by Gwion » 10 Apr 2017, 2:30 pm
Weight of the casing for any given cartridge is likely to be heavier for a smaller internal capacity. This also means that the walls/webbing may be thicker and there fore stand slightly more pressure. ADI brass is known to be heavier duty in both weight and pressure tolerance than many other factory offerings. None of this is a guarantee.
If you are changing any part of your load recipe, i would be inclined to back off and do a quick re-working of the load. How much i would back off is entirely due to how close i already was to a book max load and what cartridge i was loading. Say, for 7-08 i might knock off 1 grain and work back up in 0.3gn increments, for 223 i might back off 0.5gn and work back up in 0.2 increments looking for any sign of pressure. I would load 3 rounds per increment to get a hint of an idea of accuracy. All goo, i would then just confirm the load as previous.
Mind you, doing all this takes me about 1-2 hours in the back paddock and not a week having to load and drive to a range to test, etc, etc....
If you are well back from max load, it is probably fine just to load 15 rounds, shoot 3 groups of 5 to confirm accuracy and check pressure signs before doing a full rework but the likely hood is that a different case will have some effect on accuracy. Is it enough to bother you? that is entirely up to your own standards or expectations of performance. Me??? I reckon i need all the help i can get so i try to have my load and rifle shooting spot on.