I have had a flock of remingtons over the years, they are not hard to tune with
55g hornady flat base lead tip
55g V max
Sierra 55g flat base55g BTHP
55g spt BT
55g Semi point
55g Nosler Ballistic tip
63g Sierra semi point
60g Sierra Hp
With all loads, the very best accuracy was with the bullet just barely touching the lands or the bullet .005 off. The use of a boat tail bullet will eventually leade you to go to a flat base bullet, then a longer bullet to touch the lands with the bullet where best accuracy is achieved. Sub 1/2" groups were the norm.
55g loads,
imr or H 4985, 34-35.5g stop if you see pressure and play with different primers once you find the charge your rifle likes
IMR 4064 with 55g, 34.5-35.5 usually hits a home run
60-63g Max load of IMR 4350 will be in the 3450 fps area.
as the leade gets worn, the 55g and 63g Semi point will shoot very small groups, and brother do they hammer coyotes. Accuracy with the 55g Semi point is like a 52g Berger match, so is the 63g Semi point, and the 63 stabilizes very well in the 14 twist. I had one Howa Varmint that had a leade so long, I had to go to shooting the 60g HP and the 63g Semi point in the new rifle. The rifle shot very tiny groups with the 60g and 63g with IMR 4350, primer choice was picky.
The highest velocity, with extreme accuracy was with a 55g NOsler combined technology bullet at 3850 shooting between 1/4-3/8" groups, consistently. Using 41.5g of Win 760, 400 yard groups were nothing short of awesome in the 1 1/2" area. The black coating on the C/T bullet reduces friction and allows to shoot some hotter loads with accuracy. Work up to this load in your rifle and don't even try this load with Naked 55's in your gun. Normally, 38.5g is almost a max load with Winchester 760 with a 55g, but the Lubalox coating does reduce pressure, and the accuracy node in my 26" varmint was at 41.5g.
In all cases with the Remington 700's, the very best accuracy was achieved with the bullet touching the lands, barely or .005 off the lands, I cannot stress this enough. Learning to measure the OAL to the .001 with repeatability is critical for this kind of accuracy.
I like to neck size when ever possible and bump the shoulders with a std Forester/bonanza neck sizer to keep from full length sizing as much as possible.
Lots of people spread the word that the Remington 700's with a 14 twist will not stabilize a 55g bullet, and with the dozen or so that I have owned, I can not recall ever shooting a 50g bullet or lighter. Not to mention the customs that I have had with 14 twists and only shot 55's, 60g, and 63g in.
There are two bullets that will not stabilize that could be confused in the Remington 22/250 with the 14twist, the 53g Hornady V max, and the Sierra 55g Blitz king plastic tip that is a very long bullet. Some barrels will stabilize the 55g Blitz king and some will not.
This hornady product is your best friend:
http://www.midwayusa.com/product/709931/hornady-lock-n-load-bullet-comparator-body
http://www.midwayusa.com/product/727771/hornady-lock-n-load-bullet-comparator-insert-224-diameter
Split a case neck with a dremel tool, measure off the ogive of the bullet only as tips can very .030 and more
The guys that master this OAL measuring technique are rewarded with amazing accuracy, and I hope the original poster gets his rifle pillar bedded...money well spent or invest the time to learn to do it yourself, even better.
I want to try some super performance powder with the 55's, it may be spectacular.