Got to thinking again 6BR vs 6ppc in slow powder

82boy

82boy

Patrick Kennedy
OK guys heres one for you. In a 6PPC when using a slower powder like H4895 great success has been reported by opening up the flash holes. This is a good combo, and has a few wins behind it. Why don't they use a magnum primer with the slower powder like the 6mm Br guys?

Now when shooting the 6mm Br, most times people load slower powders like Varget (Which is close in burn rate to H4895.) Why don't they open up the flash holes, like the PPC guys? Many have reported great success with 450 CCI magnum primers or the Remington 7 1/2 which my understanding is it is also a magnum primer, could this be to accommodate the small flash holes?

Am I missing something here?
 
Wow, I am kind of surprised, 166 views and only one answer.
Maybe I need to rephrase the question.

What is the theory of opening up the flash holes on a PPC when using H4895 powder, or what does this accomplish?
Why is not the same theory used on the BR cartridge? The two cartridges are similar in design, and close in case capacity.
 
I'm shooting the ppc. I have found better results lately with the remington 7 1/2 primer.
I havent changed the flash holes size. I also tried some in the 6mm dasher i have. It works very well in the dasher.
I'm using 80 and 100 gr pills in the 6 dasher and getting groups in the 2,s at 100 yds.
Maybe there is still another use for the new powder. I'm also trying it in the 308.
 
We're just speculating here -- as with so many things on BR Central -- but I don't think there is an equivalency between "primer strength" and flash hole size. For example, in a long-range chambering of mine, I have four barrels. Two of them prefer magnum primers (215s) with Rel 22 or 25, two prefer 210s. But change the powder to H-4831 -- at least as hard to ignite -- then the two that preferred 215s suddenly prefer 210s. "Prefer" meaning group size and consistency.

I had another barrel in a different chambering where one bullet powder combination (187 BIBs and Rel 22) shot better with 210s, but changing the bullet to the 215 Clinch Rivers meant going to Federal 215 primers. Yet with the same 215 Clinch River bullets, it shot better still with 210s and VV N-560 -- a powder very similar to Rel-22.

For me, I've concluded that you cannot choose primers by some theoretical function (strong, weak, whatever), you have to test with each barrel, powder, and bullet combination.

So, again for me, while primer strength and flash hole size both, in some fashion, involve ignition, I don't thing you're in a tradeoff situation. I've even shot one chambering -- a .30 BR -- where I drilled the flash holes for a faster powder, IMR 4227. It just shot better that way.
 
I shoot the 6BR in bechrest mode,with a 14 twist...i just love it, i like the versatility of the cartridge.
I have shot the remington cases with the .080 flash holes, very good groups they shoot well.
but best accuracry is had with lapua cases with the small flash holes.
best accuracry for group shooting seems to come with fast powders that max at aprox-30.5grs of powder.
the cci 450 mag primers have allways produced the most conistant loads or groups, i do not know why..
but N133 will shoot at 31.5grs and that is a full case but likes the fed 205m primers.
now how does 31.5grs fill the case off a 4" drop tube while i can get 34.0grs of RL-15 in there..alot of times there is a difference in how you put the powder in the case, fast dump,slow dump,long drop tube,swirling the powder in a funnel on a long drop tube.ect.
as for the PPC with a larger flash hole, i just dont think it would make much differance as long as they are all the SAME and you tune that load.
 
Curiosity got the best of me reguarding flasholes, so I drilled some PPC cases to .081. They shot no better or worse in the gun
I tested this in. Going farther, I drilled some to whopping big---.101 like a bay window. I shot a very small group, but next
group was kinda big. Having some PPC cases lying around that had sloppy flasholes, I made them all .073 and shot my
smallest 10 shot-200 with a rail gun and 4198 Dupont It was a light rain and no wind
conclussion:: those are nice conditions to shoot in
 
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