A client has asked me to go 4 thou deeper with his chamber on the go gauge, he was told by a very good source that its the way to. I have no reason to doubt his source but I cant see the reasoning for it. This affectively is going to be allowing the no go to go upon closure of the bolt. Its a 7-270wsm, Id like to see what you guys think of this and if you could share what you might think the logic is behind this.
Gunsmithing Deeper than no go
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Re: Deeper than no go
i have a 700p that is very long. will close on every gauge in the forster .308 match kit expect the no go gauge, and it shoots lights out. having said that, it's still your name going on that gun. if you don't feel comfortable doing something that you feel is unsafe, then you shouldn't do it.
i have a 700p that is very long. will close on every gauge in the forster .308 match kit expect the no go gauge, and it shoots lights out. having said that, it's still your name going on that gun. if you don't feel comfortable doing something that you feel is unsafe, then you shouldn't do it.
Re: Deeper than no go
There may be some issues.
These are some possibilities.
1. it may not extract loaded rounds that have not been fire formed in that chamber.
2. the brass may not work in any other rifle once it is fired. (not an issue in this case)
There may be some issues.
These are some possibilities.
1. it may not extract loaded rounds that have not been fire formed in that chamber.
2. the brass may not work in any other rifle once it is fired. (not an issue in this case)
Re: Deeper than no go
.004" over the go gauge with the barrel/receiver fit hand tight, will be closer to .002" over when it is torqued. .004" over the go gauge is probably close to the max headspace and i have no idea why he would want it set up that way.
.004" over the go gauge with the barrel/receiver fit hand tight, will be closer to .002" over when it is torqued. .004" over the go gauge is probably close to the max headspace and i have no idea why he would want it set up that way.
Re: Deeper than no go
Is it possible that your client wasn't clear when describing the project to this source?Specifically could he have explained it in such a way that the source just heard 7mmMag and not 7mmWSM?I ask as I have built a few rifles that it has been requested to cut the BELT recess deeper on standard magnums to cause it to headspace on the shoulder.It works great on the belted mags but what you are being requested to do makes no sense,ask for a reason.
Is it possible that your client wasn't clear when describing the project to this source?Specifically could he have explained it in such a way that the source just heard 7mmMag and not 7mmWSM?I ask as I have built a few rifles that it has been requested to cut the BELT recess deeper on standard magnums to cause it to headspace on the shoulder.It works great on the belted mags but what you are being requested to do makes no sense,ask for a reason.
Re: Deeper than no go
Does anyone here make it a habit to go back into the kitchen of a nice restaurant and tell the chef how to cook the meal?
I had a customer once tell me he wanted to have his barrel chambered with a reamer that was .01" undersize so that when the reamer ran out (because all chambers have .01" runout) it'd cut the chamber to size.
I think we can all hopefully see how silly that is.
Chamber dimensions exist for a reason. Cutting a chamber intentionally too deep opens the door for litigation later. If it were me I would chamber to the appropriate depth, then hand him the gun and the reamer. What he does from there is his choice and his risk.
If he wants .004" then a few twists by hand will get him there. .004" isn't much and chances are nothing bad will/would result from it. However the moment something does go wrong you can be certain you'll have him camped out on your door step. There are much easier ways to get a headache IMO.
I equate this to only putting on 3 of 6 lug nuts because someone told me it'd be better.
Does anyone here make it a habit to go back into the kitchen of a nice restaurant and tell the chef how to cook the meal?
I had a customer once tell me he wanted to have his barrel chambered with a reamer that was .01" undersize so that when the reamer ran out (because all chambers have .01" runout) it'd cut the chamber to size.
I think we can all hopefully see how silly that is.
Chamber dimensions exist for a reason. Cutting a chamber intentionally too deep opens the door for litigation later. If it were me I would chamber to the appropriate depth, then hand him the gun and the reamer. What he does from there is his choice and his risk.
If he wants .004" then a few twists by hand will get him there. .004" isn't much and chances are nothing bad will/would result from it. However the moment something does go wrong you can be certain you'll have him camped out on your door step. There are much easier ways to get a headache IMO.
I equate this to only putting on 3 of 6 lug nuts because someone told me it'd be better.
Re: Deeper than no go
I'd want a damn good explanation. It probably comes down to some shade tree gun plumbers bs about how his uncles, cousins, next door neighbors brother won a benchrest match in 1948 with a 219 Wasp chambered that way. OR he's an engineer. Their the worst at telling you how to do your job with no real clue.
If for some reason you do chamber it to his specs, stamp the specs on the barrel.
I'd want a damn good explanation. It probably comes down to some shade tree gun plumbers bs about how his uncles, cousins, next door neighbors brother won a benchrest match in 1948 with a 219 Wasp chambered that way. OR he's an engineer. Their the worst at telling you how to do your job with no real clue.
If for some reason you do chamber it to his specs, stamp the specs on the barrel.
Re: Deeper than no go
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mikki</div><div class="ubbcode-body">A client has asked me to go 4 thou deeper with his chamber on the go gauge, he was told by a very good source that its the way to. I have no reason to doubt his source but I cant see the reasoning for it. This affectively is going to be allowing the no go to go upon closure of the bolt. Its a 7-270wsm, Id like to see what you guys think of this and if you could share what you might think the logic is behind this. </div></div>
.004" over the go gauge is the no-go gauge and .004" over the no-go is a field gauge. For whatever reason, the guy wants the bolt to close on a no-go gauge. I wouldn't do it....Chamber it to SAAMI specs and if he really wants it, hand him his gun and tell him to buy his own reamer. Regardless of what happens, you're still the last "gunsmith" to touch the rifle, so tread carefully with this one....
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mikki</div><div class="ubbcode-body">A client has asked me to go 4 thou deeper with his chamber on the go gauge, he was told by a very good source that its the way to. I have no reason to doubt his source but I cant see the reasoning for it. This affectively is going to be allowing the no go to go upon closure of the bolt. Its a 7-270wsm, Id like to see what you guys think of this and if you could share what you might think the logic is behind this. </div></div>
.004" over the go gauge is the no-go gauge and .004" over the no-go is a field gauge. For whatever reason, the guy wants the bolt to close on a no-go gauge. I wouldn't do it....Chamber it to SAAMI specs and if he really wants it, hand him his gun and tell him to buy his own reamer. Regardless of what happens, you're still the last "gunsmith" to touch the rifle, so tread carefully with this one....
Re: Deeper than no go
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mikki</div><div class="ubbcode-body">A client has asked me to go 4 thou deeper with his chamber on the go gauge, he was told by a very good source that its the way to. </div></div>
His source is on crack. There's no way I'd go over the no go, I would'nt even chamber to a field gauge. Max I'd go is .001" over a go gauge when chambering. When you tighten the barrel you'll be dead on a go. There are steel gauges and SAAMI Specs for a reason.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mikki</div><div class="ubbcode-body">A client has asked me to go 4 thou deeper with his chamber on the go gauge, he was told by a very good source that its the way to. </div></div>
His source is on crack. There's no way I'd go over the no go, I would'nt even chamber to a field gauge. Max I'd go is .001" over a go gauge when chambering. When you tighten the barrel you'll be dead on a go. There are steel gauges and SAAMI Specs for a reason.
Re: Deeper than no go
Somebody refresh my memory. Which WSM case had to be RE-engineered because it would fit in some other WSM chamber?
It may be that this fella is trying to get the 7 WSM back to what it "should be" by using a 270 WSM reamer set a bit deep.
Dunno something just flashed in my grape between the 270 and 7mm WSM's that one had to have the shoulder set back and the neck elongated so it wouldn't fit somewhere else.
Food for thought.
Cheers,
Doc
Somebody refresh my memory. Which WSM case had to be RE-engineered because it would fit in some other WSM chamber?
It may be that this fella is trying to get the 7 WSM back to what it "should be" by using a 270 WSM reamer set a bit deep.
Dunno something just flashed in my grape between the 270 and 7mm WSM's that one had to have the shoulder set back and the neck elongated so it wouldn't fit somewhere else.
Food for thought.
Cheers,
Doc
Re: Deeper than no go
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mikki</div><div class="ubbcode-body">A client has asked me to go 4 thou deeper with his chamber on the go gauge, he was told by a very good source that its the way to. I have no reason to doubt his source but I cant see the reasoning for it. This affectively is going to be allowing the no go to go upon closure of the bolt. Its a 7-270wsm, Id like to see what you guys think of this and if you could share what you might think the logic is behind this.</div></div>
If you do this, at least try to cover your ass. Have him draw up and spec out the chamber dimensions he wants and have him sign off on it. I wouldn't even call it a 7-270wsm on the spec sheet, just not that the chamber is to be cut to clients custom dimensions. Sounds kinda fishy to me.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mikki</div><div class="ubbcode-body">A client has asked me to go 4 thou deeper with his chamber on the go gauge, he was told by a very good source that its the way to. I have no reason to doubt his source but I cant see the reasoning for it. This affectively is going to be allowing the no go to go upon closure of the bolt. Its a 7-270wsm, Id like to see what you guys think of this and if you could share what you might think the logic is behind this.</div></div>
If you do this, at least try to cover your ass. Have him draw up and spec out the chamber dimensions he wants and have him sign off on it. I wouldn't even call it a 7-270wsm on the spec sheet, just not that the chamber is to be cut to clients custom dimensions. Sounds kinda fishy to me.
Re: Deeper than no go
".004" over the go gauge is the no-go gauge and .004" over the no-go is a field gauge. For whatever reason, the guy wants the bolt to close on a field gauge."
what? you added extra .004's he asked for .004 over GO gauge...Still, he should just let you do your magic and he should stick to whatever he does. Tell him to quit reading benchrest central late at night..
I have chambered enough barrels to know that a perfect .0001 head space will most often be a PITA when it comes to bumping your shoulder back with a die (unless also custom) to make it fit back in the rifle. or you grind the shell holder so it will work. Every gun i build for myself is chambered to .003 over go before tightening. This gives me .0015-.002 over dead nuts -0- on the go gauge.
I have bran new lapua 6x47 brass that measures up to .010 difference from base to shoulder, so if i have a head space that is .0001 will it help???
".004" over the go gauge is the no-go gauge and .004" over the no-go is a field gauge. For whatever reason, the guy wants the bolt to close on a field gauge."
what? you added extra .004's he asked for .004 over GO gauge...Still, he should just let you do your magic and he should stick to whatever he does. Tell him to quit reading benchrest central late at night..
I have chambered enough barrels to know that a perfect .0001 head space will most often be a PITA when it comes to bumping your shoulder back with a die (unless also custom) to make it fit back in the rifle. or you grind the shell holder so it will work. Every gun i build for myself is chambered to .003 over go before tightening. This gives me .0015-.002 over dead nuts -0- on the go gauge.
I have bran new lapua 6x47 brass that measures up to .010 difference from base to shoulder, so if i have a head space that is .0001 will it help???
Re: Deeper than no go
FWIW +.004" over a go gage is still in specs. My guess is there's a brass issue he's trying to avoid. There are times when the radius on the reamer and the brass at the junction of the neck and shoulder do not match. There can be an interference fit with new brass until it's fire formed. I chamber 280 Ack Imp -.004" so factory loaded 280 ammo will fire. If I don't it violates rule #1 DON'T DO ANYTHING TO MAKE THE PHONE RING. Somebody will call and say they have a headspace problem when they don't. I'll bet the +.004" gives him a snug fit instead of a crush fit with new brass.
FWIW +.004" over a go gage is still in specs. My guess is there's a brass issue he's trying to avoid. There are times when the radius on the reamer and the brass at the junction of the neck and shoulder do not match. There can be an interference fit with new brass until it's fire formed. I chamber 280 Ack Imp -.004" so factory loaded 280 ammo will fire. If I don't it violates rule #1 DON'T DO ANYTHING TO MAKE THE PHONE RING. Somebody will call and say they have a headspace problem when they don't. I'll bet the +.004" gives him a snug fit instead of a crush fit with new brass.
