I've been getting a click at the top of bolt lift on my 300 win mag. Bolt lift is usual until it gets 90% to the top then I have to push real hard and it "clicks or pops" and it opens fully. Brass is not indicating excessive pressures. I was told the chamber was reamed too tight near the base of the case and needed to be polished out .002. Does this sound right to you?
Gunsmithing Polish back end of chamber
- Thread starter jsthntn247
- Start date
It does it on all brass, new, resized, Winchester, and RWS. Looks to be getting full cam, so that's not it.
Need a little more info - new rifle? Has it always been like that? Problem first showed up when what changed?
Change or adjust the trigger just before it happened? Disassembled the bolt? Had an action truing job done?
That dreaded bolt click, can have a number of causes, some of which are easy fixes, some, not so easy.
Change or adjust the trigger just before it happened? Disassembled the bolt? Had an action truing job done?
That dreaded bolt click, can have a number of causes, some of which are easy fixes, some, not so easy.
I agree with this, and even then, without seeing it in person, all anyone can do is take a good guess.
Does new brass have this click? I am assuming not, and if correct the cause is that you are running hot reloads and the resizing die is not sizing the brass adequately. The cure is to get a better fitting die, or toss the brass and run lighter loads. One option would be to look at the collet sizing die from Innovative Technologies - Reloading Equipment
Just had a full truing job and a Krieger hung on it. The brass gets a light color (like its in a bind) ahead of the belt. Gunsmith said he sees it often in magnums and polishing 1/2 to 1 thousandth out of the rear of the chamber will fix it.
Ah, more is revealed.
Since you've had a truing job, you now likely own a small retiming job also. You've a lack of extraction, since the bolt face is now in a differnent spot, relative to the front of the action ( lug bearing surface), lugs and cam.
A couple different ways to fix - move the bolt handle, to restore the correct angles, or fix the camming surfaces. The cam is off by the amount of rotation it takes to move the bolt the distance that was represented by the lug surfaces removed.
Here is a good video about timing and truing:<
http://www.onetruemedia.com/shared?...kin_id=601&utm_source=otm&utm_medium=text_url
I would not polish the chamber - that is fixing the symptom, not the problem, and your brass may not live as long either. If the reamer was standard SAAMI, how did it cut "too tight"???? Reamers cut big when not right, not "too tight". If he can demonstrate how a reamer cuts "too tight", I'd like to see it.
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He only laps the lugs to contact, usually 2 thou. I thought it was a calming issue myself. However the bolt handle is not far from the action like I've seen in some retiming videos. The handle contacts the ramp of the action right at the bottom and seems to be getting full cam and extraction. I really don't know how to tell if its a caming issue it chamber issue. I have 3 grand in the rifle, it shoots great and I don't want to mess it up for sure.
