help, bolt not wanting to come out

[1denogean]

my 7mm just started giving me problems and i need some help from LRHM, i only have 25 rounds through it, brand new and just broke in. Well just recently, i shoot and then the bolt lets me lift it up and does not want to let me pull back, ( it will open with alot of force) its not effecting the accuracy at all it will shoot 3 bullets under an inch but it bothers me how hard it is to get back. now i looked inside and i can see tiny bits of brass by where they bullet goes in the barrel and there is scuff marks on the brass about 1/3rd of the way up from the bottom of it.

does anyone know what is causing this? it didnt start untill about 22rds in.

i am taking it to a gunsmith today but just curious as to what it is.

 

[aramarine6]

Sounds like seriously HOT loads! Don't put any other rounds down that tube till you get it checked by a competant gunsmith. How does it feed rounds into the chamber? Is it smooth? Or does it require alittle effort to close the bolt?

 

[1denogean]

really really smooth, i was shooting factory federal rounds and it wasnt doing nothing till till the last few so i went and bought a box of core locs and tried 1 and it did the same thing with them

 

[aramarine6]

I guess that rules out Hot handloads. I would take it to a gunsmith asap. They should have the tools to check demensions and make sure that the barrel is properly fitted into the action.... so on and so forth.

 

[sinarms]

Sould be gulling in the chamber or a bad cut chamber. I have seen this happen a few times before. Is it a new Remington?

 

[1denogean]

yes it is, new remington model 700

 

[sinarms]

I'd question the chamber then, I have fixed 2 of them. One was a new 5R 308 the other a 300wm. The 308 was able to be cleaned up but the 300wm got a new barrel.

 

[Coyboy]

not enough primary extraction. if you have enough primary extraction and a rough chamber you would be pulling the rims off.

so that eliminates the rough chamber and means you have little to no primary or cam left between the cam surfaces.

 

[rick523]

Funny you posted this, I am having the exact same issue with a sendero in 308, and I mean exactly the same issue, chambers fine, very easy bolt lift, but a real Bit&* to eject the case, and scratches just as you described, I am taking the barreled action to my gun smith tomorrow morning and he is going to polish the chamber. if this solves the problem I will post and let you know. Other than that it is very accurate, sub moa at 1000+, but is not fun to shoot,in it's present state.

 

[rick523]

not enough primary extraction. if you have enough primary extraction and a rough chamber you would be pulling the rims off.

so that eliminates the rough chamber and means you have little to no primary or cam left between the cam surfaces.

Jim, if that be the case why the scratches, and what would the fix be.

 

[Coyboy]

scratches could be somthing in the chamber, but light scratches or small burs usually does not cause what you guys are describing.

the scratches could also be from;
the feed lips as the cartridge goes into the chamber.
could be the brass rubbing on the upper corner of the lug abutment as they are pushed to the side by the ejector when with drawing the spent case.

pics would help.

A lack of primary extraction is what you guys are describing and 90% of new Remingtons that have been coming out have a very marginal amount compared to the older models. A bolt handle properly placed on the bolt or a new ptg bolt will solve the problem.

The people at remington no longer understand what it takes to make a rifle opperate properly, they just keep turning out a poor product. if they cared it would be a simple fix in there manf process. but they don't care.

 

[rick523]

Jim, the rifle I have is an older model that I traded for from a member here, here is pic of cases one on the left is a fired case one on right unfired note scratches runing the full radius of the fired case. Thanks,

 

[Coyboy]

Rick, those look more like rings?
can you feel them on the brass if you rub your fingernail over them? or are they more visual than "textured"?

It is not uncommon to see rings in brass, if they are deep enough in the chamber the brass will flow into them and cause them to stick. The primary extraction or cam is what gives you the mechanical advantage to pop them loose so the extract easily.

 

[shortgrass]

Rick, those look more like rings?
can you feel them on the brass if you rub your fingernail over them? or are they more visual than "textured"?

It is not uncommon to see rings in brass, if they are deep enough in the chamber the brass will flow into them and cause them to stick. The primary extraction or cam is what gives you the mechanical advantage to pop them loose so the extract easily.

+1 here, see this all the time.