Thread: ADI book max’s

Right I’ve just finished. Settled on 26.5gns of 2206H. A little over max but no pressure to speak of. I wanted more speed to at least have 800 ft/lbs of energy at 300 yds which is the self imposed limit with this rifle.

Originally Posted by Nathan F

Right I’ve just finished. Settled on 26.5gns of 2206H. A little over max but no pressure to speak of. I wanted more speed to at least have 800 ft/lbs of energy at 300 yds which is the self imposed limit with this rifle.
Attachment 195062

Good work now for the animal test.

Sent from my CPH2145 using Tapatalk

Originally Posted by 25/08IMP

Good work now for the animal test.

Sent from my CPH2145 using Tapatalk

Hopefully next weekend wx dependant

Originally Posted by Nathan F

Right I’ve just finished. Settled on 26.5gns of 2206H. A little over max but no pressure to speak of. I wanted more speed to at least have 800 ft/lbs of energy at 300 yds which is the self imposed limit with this rifle.
Attachment 195062

Greetings again,
That is impressive velocity, much more than I would have expected. To be on the safe side you may wish to do a little test. Take two of your cases fired with that load and load and fire them ,with the same load, two more times. If the cases will still hold a primer after that then the load should be fine. If not then a re think is needed. A friend developed a cracking good load for one of his rifles. Great velocity, wonderful accuracy and no signs of pressure. Life was good. Unfortunately none of his new cases could be reprimed due to loose pockets. Rifles have been blown up with loads that showed no signs of excess pressure, one of the reasons I tend to use velocity as an indicator of pressure.
Regards Grandpamac.

Originally Posted by grandpamac

Greetings again,
That is impressive velocity, much more than I would have expected. To be on the safe side you may wish to do a little test. Take two of your cases fired with that load and load and fire them ,with the same load, two more times. If the cases will still hold a primer after that then the load should be fine. If not then a re think is needed. A friend developed a cracking good load for one of his rifles. Great velocity, wonderful accuracy and no signs of pressure. Life was good. Unfortunately none of his new cases could be reprimed due to loose pockets. Rifles have been blown up with loads that showed no signs of excess pressure, one of the reasons I tend to use velocity as an indicator of pressure.
Regards Grandpamac.

Hmmmm- just to put some more context around what @grandpamac is saying - if I run this load in GRT ,it predicts 2961 fps with my cases, which have a middle of the road 30 grains of water capacity. Pressure is indicated at 69030 psi, SAAMI max for 223 is 55,000 psi. If you get a case with a bit less capacity or a weak case someone could get hurt . . . .

Originally Posted by grandpamac

Greetings again,
That is impressive velocity, much more than I would have expected. To be on the safe side you may wish to do a little test. Take two of your cases fired with that load and load and fire them ,with the same load, two more times. If the cases will still hold a primer after that then the load should be fine. If not then a re think is needed. A friend developed a cracking good load for one of his rifles. Great velocity, wonderful accuracy and no signs of pressure. Life was good. Unfortunately none of his new cases could be reprimed due to loose pockets. Rifles have been blown up with loads that showed no signs of excess pressure, one of the reasons I tend to use velocity as an indicator of pressure.
Regards Grandpamac.

The rifle blowups I'm aware of have all been the result of either using the wrong powder accidentally, or an obstructed bore.

How do we really define "safe" ?

A Tikka T3 action (as here) with .223 surely must have a huge safety margin of action strength, well in excess of where the brass will fail.

The real risk here would be risking a case failure (which is hazardous in itself - especially in a T3 with the plastic bolt shroud which fragments in this event) if reloading these cases multiple times, or simply that your brass will be more or less single-use.