The plated bullets are "ok" for low velocity loads such as a "non-gaschecked" cast bullet. The plating eliminates the need for a lubricant such as SPG or 50/50 alox-beeswax.
Because it can come off the bullet if pressures or velocities are too high, it can't be pushed, in the case of the .30/30 much past 1,500-1,700fps with good results.
HOWEVER; for your stated purpose of using IMR-TrailBoss, it'll be quite a good match of application.
I've never used such bullets in the .30/30 but from experiences with other similar components in different caliber/applications I think that you'll be satisfied with the results.
Personnaly, I cast my own bullets to include those I use in the .30/30; in fact my first casting efforts were with my still favorite mould for it, the Lee 150gr FNGC. I size these to .311" and with a Hornady crimp-on gascheck and lubed they run 157gr with my current mould. My brother has my original mould and it runs 160gr. A perfect match for the .30/30.
I prefer 30.0gr to 32.0gr of RL-15 for about 2,200fps. It gives MOA accuracy from my Marlin/Glenfield M30 and has taken a number of deer and pigs.
At the recommended charge levels for TrailBoss, your component selection will perform nicely and with the copper coating, there will be no need to clean any jacketed bullet fouling from the barrel and then re-condition it to the cast lead bullets.
