"Dynamic Fit" wasn't even thinkable.
The back story is that it was Lyman's answer to the Belding and Mull and Modern Bond designs of the Miller-Squibb bullet. Those two guys from Long Island spent years working on the best 200 yard bullet for the 1903 Springfield. Since it only had to do 2 MOA, but feed 100% of the time, this is what they came up with for the design. Yes, I know, old time thinking (the scraper band was suppose to reduce bore fouling) and big lube grooves for lots of "Banana Lube" for their 15% antimony and 10% tin alloy. "Dynamic Fit" wasn't even thinkable. Still, if you can mechanically fit and align it to the throat, it isn't a bad subsonic plinker.
Well, they didn't get bent. Another common alloy was 18% antimony with no tin. Lots old stories of buying block antimony and pulverizing it with a hammer, grinding it and covering it with charcoal and trying to dissolve it with the lead on natural gas burners. The "common knowledge" then was that if you made the bullet hard enough, it would straighten out in the barrel. Plus they were not straight in the chambers either when fired. Remember that military shooters didn't require anything over 2 MOA, unlike the Schutzen crowd that was doing about one and a quarter MOA at 40 rods.15% antimony and 10% tin?? Hijo la, how did those bullet ever get bent outta shape?