Over pressure

[kransky93]

Just wondering if someone could confirm if this is primer cratering or not?
Thanks guys

[JohnV]

No not really a true pressure crater . Some bolt faces have a bit more clearance between the firing pin and the hole so they get that slight ring even when pressures are quite safe . Also softer primer cups will also help the ridge form . The outside radius on the primer cup is still well rounded that also indicates a safe pressure as the whole primer face has not been squished flat which would indicate higher pressures . The primers show some flattening so pressure is getting up there but still safe .

[Billo]

Look OK from here

[kransky93]

These are some factory loads I have shot in the past and they don’t seem to look the same.

I had reloaded some other loads with the same primers but with 1 grain less powder and they didn’t look like the primers in question

I’m new to reloading so just making sure that’s all

[deye243]

Edges of primers still have a radius so all good .
Have a look at these they are mild loads but it as the wrong diameter fp and the fp hole needs to be sleeved

Screenshot_20230805_211605_Gallery_copy_768x1647.jpg (220.68 KiB) Viewed 2487 times

[JohnV]

Those brassy looking primers are most likely Remington and they have hard cups . So they will take more pressure . If you look closely you will also see the firing pin indent is also shallower . I am not seeing anything unusual or unsafe .
Staying in a safe pressure zone is also a function of staying with powder recommended loads and not chasing max pressures especially while you are learning . If your loading manual says it's a starting or just a bit above starting load and the primers also look good and the empty case has no bolt lift problems or extraction problems . Then you are good to go .

[bladeracer]

I'm not seeing any indications of pressure there.

[kransky93]

The loads is
Ar2206h 25.2gr
55gr vmax
C.O.L 2.250

[JohnV]

That is .2 grain over the ADI recommended starting load for 55 grain bullet and AR2206H . If it groups well then that's a good load to learn with and your cases will last longer . The actual COL does not mean that much as far as pressure goes .
What is more important is that the COL will fit any magazine in use and the bullets ogive will not be jammed into the lands when you chamber it . Many people even experienced reloaders think that seating a bullet out will lower the max pressure achieved . It don't . The dimensions of the case capacity and the start of the rifling always remain the same no matter where the bullet is seated so pressure spikes when the bullet enters the bore not while it's moving out of the case neck . So the volume seen by the initial pressure spike will always be the same even if a slow burning powder reaches a higher pressure down the barrel the volumes it sees will always be the same for the same bullet . Slight volume changes can happen using miss matched bullet shapes .

[kransky93]

Appreciate the info
I wanted to just make sure as once I’ve seated the bullet I can’t hear any powder shaking around and I thought maybe I was going a bit too high
Thanks again

[deye243]

The loads is
Ar2206h 25.2gr
55gr vmax
C.O.L 2.250

This load will only develop around 3100fps if your lucky so you have a LOT of room for improvement if you wish .

[JohnV]

All good mate you have a good attitude for reloading and you will do well . Don't get caught up in chasing velocity it's a waste of time and money . Chase accuracy and reliable functioning not max velocity .

[stihl88]

223 - 55gr.png (179.26 KiB) Viewed 2423 times

25.1gr is the upper limit for this powder using the 55gr pills.

[Oldbloke]

stihl88,
Can I ask where that data comes from?

[deye243]

Hornady and imr4895 is not the same as 06H ...... H4895 is

[Oldbloke]

Hornady and imr4895 is not the same as 06H ...... H4895 is

Good pick up.

Hodgdon-Powder-and-ADI-The-Australian-Connection-10-ADI.jpg (174.35 KiB) Viewed 2406 times

Resized_tempFileForShare_20230806-141041_47098429072037.jpeg (222.16 KiB) Viewed 2406 times

[deanp100]

I’ve just loaded 25.1 and 25.3 gr of 2206h. 3030 and 3060 FPS respectively. Heaps of room to go.

[kransky93]

I’ve just loaded 25.1 and 25.3 gr of 2206h. 3030 and 3060 FPS respectively. Heaps of room to go.

Stupid question but how far up the brass does that come up to?

[deanp100]

I’ve just loaded 25.1 and 25.3 gr of 2206h. 3030 and 3060 FPS respectively. Heaps of room to go.

Stupid question but how far up the brass does that come up to?

About half way up the shoulder if I remember correctly.

[deye243]

I load 26 for 3242 wich is a mild load and it sits just below the neck shoulder Junction in rem and adi brass .
Case on the left was dumped in the funnel the one the right was pored in so there was no bunching in the funnel.

Screenshot_20230806_182531_Gallery_copy_768x1647.jpg (233.62 KiB) Viewed 2383 times

[kransky93]

Beauty, thanks for that fellas

[JohnV]

As I said before the primers indicate that the pressure is getting up there but is still on the safe side . If that shoots ok then no need to increase powder charge . It is still cool weather now and later in Summer the pressure will rise slightly anyway . ADI is " Less "pressure sensitive than some other powders but not " Immune " to extra heat .

[deye243]

Not my experience in 40 years of using this powder and it's predecessor 2206 gets down to to -3 at times and the hottest I have used this powder is 37 nowhere near how hot it gets in summer but no problems.
Now I understand the caution thing but stop telling this bloke to load his 223 to less than 222r velocity.
This is the reason I like US forums they know how to hand load not reload .
Every rifle is different .

[stihl88]

Hornady and imr4895 is not the same as 06H ...... H4895 is

Correct but it is equivalent and I only have Hornady load data on hand, refer to ADI chart > http://www.adiworldclass.com.au/powder-equivalents/

ADI Powder Equivalents.png (58.83 KiB) Viewed 2336 times

[bladeracer]

Hornady and imr4895 is not the same as 06H ...... H4895 is

Correct but it is interchangeable and I only have Hornady load data on hand, refer to ADI chart > http://www.adiworldclass.com.au/powder-equivalents/

ADI Powder Equivalents.png

Equivalent does _not_ mean the load data is interchangeable, it means the powders are designed to operate within similar parameters.
But, for all practical purposes I don't think there is much if any difference between H4895 and IMR4895 load data.

[bladeracer]

Not my experience in 40 years of using this powder and it's predecessor 2206 gets down to to -3 at times and the hottest I have used this powder is 37 nowhere near how hot it gets in summer but no problems.
Now I understand the caution thing but stop telling this bloke to load his 223 to less than 222r velocity.
This is the reason I like US forums they know how to hand load not reload .
Every rifle is different .

I'm the opposite, I find Americans generally are less inclined to actually experiment, with anything. There are certainly people that will push the boundaries, but overall US forums tend to have lots of "if it's not published data it's unsafe" types.

[in2anity]

Can confirm, it's not. I bet it's just a howa.

[kransky93]

Can confirm, it's not. I bet it's just a howa.

Lithgow la102

[in2anity]

Lithgow la102

Is there a difference in firing pin size between small rife and large rifle la102s? The factory howas use the same size, so it's a bit large for the little fellas, and often will yield that outcome. Truth is, a lot of guns running hot, will yield that. Heck I've seen brand new Sakos do that.

[stihl88]

Hornady and imr4895 is not the same as 06H ...... H4895 is

Correct but it is interchangeable and I only have Hornady load data on hand, refer to ADI chart > http://www.adiworldclass.com.au/powder-equivalents/

ADI Powder Equivalents.png

Equivalent does _not_ mean the load data is interchangeable, it means the powders are designed to operate within similar parameters.
But, for all practical purposes I don't think there is much if any difference between H4895 and IMR4895 load data.

My bad, I meant "equivalent", they're different powders with slightly different burn rates...