6mm creedmoor has choice of primers

L

Longshot4

New member
I don't want to confuse this with the 45 Auto primer pocket problem of sorting cases for loading. Although I have seen accuracy improvement with 22 Hornet when using the cooler Remington primers. That's my experience with hot and cold primers. If the colder primer gives a more even burn to the powder. I would suspect that the larger pocket brass may be going away.

It's the first time I have ever seen a manufacturer produce large or small primer size pockets for loading brass in the same rifle type brass case.

I'm looking for feed back on the subject.

Comments welcome
 
I have shot both large and small primer .260 Rems. I don't see a lot of difference in velocities etc. If you are doing LRP's in the CM and using H4350 try some Rem 9 1/2s. 4831 SC liked Federals the best as did Varget
 
I have discovered or at least seem to have noticed the following:

6.5/6mm Creedmoor- I use LRP brass when I load with slower powder/heavier bullets like RL26, H1000 and the 147s for the 6.5 or the 110 and above for the 6mm. Mainly because of the magnum primers that is best used when going this direction and my affinity toward the CCI Large Magnums. SRP brass when using hunting bullets and more traditional caliber powders like H4350, RL16/17 etc.
The SRP make for very predictable loads for hunting which is very important for that first cold bore shot. I can squeeze the trigger with 115% confidence I know where its gonna land even if I have to hold over/under depending on distance.
LRP brass wont last as long with this cartridge...but then again I am not going to fret over 2-3 loads less. I will worry more about a barrel then 100 pieces of brass.
 
One guy I talked to about it (large vs small pockets) was that:
"Small pockets have more brass surrounding the primer pocket due to the smaller radius for the same sized casehead. Therefore, you can load the brass hotter without the primer pocket loosening up as quickly "

Someone like Uncle nick will have to weigh in on that, but that is one advantage I heard.

On the other hand, once you get enough powder in the case, a small primer just isn't going to give you the ignition you need to ignite a large volume of powder. I dont know where you draw the line, but my .300 am has a velocity SD of 4 fps and ES of about 13 fps. I cant imagine a small primer improvement on that, nor can I imagine it igniting the 81 grains as effectively in cold vs hot weather.

Small primers using harder to ignite ball powder like H335, BL-C 2 etc. where a large primer has been traditionally called for also seems like a poor choice.

But I am not an expert on primers so discount accordingly.
 
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