Load coming out of tune?

[6BRA]

I took three fired cases that have had their shoulder bumped, barely seat the bullet into them and then chamber them and quickly open the bolt

what ejector? Firing pin removed? Wheeler method will give you exact touch point. If TG ejector you wont need to mess with. Firing pin must be removed. The free bolt drop will tell you. Still not sure of your bolt configuration.
edit
a hornady/stoney point will not give you exact. If you want to mark you touch point for repeatable and future reference for throat erosion. Unless you pull the bbl, there is really no other way to do this. This method measures to the thousandth. jmo. My Bra with 700 hot rounds has .007 erosion. It must be known.
Mike

 

[Ajwilly96]

what ejector? Firing pin removed? Wheeler method will give you exact touch point. If TG ejector you wont need to mess with. Firing pin must be removed. The free bolt drop will tell you. Still not sure of your bolt configuration.
edit
a hornady/stoney point will not give you exact. If you want to mark you touch point for repeatable and future reference for throat erosion. Unless you pull the bbl, there is really no other way to do this. This method measures to the thousandth. jmo. My Bra with 700 hot rounds has .007 erosion. It must be known.
Mike

It’s a TG ejector, firing pin was not removed

 

[6BRA]

It’s a TG ejector, firing pin was not removed

Remove the firing pin assembly and you are on your way to accurate precise readings. This was a Panda correct? Make sure that your brass is de-primed. You don't want a proud primer crater. Proceed with wheeler drop bolt method. Progressively seating the bullet in .001 increments as the bolt starts to drop. As it gets to about the 1 or 2 o clock position slow down on progressive seating and only go .001 at a time. when the bolt drops free. You have gone .001 past touch. Measure every bullet you plan on using in that chamber and be done with it. You now have a solid reference of exact touch for every bullet. The TG makes life easy . Get the Kleinendorst tool or whatever its called from Brunos.

 

[Owens85]

Remove the firing pin assembly and you are on your way to accurate precise readings. This was a Panda correct? Make sure that your brass is de-primed. You don't want a proud primer crater. Proceed with wheeler drop bolt method. Progressively seating the bullet in .001 increments as the bolt starts to drop. As it gets to about the 1 or 2 o clock position slow down on progressive seating and only go .001 at a time. when the bolt drops free. You have gone .001 past touch. Measure every bullet you plan on using in that chamber and be done with it. You now have a solid reference of exact touch for every bullet. The TG makes life easy . Get the Kleinendorst tool or whatever its called from Brunos.

This . And also make sure your chamber is clean and brass is bumped enough so bolt drops freely before starting.

 

[gpoldblue]

This . And also make sure your chamber is clean and brass is bumped enough so bolt drops freely before starting.

Should also be a fireformed(properly) case.

 

[Bill Norris]

I’ll be the minority having no problem using a Hornday L&L tool and comparator, lightly push the bullet into a clean chamber until it stops. That’s zero, beyond that is inside the lands.

Yea, me too. After all it's only a comparative number. Testing finds the definite place of rest of seating depth.

 

[Fairchaser]

Tell a guitar player that once his instrument is tuned it should stay that way forever cause nothing changes.

Every time you load, something is changing. The brass changes every reload. The barrel erodes a little and the environmentals are always different. That assumes you can load exactly the same with the same powder lot and same bullet lots, etc. etc.

Thus, the tune of your rifle with the changing ammo must be adjusted to maintain the maximum precision. If you can develop a load with a wide tune window, then fine tuning is less needed. This is the goal.

I use the tuner to keep the fine tune on my rifle. I expect it to change and it does. Like a good musician, I’ve learned to keep my rifle in tune. It is a feel thing when I start shooting if the rifle goes where I expect it to, it’s in tune. I keep adjusting until it does.

 

[Kracken McGraw]

Tell a guitar player that once his instrument is tuned it should stay that way forever cause nothing changes.

I don’t know why, but that statement makes me think of a lot of small square hay balers I have ran in my past. lol.

 

[William Vogel]

So my new COAL measurement is 2.7370 to touch. The person I was comparing with was sitting at 2.701.

Either this is a fast wearing barrel, or thoroclean is causing some wear.

Did you “lap” the barrel immediately after chambering it and assembling it to the receiver or did you get the gun assembled, measure for the lands and go shoot? New chambers grow from breakin and 223 doesn’t wear quickly. It will grow 0.010- 0.015 as the leade and throat get smoothed out from firing.

 

[Cfshooter]

not sure if it was mentioned, but some days we don't shoot as well as other days, and when we are talking .25", that does not take much.

 

[Murray Brook]

not sure if it was mentioned, but some days we don't shoot as well as other days, and when we are talking .25", that does not take much.

Certainly true. I always compare shooting to pool playing. Some days you can't run 3 balls and other days they can't get you off the table. Nothing changed with the balls/table/queue.

 

[Cfshooter]

Certainly true. I always compare shooting to pool playing. Some days you can't run 3 balls and other days they can't get you off the table. Nothing changed with the balls/table/queue.

So true lol.

 

[Straightshooter1]

Certainly true. I always compare shooting to pool playing. Some days you can't run 3 balls and other days they can't get you off the table. Nothing changed with the balls/table/queue.

Yup. The same kind of things goes for two other sports I'm involved with . . . Golf and Baseball.