

Ron would you by chance be using RL 19, 22, or 25 in your 7mm rm? Or perhaps a ball powder? I have noticed that those 3 RL powders and several ball powders from W748 up to Supreme 780 do not care for 215s, they have an inconsistant burn because the lightoff is so fast the powder column burns unevenly/erradically, in those cases a hot but more controlled ignition is better, I no longer use 215s unless I cannot find 215Ms, there is a big difference in my findings that the 215Ms are much better controlled and ever so slightly cooler than a run of the mill 215. I see that you actually mentioned the match version so when I encounter what you have, I simply switch to CCI250 or #34s, if the consistency is still off I go to the WLR. The PMC (russian) standard LRPs are like match grade CCI250s but good luck finding any!

 

[roninflag]

Re: CCI vs Remington primers for 300 wi n mag

Backwoods- interesting. i am using re-19. i developed the load quite a while back , the load works good i hate to change . my kenton knobb was made for it. i believe there other powders "better" i would like be using an" extreme powder". the time i spend developing loads i could actually be hunting . the norma manual shows the 215s as being much better than anything when temp is below 0 though with their powder. i do hunt at times when it is cold.

 

[backwoods83]

Ron there are two powders you can likely duplicate that load with that aren't classified as "extreme" powders but they are not to sensative, Imr4831 and Hybrid100v. On the extreme note H4831 non short cut with WLR or fed210M primers should come in pretty close.

 

[roninflag]

Thanks. i have been working with H-4831 and 140 berger. it not quite as small of a group as the 168/re-19 load. roninflag

 

[lloydsmale]

i like them in this order
fed match mag
fed mag
cci mag
rem mag
ww mag

thing is though is that even though i like the feds best it doesnt guarantee a certain load in a certain gun might prefer another. I done load workup and just bumped the charge up a gain of powder and found that that changed which primer did best. But that said if i look at my load data for all of my mag rifles the feds ted to shine a bit brighter.

 

[rewinder]

[cleaning the brass with a sonic cleaner] Don't forget to dry lube the inside of the necks after cleaning with the sonic-cleaner. It has a tendency to clean to well. The bullet needs a little lubrication to seat smoothly. After being fired the powder residue is good enough. Randy