Any issues with these cases - Pressure Signs
- Thread starter CanMike
- Start date
- Location
- Nova Scotia
Primers still got a round edge. Ive seen them completly flattened, and squared.
But is the firing pin dent, is it raised on the edge or flat?
But is the firing pin dent, is it raised on the edge or flat?
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Cocked&Locked
CGN Ultra frequent flyer
- Location
- S. Ontario
The primary indicator to me is primer flattening. The radius around the perimeter will disappear to some degree if the pressure is excessive.
There is none of that here.
There is none of that here.
- Location
- Saskatoon Saskatchewan
That really depends on the primer. I've had ejector swipe and sticky bolt lift with cci primers that still had nice round edges. Federal primers on the other hand will flatten out nicely before any other visible signs of pressure.
You don't mention the powder or bullet weight, but you are running about what the max is for 6.5cm and 140's for velocity with the ideal powders.
Don't buy into Internet loads where the 6.5cm can hit 3000fps with 140's and not be over pressure.
Sorry I thought it was higher up.. But was in a different thread.
6.5 Creedmore with the new Lapua 144 Match Target Bullets
Cadex - CDX-R7 Action
24" Barrel
H4350 shot strong from 39.4 - 40.9 grain
I was shooting the Hornady ELDMs (Factory Load) and these are shooting 2750
Mike
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You got a little room left, but not much buddy, settle on 2650-2700fps, your brass will let you know, when primers start seating with no effort on reloading that brass is when you know you should go lower.
Regular healthy pressure, should get 10+ loads out of decent brass like that (not Federal don't bother using that stuff).
If you are hitting stretched primer pockets after 3 or 4 loadings, dial her back a bit.
Yes 100%. No intention of going nuclear with this load. 2700 and I’m happy.
There may be a mode around 2740-2750 but that will be on the limit so no point going after that.
I think I’m going to try 41.4 / 41.5 / 41.6
These are also jumping 20/30 thousandths
Mike
There may be a mode around 2740-2750 but that will be on the limit so no point going after that.
I think I’m going to try 41.4 / 41.5 / 41.6
These are also jumping 20/30 thousandths
Mike
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- Location
- Saskatoon Saskatchewan
Whats your barrel length? I was at the range with my 6.5 creed 20" today and I'm getting 2700average with 41.7 h4350 and lapua brass. Cci br2 with no pressure signs. So youre data seems to line up right close to mine.
The very slight "cratering" you see around the firing pin indent is normal for some primers.
Even flattening of primers can be OK, depending on the primer.
Commercial primers, intended for handloaders such as ourselves and the other knowledgeable people who answered you, tend to be softer.
Many of the primers available recently have been made to military specs, and they tend to be harder. When you get primer cratering, combined with extreme flattening, then it's a pretty good indication of high pressure.
The best way to check for pressure signs is to measure the diameters of the case, just in front of the extractor groove. If you're getting expansion of more than a few thousandths, you're getting high pressure.
Primer flow should only be used as an early indicator, but because of differing hardness, and thickness, it can be misleading.
Good on you for asking for verification.
Even flattening of primers can be OK, depending on the primer.
Commercial primers, intended for handloaders such as ourselves and the other knowledgeable people who answered you, tend to be softer.
Many of the primers available recently have been made to military specs, and they tend to be harder. When you get primer cratering, combined with extreme flattening, then it's a pretty good indication of high pressure.
The best way to check for pressure signs is to measure the diameters of the case, just in front of the extractor groove. If you're getting expansion of more than a few thousandths, you're getting high pressure.
Primer flow should only be used as an early indicator, but because of differing hardness, and thickness, it can be misleading.
Good on you for asking for verification.
Primers are poor indicators of excessive pressure. Slight head clearance or headspace of the cartridge will produce flattened primers when the pressure is perfectly normal.
If extraction is easy, pressures are not excessive. The first sign of harder extraction - that indicates excessive pressure.
If extraction is easy, pressures are not excessive. The first sign of harder extraction - that indicates excessive pressure.
Craters are caused by over length firing pins and over size firing pin holes while the pressure is low enough to leave a rounded primer edge. It looks like you’ll get a big crater at high pressure. Wear shooting glasses and keep your fingers away from the blow hole on the side of the action as you pressure it up.
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