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Big or Little? (Primers)


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#1 OFFLINE   Flesh Wound

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Posted Jul. 17 2017 - 01:22 PM

Over the weekend I cleaned 700+ cases. Amongst these are about 600 7.62 x 39 brass. I intend to convert some of these to 6.5 Grendel brass.

 

In the mix I have about 250 Remington small primer cases and the rest a mixed bag of large primer cases with many headstamps. Most being IMI and Yugoslavian. A few Lapua and Winchester too.

 

I already have a few genuine factory 6.5 cases from PPU that are large primer.

 

Now usually I'm not the kinda guy that gets sweaty over primer sizes. However I see a lot of "disCUSSion" in some of the forums about the differences between the two primer sizes when creating your loads for the Grendel.

 

I'm thinking to use the large primer brass as it's the same as the few real Grendel cases I have. Also the small primer 7.62 Russkie is sought after by the folks that hand load for their bolt guns.

 

So am I off base here with my decision to use the large primer cases? If so, what is wrong with my thinking?

 

Thanks.




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#2 OFFLINE   towtruck

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Posted Jul. 17 2017 - 01:29 PM

Develop the load with large primers until you are happy..........try that load with a few small primer cases and see what happens. If they shoot the same your good to go....if not sell them or use them for other adventures.

 

just my 2 cents




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#3 OFFLINE   Jaeger48

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Posted Jul. 17 2017 - 02:11 PM

Develop the load with large primers until you are happy..........try that load with a few small primer cases and see what happens. If they shoot the same your good to go....if not sell them or use them for other adventures.
 
just my 2 cents


I'd sell them for the sake of consistency if you're going to load bulk stuff.


#4 ONLINE   TomJefferson

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Posted Jul. 17 2017 - 02:33 PM

Personally I find the whole topic slightly over nothing.  It's about the spark not the size of a primer and you can have hot and mild large and small primers.  If you develop your load right, you are going to achieve the muzzle velocity you need for the best accuracy you can achieve.




#5 OFFLINE   Jaeger48

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Posted Jul. 17 2017 - 02:41 PM

Personally I find the whole topic slightly over nothing.  It's about the spark not the size of a primer and you can have hot and mild large and small primers.  If you develop your load right, you are going to achieve the muzzle velocity you need for the best accuracy you can achieve.


It's a thing if you're loading up a progressive press and have the wrong primer size come through.


#6 OFFLINE   GLShooter

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Posted Jul. 17 2017 - 02:47 PM

All my Grendels are small. That is pretty standard. Either will do fine but I'll stick with the original.

PPU is the odd duck size.

Greg


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#7 OFFLINE   Flesh Wound

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Posted Jul. 17 2017 - 02:51 PM

Personally I find the whole topic slightly over nothing.  It's about the spark not the size of a primer and you can have hot and mild large and small primers.  If you develop your load right, you are going to achieve the muzzle velocity you need for the best accuracy you can achieve.

 

This. My feelings exactly.

 

 

All my Grendels are small. That is pretty standard. Either will do fine but I'll stick with the original.

PPU is the odd duck size.

Greg

 

I prolly should see how many of both small and large primers I have on hand.




#8 ONLINE   TomJefferson

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Posted Jul. 17 2017 - 03:04 PM

 

This. My feelings exactly.

 

 

 

I prolly should see how many of both small and large primers I have on hand.

Bingo




#9 OFFLINE   newbe

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Posted Jul. 17 2017 - 04:50 PM

My guess is either will work. Pick one and go with it.

I hate having mixed primer sizes for one caliber like 45 ACP. Drives me nuts.


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#10 OFFLINE   Flesh Wound

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Posted Jul. 17 2017 - 06:40 PM

My guess is either will work. Pick one and go with it.

I hate having mixed primer sizes for one caliber like 45 ACP. Drives me nuts.

 

This. 6.8 SPC II is this way. Large and small.




#11 OFFLINE   GLShooter

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Posted Jul. 17 2017 - 06:52 PM

 

This. 6.8 SPC II is this way. Large and small.

 

I believe only Remington is large though and it is not near as popular out in the wild.  The new SSA will be small.  That is truly a blessing vs. the 45 ACP out there along with 10 MM. The new Creedmoor brass from LAPUA will be available in both.  There is no SPC II brass BTW. It's all SPC. The II is a different chamber throat and leade but the cases remain the same.

 

Greg







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