So, did you shoot your loads? How did they turn out? No sooty cases? What was the size of your groups? If you're happy with the results, that's what matters, but you're making it harder than necessary by using a less-than-ideal powder.
IMR-4350 is a great powder for pushing heavy bullets in .30-06, but .30-06 has almost twice the case capacity of .30-30, and it runs at much higher chamber pressures. I wouldn't consider using 4350 for .308 Winchester, let alone .30-30. Picking a powder because you happen to have a lot of it on hand is a terrible idea; a lot of reloaders fall into that trap, then wonder why they get terrible results.
Just because data is published for a given powder/cartridge combination doesn't necessarily mean it's a good choice. A lot of manuals publish data that is borderline usable, just because reloaders like yourself want to use what they have on hand. I'm guessing you're using the Lyman manual, since it matches your data, but did you check any other sources? I try not to use a load unless I confirm it with two independent sources. If you look at the load data on the Hodgdon site (Hodgdon owns IMR), you'll find NO .30-30 load data using IMR-4350. That's right: the company that makes your powder does not recommend its use for .30-30.
The problem with IMR-4350 is it is a medium-slow powder and .30-30 wants a medium or medium-fast burning powder. Slower powders need more pressure to ignite consistently, and .30-30 isn't loaded to very high chamber pressures. It might work fine in 70 degree temperatures, but then give erratic results when it gets down to 20. Another problem is that the max load listed in Lyman (36 grains) is compressed, meaning you may have a tough time getting all that powder into the case without an extended drop tube on your measure or funnel.
You paid good money for those CT bullets. You should really use an appropriate powder so they can do their job.
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