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The load might not be quite as accurate seated that far from the riflings, but you will just have to check it out on the range to see. You will see a slight drop in mv too, as you seat them deeper.

You don't haver to worry much about increased pressures either, because a rifle develops its' max. peak pressure only after the bullet is 4 or 5 inches down the bore!! In a pistol cartridge, things are a lot different, and the powder is a LOT FASTER!!

Keep yore powder dry!!

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I only have one rifle that I can seat the bullets out anywhere near the lands while allowing the cartridge to work in the magazine or the bullet to actually be seated at all in the brass. Just seat the bullet so it functions in your magazine, and don't worry about it. You might lose some accuracy that can be had by seating closer to the lands, but I've found that using a Lee factory crimp die helps gain some of this lost accuracy back.

Alcohol, Tobacco, and Firearms... who's bringing the chips?

You know what I found out here in the last year is loading close to the lands always don't get you the best accuracy. For a long time now, I have been fighting to get my 200gr Swift A-frames to shoot out of my 300RUM. Specs says 3.6" max COL, but i have been trying 3.640". Tried several primers, several powders with no luck. So on the advise of Sierra's tech support I loaded it down much deeper. In fact, deeper than factory loads down to 3.52". You know what happened? At 200 yards, my groups went from 5" to 1". I was blown away. I didn't do it once but 3 out of the 5 groups. So I have found that worrying about being close to the lands is a big waste of time sometimes. So when working up a load, I start out short COL and work up from there. I usually start out the length of factory ammo which should be no problem with 3.310". I believe you get much more repeatable results when doing it this way. When I used to load extremely long, I would sometimes get clover leaf groups, but when the weather changed to hot, I would lose my groups or if it cooled down. Also found the groups not to change so drastically with changing charges with this deeper loading. For example this weekend, my groups at 200 yards went like this. Usually when loading out real far, they would change much more drastically.

85gr 2.0"
86gr 2.0
87gr 1.5
88gr 3" (not sure what happened here)
89gr 1.0"
90gr 1.1"