Primer seating (Read 1297 times)

JunUButay

Primer seating
« on: November 11, 2022, 09:11:10 PM »
Using CCI #400 LARGE RIFLE PRIMERS in one fired Federal 6.5 Creedmoor brass.

Primer pockets are cleaned and uniformed.

When I seat primers, they are not flush and clearly rock when sitting them up.

What are your thoughts?

Lihikai

Re: Primer seating
« Reply #1 on: November 11, 2022, 09:51:14 PM »
Most of the time you can feel when the primer is fully seated.  Some primers are known to be tight, but the #400 in not one of them.  Try pushing harder to seat the primer deeper.  Wear eye protection.

ren

Re: Primer seating
« Reply #2 on: November 12, 2022, 07:49:12 AM »
any pics? What tool are you using to seat them?
Deeds Not Words

Rhed

Re: Primer seating
« Reply #3 on: November 12, 2022, 09:10:44 AM »
Well that’s weird.. I use to have a problem crushing primers. LRP or SRP. And my sd numbers was all over the place. What kind of brass are you using?

Hi state

Re: Primer seating
« Reply #4 on: November 12, 2022, 12:00:39 PM »
Cci #400 are small rifle primers. But in case that was a typo measure your primer from anvil to top of cup and measure the depth of your primer pocket that will tell you if you need to crush the primer to seat them flush. FYI Saami spec on larger rifle primer thickness is min-.123” max-.136” primer pocket depth from case head is supposed to be .125”-.132” I need ~.005” crush with Peterson brass and 210m primer to get it to seat flush~-.001”

macsak

Re: Primer seating
« Reply #5 on: November 12, 2022, 12:21:53 PM »
heads

Cci #400 are small rifle primers. But in case that was a typo measure your primer from anvil to top of cup and measure the depth of your primer pocket that will tell you if you need to crush the primer to seat them flush. FYI Saami spec on larger rifle primer thickness is min-.123” max-.136” primer pocket depth from case head is supposed to be .125”-.132” I need ~.005” crush with Peterson brass and 210m primer to get it to seat flush~-.001”

spicynoodle_1

Re: Primer seating
« Reply #6 on: November 28, 2022, 07:41:35 PM »
Maybe there’s a factory crimp on the brass?