Cryhavoc
Silver $$ Contributor
Likewise, I've found that as good as the Lapua brass's quality is, I still deburr their flash holes when I first get them. Most of them don't have a burr, but a few of them do and my 21st Century deburring tool easily takes care of them.If you're not checking, you should be.
Lately, I've noticed quite a bit of variation of flash hole diameters on later Lapua 6BR cases. In the past, I've just opened them all to .0625 for a consistent size. But on some new 30BR cases I'm finishing, the diameters were all over the place.....from a few at .057 all the way to .062 as verified by a pin gauge. With a 20X loupe, all the holes were nice and round with no slivers of material to skew the measurements. This was from 50 cases this morning...you can see by the material that some holes were just touched up and some had quite a bit more removed.
Good shootin'-Al...
- AlNyhus
- Replies: 7
- Forum: Reloading Forum (All Calibers)
Basically, I don't think the powder really matters. But, I should point out that larger flash hole, like I found in my .308 Alpha brass, does present an issue related to pressure on the primer during ignition. I found using thin cup primers, like the CCI 400's, would easily get pierced. Going to primers with thicker cups solved this issue.I think it depends on the powder also. Why would they make .080" small rifle primer flash holes? If you just blow out the small primer flash hole with a large rifle deprimer, it will grow to .0695". The case size also matters and how much powder you can burn. I experimented with different size holes to see which one works best with my load. I read that the 6.5 Creedmoor was on the edge of wheather it matters that much to the average shooter as far as accuracy goes. But the small rifle primer should take more pressure. The 6 Creedmoor can burn a little more powder than the 6.5 from my reloading books. So I would not give up, I would try different sizes to see for yourself what works best for you and your loads with magnum small rifle primers.
DON<T DO IT .I have another thread going, Having an issue with a rifle and have decided to try new lapua brass I have been holding onto. It’s for a 6 creedmoor I do not want any hangfires or stuck decapping pins. What size do I need to ream the flash holes ? I believe you guys have it down to a science now lol. Thanks