This idea came up a few days ago in #1261684184758489139
There's enough time between maps/weapon packs to completely break down and rebuild one weapon at a time surely, you might be able to do 2 in some cases.
We'll use the Whitlock .30-30 as our example since it needs this almost more than any other weapon.
First step is to completely remove the old code for it and rebuild it from the ground up. The real world performance of this rifle is much closer to the 7.62x54r than .243 and the new code should reflect that.
The basic appearance of the weapon in the inventory and in hand is fine, no changes are really needed except for changing the sights to older buckhorn style rear sights.
The next big change is the scopes it can use. Modern versions of this weapon, and this is a replica according to your in game info, are typically equipped with a rail attached to the barrel where the rear sights usually sit. This could allow the Whitlock to use the Ascent 1-4 scope and red dots while still allowing you to use the lever action specific scope.
This rifle would also be using modern ammunition types, like polymer tipped bullets designed for tubular magazines. Hard cast bullets should be modeled on newer ammunition too.
This would also affect the maximum zero distance, it should be extended to 250 yards with the hard cast bullet having more drop.
The result is a 3-7 class weapon for the base game that's reasonably competitive with the DLC ONLY Solokhin 7.62x54r