as to how your bolt rifle should be fitted! This is an extraction from an article in reference to proper bolt timing!
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Over the last twenty years I have had customers send me their Remington 700(s) to have them re-barreled . Some want them trued up some don't and some think they already have had them trued up. There is a difference in a "Trued action and a Trued and Timed action".
I have found that Many customers and gunsmiths really don't understand the meaning of Truing and Timing actions.The lapping of bolt lugs in most cases just makes the problems worse. Not saying I am an expert, but I personally don't think the current management at Remington understands "bolt timing" either. Since the Shot Show I have had about 25 customers "NEW" Remington 700(s) in my shop and most of them had little or no primary extraction. It seems the newer models are some of the worst cases. I recently went to the Biggest Sporting Goods Chain in America, I looked at every New Remington 700 they (approximately 25 guns) had up at the counter. From .223(s) Standards, and Magnums all in my opinion had "primary extraction issues" The bolt handles were between .052" and .059" clockwise out of timing. I called Remington Corporate three times trying to address the issues. On the third time I spoke with one of their "Gun Smiths", he got an action and I walked him through how "primary extraction" is supposed to work, at least how Mr. Walker (Remington 700 designer) intended them to work. The Remington Gun smith said he took notes and would report to his superiors what I had brought to his attention. I have not heard a word from Remington and don't expect to.
This week I received four PT&G two piece bolts. Following Dan Armstrong's Instructions to the letter, I Timed the new bolt handles and bolt bodies, then TIG welded them on. With a little filing and clean up they are a much improvement. Now when the bolt handle is lifted from battery and reaches the end of the helical to go into the bolt race the camming angles on the action and bolt handle engage and further the primary extraction until the cocking piece reaches its cocked position..
Today what was disturbing to me one of these actions had "already been Trued and Timed" by another "Reputable Rifle Smith". He went to the trouble to install a M-16 extractor, and Bush the bolt before re-barreling the rifle. The customer took the rifle back to the original gunsmith who had charged him a large sum of money for his services. The customer was having extraction problems. The original gunsmith refused to look at the rifle and said their was nothing wrong with it.The customer asked me to look at the rifle and see if I could find out what the problems was. With all the custom work that had been done to the bolt the bolt handle exhibited .032" gap between the front of the bolt handle and the trailing edge of the rear bridge. When the bolt handle was lifted from battery to the point the bolt lugs were out of the helix and into the bolt race the primary extraction cam surface completely missed each other by a good .065". The customer paid good money for crappy work. I have taken pictures of before and after for the customers, that I have addressed the "primary Extraction issues.
If you are going to have and action Trued up and Timed make sure the gunsmith doing your work has a good working understanding of primary extraction. There are some great gun smiths out there who fully understand Primary Extraction. Bolt handles can be silver soldered or TIG welded on, either method will work fine. A properly timed Remington 700 should have between .005" and .010" gap between the handle and the rear bridge. The primary extraction cams should meet at the point the bolt lugs leave the helix and enter the bolt race. This should be one smooth motion with no clicks. When the bolt has reached the end of the extraction cam the cocking piece should have found its home in the notch in the bolt body. If it is timed correctly the cocking piece will pass through the cut in the tang.
Nat Lambeth
Go here to view the photos:
http://forum.accurateshooter.com/attachments/remington700sa_01-jpg.947326/http://forum.accurateshooter.com/attachments/remington700sa_308_01-192-jpg.947328/Lower photo shows the correct way!
