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"Could it be the type of Chamber on the 700 ,which does,nt allow this gauge to work ?"
No. Your gage is working fine and your chamber is fine. You have just found why trying to load with BR methods by seating to the lands rarely works with factory rifles with deep throats made so any round ever made can be safely chambered and fired. There is a rarely understood but significant difference between the maximum possible OAL and what is reasonable and what actually works best for an individual rifle and load; all your gage can tell you is the max possible. Few factory sporter rifles shoot best at or really near the lands anyway. If the loaded bullet is seated too far out to feed through the magazine OR if the bullets can be dislodged with normal handling you must seat deeper.
Start by seating as long as practical and develop your best shooting charge, then experiment with seating deeper in 5 or 10 thou steps until you find the best OAL.
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