6.5 Creedmoor Lapua SRP Brass Question

[Mark M.]

Those of you shooting the 6.5. Creedmoor using the Lapua SRP brass, Which primer do you prefer? Thanks

 

[whatsupdoc]

CCI 450 is what most all use.

 

[6.5 forever]

CCI 450. No second choice.

 

[6Creed73]

I've only used LRP for a long time, but getting them now is next to impossible. I'm going to start transitioning to SRP brass and I have a ton of CCI BR4 primers. If anyone has used these, I'd like to get your experience. I loaded up a handful but haven't gotten to the range yet to test them.

 

[FeMan]

I use CCI 450s for most loads, but there is one load where the Rem 7 1/2 made a huge improvement.

 

[6.5 forever]

I've only used LRP for a long time, but getting them now is next to impossible. I'm going to start transitioning to SRP brass and I have a ton of CCI BR4 primers. If anyone has used these, I'd like to get your experience. I loaded up a handful but haven't gotten to the range yet to test them.

6Creed. I originally used BR4. Then I tested 450.
Interesting the BR4 were about 15 FPS faster than 450. But the 450 had lower SD.
But I believe this could change with every new lot number.

 

[SSchnd]

450- SD's have been fantastic.

 

[Gb300wm]

Rem 7 1/2 small rifle bench rest works the best for me in my cm and h4350

 

[SSchnd]

Sadly my supply of Rem 7 1/2's is depleted. Not seeing them readily available but 450's have been coming back as the new (like all primers now) prevailing competitive prices.

 

[marchx]

BR4 and Goldmedal.

 

[jvshiver]

I’m using federal 205Ms

 

[Kracken McGraw]

Sadly my supply of Rem 7 1/2's is depleted. Not seeing them readily available but 450's have been coming back as the new (like all primers now) prevailing competitive prices.

Natchez has the 7 1/2’s.

 

[RedfootRanch]

6Creed. I originally used BR4. Then I tested 450.
Interesting the BR4 were about 15 FPS faster than 450. But the 450 had lower SD.
But I believe this could change with every new lot number.

I've never been much on those numbers. Which of these 2 gave the best results according to the target?

 

[BlueWater]

Have used the CCI 450 magnum primers in my 6.5CM. Haven't compared them to a variety of others, but the 450 gives good, consistent ignition.

 

[6.5 forever]

I've never been much on those numbers. Which of these 2 gave the best results according to the target?

At 1 mile, 450.
As, I said, it WILL change from lot to lot.
If your shooting at shorter ranges...you might not see a difference.

 

[JFrank]

I've never been much on those numbers. Which of these 2 gave the best results according to the target?

You have to test for yourself, other guys results are just that. Primers can make a huge difference on paper from receiver to receiver each can have a preference.

 

[Bill K]

Rem 7.5 or #41's

 

[taylorw]

You have to test for yourself, other guys results are just that. Primers can make a huge difference on paper from receiver to receiver each can have a preference.

This post is 100% accurate.
I’ve worked with primer testing more than anything else over the years and can say for sure that primers are not universal.
I’ve noticed that when a rifle won’t stay in tune its often times on the wrong primer.
IMO, you can take a given combo and test 3-4 common primer types and only 1 will stand out, when running a full ladder with each. What I commonly see is that 1 primer will have a nice tune window and come into and out of the tune “softer” but another primer in the test might shoot smaller but have a razor thin window and when it comes out of That area, it leaves the tune very “harsh” with more distance in the print, either to the up or down side.
The more popular primers on the market (215M’s, 210’s, 450’s) have gave me the most trouble in different receivers but I see them mentioned more often than all others.
The ones that I keep falling back on, after going through full testing, with each rifle are BR4’s, BR2’s.
The only rifle that I’ve ever owned that preferred 210’s was a 6.5x284 and you still had to stay on top of that cartridge to keep it where it needed to be to shoot decent at medium or further distance.
As far as your particular cartridge goes.. I’ve had the best luck with BR4’s and as far as being worried about hang firing, I’ve tested them down to 17 degrees and never had a hint of an issue. I’m not so sure if they’re much, if any “cooler” than the 450’s to be honest..

Do what SPJ mentioned above and load below and above your powder window, with different types, and let the print tell you which one to use in your rifle. Don’t just look at the node, factor in how the print forms in and out of that node also.

 

[Mark611]

I have ran the CCI#450's and the #41" also, but not enough to give you an answer you might want, I compared the SRP with the LRP cases, small rifle primer were too hard to find when I started my load development, but I eventually got some SRP's, in the waiting period for the SRP's I purchased LRP cases, due to having an amount of LRP's that said, after I compared the 2 case with the exact same loads other than the primer size, the LRP cases way out performed the SRP cases, YMMV

 

[RedfootRanch]

I stock CCI 400 & 450's and Rem 7.5's. I can't tell you which will work the best for any bullet/powder/rifle action combination at 600 and beyond without testing it myself. Unless I'm out hunting, every shot I take goes by a Labradar for MV. This will indicate an outlier for a particular load, and 'group' repeatability on target trumps SD/ES numbers.