Ok Kiwi,
I was surprised how accurate those cheap scales appear to be, having also done a few test weights. I bought a kitchen set from the 2$ shop(?) for $15, and two ebay gold weighing sets for 'bout the same total.
My flat top +40 Hepolites are 359 & 361 grm, so that's about the same, pin I.D seems tapered,0.545 at ends.
I have 4 BSA 8.5 +20's (various pins),1@ 341g, 2@344g,1@355g(comp.w rings & pins).
I'd been led to believe that JP's were 'heavy'(bit more than their guess 343<-360), but seems no more than what I'm using, funny thing with JP is domestic freight is same as international, so doesn't matter if I buy them from O/S.....?
Anyway, Michael, I'd say if you just like to trek around and keep your license, the 7.25's sound the go, it's what I have and shall stick with. When it ran before, it got along just fine.
Cheers for now, duTch
ps Kiwi am still working up to B/F