Thread: Who says ADI max loads are soft

Here you go:
.300 RUM.
210gr SMK (#9420), 99.9gr AR2218
Spec: 64,842psi; 3072fps
3mm Over:61,457psi; 3027fps- to get this back up to 3072fps you would need to use 101.2gr AR2218
3mm Under:68,673psi; 3119fps
- Of course seating depth will have a greater impact on a chambering where the caliber to case capacity ratio is greater, because a change in seating depth changes the combustion chamber size by a larger percentage. I.E. your 9mm.

CUP or psi doesn't matter, there is still a limit right? Too much is still too much?

There is 0.30 grains of total H2O difference in SAAMI case capacity between .223 and 5.56

I realize ADI data is for a shorter projectile, hence why I gave data for the 69gr Sierra used by ADI, consequently even with that projectile and a charge of 2206H 0.5grain under stated ADI max, QL still suggests that would generate a chamber pressure in excess of 72,000psi

24gr AR2206H behind a 70gr Berger VLD could give around 62214psi in the 5.56 chambering.

QL should not be taken as gospel (and neither should what I say) but when predictions correlate with real world observations it adds weight to what was predicted. Like in this case. Perhaps @gimp might test for us a 69gr Sierra at max ADI loads and see if he gets another stuck case or some other high pressure sign? My guess is he wont be game enough to 26gr AR2206H (ADI max) behindthe Sierra when QL suggests it generates more than 77,000psi... Would you?