Okay, I know I'm going to get hammered for this but this is a personal bugbear of mine so II have to say it (!), why feed deer?
Firstly, all you are doing is concentrating deer in one place feeding off the same substrate - with the risk of transmissible disease such as TB and CWD - why take the chance?
Second, you are interfering with the carrying capacity of the land - it is going to increase the winter survival rate so that at other times of year there are going to be more deer around damaging regrowth etc. given muntjac are a non-native invasive species which will strip out the base layer, I really have to ask why feed?
Lastly, if there are hungry looking deer, don't feed them, cull more (I understand that there might be difficulties in hitting cull targets, but you get my drift)
To me there are no benefits and significant risks (low frequency, high impact) - so IMHO, talk to your landowner about other options.
(I will now get my crash helmet on and wait for incoming!)