Jerry, that's the point. People have identified "modern" loads from Winchester, Remington and Federal that are under the Parker service load averages on p. 515 of TPS. Then there are the high weight, high powder loads sold as Express, Black Cloud, Golden rack 'em or whatever pheasant loads that are not new but have been around under various names since the 1920's. These loads were not appropriate for most Parkers then and not now. "Modern" tells me nothing, just as a person asking you if they can catch fish with a bamboo rod. You're not going to go after a tarpon with a 4 wt......just match the load to the instrument.
If you can figure out tippet size, leader size, fly line, DT, WF, etc and fly size relative to rod weight and fish size, a person can certainly understand shot and powder charge and be match the load to the gun.
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