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Finding the right seating depth

dedogs said:
Wow! I would never pull that barrel out unless there was money on the table! :) :)
That's the purpose of this thread. Without a procedure to find the correct seating depth. How many barrels have great potential but the, in this case .005 or .008 off or some other seating depth pulled from thin air is all that is used. Then a guy just constantly messing with powder weight and the full potential of the barrel is never realized
Seating depth is the key
 
brians356 said:
28.5-gr @ -.011 doesn't show enough vertical spread to be useful in the wind.

We dont tune for vertical as it makes the groups too big. We tune for zeroes. We use sighter targets and wind flags combined with seven minutes to shoot so we're not handicapped into shooting big groups in our game
 
Tim Singleton said:
martin22250 said:
Tim are you using lt 32?
Yeah, it's LT32 the top of the pic got cut off where I've got it written.
Sorry about that.

I've gave up on LT 32 and went back to n133. N133 sure don't meter as well and seems really temp sensative but I seem to shoot better with it. Hope to see you at a match one day
Dustin
 
Tim, Thank you again for having the patience to stick with this thread, it has been very informative and helpful. From one of those "pigs looking at a watch". :D :D dedogs
 
Tim Singleton said:
New barrel with seating depth testing from yesterday. This is a pretty good shooter.
I'm gonna screw it off and save for the Shamrock. Further demonstrates the importance of seating depth

Tim,

Great thread I'm glad that you took it on! The only improvement I can see is when you post pictures of those tiny groups you've been shooting write the "BARTS" on the target much Bigger! ::)
 
BartsBullets said:
Tim Singleton said:
New barrel with seating depth testing from yesterday. This is a pretty good shooter.
I'm gonna screw it off and save for the Shamrock. Further demonstrates the importance of seating depth

Tim,

Great thread I'm glad that you took it on! The only improvement I can see is when you post pictures of those tiny groups you've been shooting write the "BARTS" on the target much Bigger! ::)

You are right my friend. That is a big part maybe the biggest. Idk.
I've tried a lot of others and can't get to the dot with them.
I love those BARTs 68bt
 
Tim Singleton said:
Seating depth test with new Hawk Hill Barrel

So -.015 at 28 and 28.5. Would you load 28 or 28.5 or would you try something in between, say 28.2 or 28.3?
 
Dos XX said:
Tim Singleton said:
Seating depth test with new Hawk Hill Barrel

So -.015 at 28 and 28.5. Would you load 28 or 28.5 or would you try something in between, say 28.2 or 28.3?
I ran out of time and target today. With this barrel I'll probably do as Dusty suggests keep coming on off the lands hoping for something a little better than .015 off.
But to answer the question if I had to take this one to a match and .015 off was the best it had I would go to the line with 3 different loads that particular morning. 28, 28.3, 28.6
Test each of these on the sighter in the warm up period. Then go to the record with the best load at that time.
The load will change day in day out and throughout the day. What I'm trying to do is determine the best seating depth across as wide of a powder change that that particular barrel has to offer
 
Dusty Stevens said:
Keep goin. You may find my magic seating depth at .026 or so. May need a powder bump tho
It was settling down in the bags and feeling better at .015 off so hopefully it wil knot up a little further out.
The Bartliens I have usually hit between .008 off and .012 off with Barts 68bt.
This one isn't but maybe it will a little further out
 
Excellent thread and some pretty impressive groups. I have been digging into the concept and so far what you have shown is what I have expected but wasn't quite sure. My thoughts were that once found the seating depth is the constant ant the powder charge would be the adjuster to stay in tune until the throat wears. At that point do you just move the seating depth the amount the throat moved?
 
kolar55 said:
Excellent thread and some pretty impressive groups. I have been digging into the concept and so far what you have shown is what I have expected but wasn't quite sure. My thoughts were that once found the seating depth is the constant ant the powder charge would be the adjuster to stay in tune until the throat wears. At that point do you just move the seating depth the amount the throat moved?
That is how I see it. Others may have different opinions or experience I'm sure.
But so far this method is working pretty well for me. Again it is not something I arrived at myself. I learned this method from Tony Boyers book and first hand from some other very successful BR shooters
 
kolar55 said:
Excellent thread and some pretty impressive groups. I have been digging into the concept and so far what you have shown is what I have expected but wasn't quite sure. My thoughts were that once found the seating depth is the constant ant the powder charge would be the adjuster to stay in tune until the throat wears. At that point do you just move the seating depth the amount the throat moved?

We check our jam pretty often and adjust from there. Just a secret that ill let out- the throat doesnt move. As a barrel is fired the pressure expands it and it doesnt come back to the same spot but almost. So with more pressure the freebore diam gets bigger faster and you have to seat out more to reach it. Just a little tidbit to chew on that most that know wont ever tell. We're talkin expansion of like .000000005 then it comes back .000000004 after the shot. These numbers are of course fictional because nobody can measure it every shot but could calculate it over 1000 shots.
 
Tim Singleton said:
Completely out of tune on the left. Very wind sensitive
Slight seating depth and load change in tune on right. Same bullet and half vertical
Same match. Virtually same conditions

Tim, was it only seating depth you changed for this result, or was there some powder tweaking as well.?
 

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