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Old 11-19-2017, 08:14 AM   #11
Quickdraw
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I don't know much more than I've read about the Lapua small primer brass. I got 15 firings out of my last batch of Hornady 6.5 brass though so I'm OK with that. Rifle shot sub 1/2 Moa all the way to this point with 2400 firings on the factory barrel. Based on that my current batch of brass will toast 2 more barrels before I need to think about what to buy for brass next time and maybe by then more manufactures will come out with small primer options.
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Old 11-20-2017, 04:05 PM   #12
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small rifle primers produce more consistent ignition which will cause lower ESs which improve accuracy with the added benefit of being able to run higher pressures with longer brass life.

just an FYI its best to have a small firing pin if your going to run SRPs...large firing pins are notorious for piercing SRPs...CCI450s are supposed to have the hardest cups.

also star line, peterson nad lapua all have SRP 6.5CM brass...i was running necked down 6.5 lapua in my 6mm CM and was very happy with it.
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Old 12-05-2017, 11:38 PM   #13
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The primer pockets will stay tight longer with small primers, and you will get better ignition. (CCI-450 primers)
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Old 12-06-2017, 08:11 PM   #14
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Just starting out in the 6.5 CM world and still learning.
In line with the subject small vs large primers.
Does the powder type matter?
Which one would go well for gas and for bolt guns? Or it does not make a difference.
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Old 12-07-2017, 01:46 PM   #15
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powder depends a lot on the free bore of the reamer used to chamber your rifles...H4350 is pretty much the gold standard and if you have or can get some you dont need to look any farther...but...just to name a few that will work well...

RL-16
RL-17
RL-26
H4831sc
IMR4350
IMR4451
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Old 01-03-2018, 03:10 PM   #16
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Quote:
Originally Posted by LongRange View Post
powder depends a lot on the free bore of the reamer used to chamber your rifles...H4350 is pretty much the gold standard and if you have or can get some you dont need to look any farther...but...just to name a few that will work well...

RL-16
RL-17
RL-26
H4831sc
IMR4350
IMR4451
In the absence of H4350 which of the above powders would you recommend for a semi AR10 platform?
Thank you.
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Old 01-03-2018, 03:45 PM   #17
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if its a 6.5CM IMR4451 is what id start with...its a double base powder that will run a little faster than H4350 with less pressure and is supposedly a little more temp stable than RL-17....then id go to RL-17 if the 4451 dont shoot...i shot a LOT of RL-17 and never seen the huge temp swings everyone claims.
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Old 02-04-2018, 12:05 AM   #18
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Quote:
Originally Posted by LongRange View Post
just an FYI its best to have a small firing pin if your going to run SRPs...large firing pins are notorious for piercing SRPs...CCI450s are supposed to have the hardest cups.
I meant to post this earlier but was looking for an image hosting site. When the Lapua brass first hit the market, I was keeping my fingers crossed that I wouldn’t have any issues. I knew that I had a rifle with the large firing pin. Sometimes it’ll work. These rounds were fired with a large firing pin with the SRP Lapua 6.5 Creedmoor brass. If you look at the primers, the left one was shot at a sane pressure well below max. Looking at the middle and right pieces of brass, the primers are just starting to pierce. You can see the primers wanting to flow through the opening in the bolt face. After blanking a primer, I stopped right there because I knew that I had to load them hotter. The latter two were shot slightly hotter but well below max pressure:




If you have a large firing pin and want to use a small rifle primer you basically have three options. You can continue to use brass with large rifle primers, get your bolt face bushed or purchase another complete bolt body with the small diameter firing pin. Greg Tannell of Gretan Rifles is one of the best to do this. The following pic is of two Accuracy International bolt faces. I opted to just purchase a complete factory bolt assembly with the small diameter firing pin. You can see the difference in the large vs. small diameter firing pin:



Once I changed out the bolt there have been no issues at all even at max pressures. I really, really like the Lapua SRP brass especially for its consistency and longevity. Prior to this, I was resizing and fireforming Lapua .308 LRP brass into 6.5 Creedmoor because I wasn’t satisfied with the consistency of other factory brass. Lapua might be more expensive but in the long run it’s well worth it.
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Old 02-04-2018, 12:35 AM   #19
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Yep the large pin will pierce primers pretty easily and well below max pressures worst part is if a primer is pierced it could ruin the pin and the bolt face so you either bush or replace the bolt.

Peterson brass makes small and large primer Creedmoor brass and would be my second choice as itís pretty tough.


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Old 02-04-2018, 12:52 AM   #20
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Cujo are those loading blocks plastic or aluminum?


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