6.5 CM Large or Small Primers brass

motrapper

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Oct 14, 2007
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397
Location
Sandy Utah
Is there really any real world difference. I am just starting to reload the 6.5 CM for my brothers kids and want to start out right.
All opinions appreciated
 

Another Casual

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Apr 2, 2015
Messages
486
Location
Colorado
If nothing else, small primer pockets seem to last longer. In my case I have more small rifle primers than large. Easier to just stock one type. Testing by Lapua says the small with a smaller flash hole is better, but either can be made to shoot very well. Go with whatever you can find.
 

Hondo64d

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May 27, 2003
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616
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The Big Country
Is there really any real world difference. I am just starting to reload the 6.5 CM for my brothers kids and want to start out right.
All opinions appreciated
I have read accounts by folks I trust that said they had issues with SRPs producing misfires in cold weather conditions In Creedmoor sized cases. I don’t want to take that chance so I opted for Alpha Munitions LRP brass for my Creedmoors. Their brass is very high quality and primer pocket life has not been an issue for me even with some very stout loads.

John
 

Winkfish

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Sep 27, 2016
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191
Location
Wisconsin
I have shot from -40 to plus 100 degrees with my 6.5 creed, large rifle primer combo, and I have not had a single issue. I have been using H4350, and a mix of CCI and federal primers. For me, with Hornady brass I am getting smaller SD from the CCI primers. Additionally I am seeing around 12-15 reloads on the Hornady brass before the pocket starts to loosen up.

For the application of hunting and PRS the large rifle primes have worked well for me. I understand everyone does have different experiences however.
 

jasonco

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Feb 11, 2009
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1,509
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Colorado
The only "difference", in my use of large or small primer 6.5 Creedmoor brass is that, I use Peterson small primer for high pressure hunt loads, using the Berger 156 EOL. I'l use the large primer Hornady case for, 140 grain bullets and lighter, loads.
 

epoletna

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Jan 10, 2015
Messages
512
Location
Northern Nevada
I discovered (by breaking a pin) that some LRP decapping pins will not fit through the SRP flash hole. If you go this route, make sure you have a SRP decapping pin. Otherwise, not a lot of difference between SRPs and LRPs.
 

lyle2231

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Joined
Jan 26, 2014
Messages
220
Location
Hollywood
I discovered (by breaking a pin) that some LRP decapping pins will not fit through the SRP flash hole. If you go this route, make sure you have a SRP decapping pin. Otherwise, not a lot of difference between SRPs and LRPs.
I busted a srp pin yesterday, adapted a wire brad (nail) to the .223 die, back in business.
FWIW… be gentle until the new one comes in
 

Roninco

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May 7, 2020
Messages
166
Location
Colorado
Lapua small primer flash hole size is spec'ed at 1.5mm which is .059". This may be smaller than a normal small decapping pin. A normal decapping pin may enlarge or stick in the Lapua flash hole. I turned down the end of the decapping pin in a universal decapping die to .057" for use with the appropriate Lapua brass.
 
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