6 dasher norma brass

[hicap40]

finally got the bolt easily to close after trimming to 1.564
how much more should i trim off of that? .005, .010?

Bought A 6 dasher from Lonnie Anderson a couple of years ago and I am just getting around to shooting it.



Thanks In advance
John Hiller

 

[timeout]

I have read on this forum an opinion that less clearance helps in the prevention of a carbon ring. I cannot verify this personally. It seems to me that with very minimal clearance a person would want to stay on top of his cleaning regimine to make certain there wasn't a carbon ring forming. I use a brush and Iosso for this purpose. Hopefully someone will chime in with a proven recommendation.

 

[oldduc]

finally got the bolt easily to close after trimming to 1.564
how much more should i trim off of that? .005, .010?

Do you have a way to measure your actual chamber length? If you can establish this, the recommendation I have seen is 0.015 clearance.
There was an article in the March 11, 2018 Daily Bullitin on how to measure your chamber. http://bulletin.accurateshooter.com/2018/03/how-to-craft-your-own-chamber-length-gauge/ Or you can buy a Sinclair gage.
Gary

 

[oldduc]

Do you have a way to measure your actual chamber length? If you can establish this, the recommendation I have seen is 0.015 clearance.
There was an article in the March 11, 2018 Daily Bullitin on how to measure your chamber. http://bulletin.accurateshooter.com/2018/03/how-to-craft-your-own-chamber-length-gauge/ Or you can buy a Sinclair gage.
Gary

Edit: I didn't mention that I measured my chamber at 1.584 and trimmed the Norma brass to 1.570. I only trimmed 25 pieces so I can see what it does after being fired. Sometimes the neck will get shorter and sometimes it will get longer. Depends on how much the body expands.

 

[hicap40]

thanks

 

[hicap40]

seems like .010-.015 is the way to go, i will end up buying the sinclair chamber length gause just to get a more accurate measurement.

http://6mmbr.websitetoolbox.com/post/trim-to-chamber-length-3152402

 

[LRPV]

seems like .010-.015 is the way to go, i will end up buying the sinclair chamber length gause just to get a more accurate measurement.

http://6mmbr.websitetoolbox.com/post/trim-to-chamber-length-3152402

Be careful with that “tool”. The front of your chamber is beveled and depending on your neck diameter in relation to the OD of that plug, your measurement can end up a fair bit longer than what you think you’re measuring.

 

[oldduc]

Be careful with that “tool”. The front of your chamber is beveled and depending on your neck diameter in relation to the OD of that plug, your measurement can end up a fair bit longer than what you think you’re measuring.

The shouldn't be beveled much. All the reamers I've seen cut them pretty square. They get pretty beat up after a while though: