Win94,
I have fired 100's of heavy cast bullets in my lever action .30-30's over the years...... 200 Gr.Lee, 205 gr. Old West, 208 gr. Lyman 311299, 220 gr. Lyman 311284.
My use of these heavier bullets has been for long range shooting at steel targets.
My powder of choice is slow burning H414 with H4350E a close second using WLR primers. Faster burning powders like RL7, 3031, 4895, etc. are ok for lower velocity...1,600 f.p.s. or less but for higher velocity at safe pressures (less than 38,000 cup) in the .30-30, I have found that the slower powders are the way to go.
In a 20" barrel, 1,900+ f.p.s. is possible. In my 1894-1994 Centennial rifle w/ 26" barrel, .30-30 loads w/ H414 pushed the 205-208gr. bullets to 2,080 f.p.s. and the 220 gr. to 2,030 f.p.s. with H414. A ballistics lab pressure tested these loads at just over 35,000 c.u.p.
With your 200 gr. bullets I would suggest starting at 32 grs. of either H414 or 4350 and work up from there.
About 20 years ago the late Frank Marshall spoke about using the 220 gr. 311284 with a .20" flat filed on the nose for those going away "bye, bye buck shots". He reported complete penetration from one end to the other. His powders of choice .....W760 (Same as H414) or 4350.
Have fun!
w30wcf