PSI vs. FPS is more than a "clerical" error. PIS(S) and UPS would be clerical or typographical . It is a substantial error. There are numerous loads that bump up to SAAMI maximum pressures that fall below 1200 fps. As for chamber lengthening .25" over 2.5" can be enough to blow chambers in some guns shooting modern loads with pressures not consistent with the gun's mfg. For instance, some Fox guns, especially 16 ga. Lengthening a double's chambers by a reputable smith who is capable of measuring wall thickness is one thing, but not all smiths are created the same. But see Sherman Bell's study of shooting 2.75" ammo out of short chambers. Pressures didn't increase substantially, but more than likely they weren't maximum SAAMI. Gil
Last edited by GLS; 11/06/25 01:38 PM.
