Lyman 48th Edition shows 18.8gr IMR-4227 start / 23.5 max for 200gr JHP in the Contender loads
Speer 10th Edition shows 17.0gr IMR-4227 start / 19.0 max for 200gr JHP in the standard loads
I wasn't able to find any data for 200gr LSWC (or any other 200gr lead bullet) using IMR-4227.
In fact, although I suppose I could have missed one, the only load I saw using IMR-4227 with any lead bullet was:
RCBS Cast Bullet Manual #1, 19.5gr IMR-4227 start / 21.5 max for 225gr LRN
From all indications this is a light load, but if it were me I would pull them if I couldn't find a published load from a reputable source that confirmed it was safe.
Just a Shooter