RE: Rookie mistake - What did I do wrong?
Bigcountry's suggestion is good one if you are looking to seat bullets to have a minimum of one bullet diameter in the neck. However, what distance are seating your bullets off the lands? I normally try and start at 0.010" off the lands and see what my COL is. If it's within maximum, I load a few and see if the cartridge will chamber easily (in other words, not jamming the bullet into the lands). If so, I'll shoot this load and check pressure signs, velocity and accuracy. If none of the above are what I want or need, I'll adjust seating depth up or down 0.010" until I find what I'm looking for, as long as I don't exceed COL or have less than one bullet diameter seated in the neck.
In short, just because the COL for my .30-06 is 3.34", doesn't mean that I want all my cartridges (with several different bullets) to measure 3.34". In your case, as long as you have at least 0.28" of your .277 bullets in your case necks, experiment with seating depth and see if it has a profound affect on accuracy. My Savage model 110E .30-06 likes a little freebore with 165-grain Nosler BT's; my Winchester Model 70 .30-06 does not!
Brian
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