Originally Posted By: 2-piper
Originally Posted By: GLS
Stan,
Jay's still a nice guy to talk with. wink
It's always seemed counterintuitive (to me, anyway) that the smaller the bore (excepting 12 ga. 3.5"), the higher the SAAMI spec.
Gil

Gil; Nothing amazing about that. The smaller the bore (Except for that 3˝" 12) the heavier folks want to load it in relation to bore size.
To get a really good low pressure load in 12ga one usually loads one(1) oz. A proportional load in .410 would be 5/16oz yet almost everyone with a .410 wants a 3" shell carrying 3/4oz of shot or at least 11/106 oz if they use a plastic shot cup. Even the lowly ˝oz .410 load is proportional to the 3" 12 with 1 5/8oz shot yet its crammed into a 2˝" shell.
Pressure is not just proportional to the weight of shot being pushed, but to the weight of shot in relation to the size hole its being pushed through & of course to how fast you push it.


Miller, it IS amazing, because pressure is not directly proportional to payload and velocity. I know that you are aware of that. The manufacturers could still load .410s at the same velocities, with the same payloads, but at lower pressures, if they wanted to. The "technology" is there to do that.

SRH

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