My 6 Dasher has a .104 free bore and I want to shoot some 95 vld's through it. Took some measurements with the Hornady comparator and it looks like ill have 0.090 of bullet shank in the neck after I subtract 0.020 from my hard jam measurement. I loaded up 5 rounds at 1.780 which works out to 0.090 of shank left in the neck and it shot very well right off the bat with 32.6 grains of Varget. Question is what is considered the minimum amount of bullet shank in the neck? Seems like 0.090 is getting pretty minimal to me.
6 Dasher minimum bullet shank in neck
- Thread starter jaybray
- Start date
You shouldn’t worry and start jumping more than the "classic" 0.020
you’ll be fine
you’ll be fine
What is your chamber length? and what is your case length?If you have very short cases you may have created your own problem if that bothers you. I had shortened the chamber length with the 1,555 Blue box brass and fire formed at 1.550 and ran Freebores from .135-.150 and had no issues.... If you let the case length get short fire forming like 1.530's you created your own problem.... jim
LA50SHOOTER
Sworn To Protect The Constitution.
I've shot a mere 0.060 of bullet shank in the neck with a 200-20x (200 gr. Berger) in a longer throated 300 WSM (0.270 throat) and was very suprised when it shot 0.089 at 100 yds (5 shot group).
- As was stated, care in handling loaded cartridges and not having short cases are factors to pay close attention to.
- As was stated, care in handling loaded cartridges and not having short cases are factors to pay close attention to.
Well my fired cases measure 1.536. I used hydro formed brass and kept tweaking the full length die until I could just barely close the bolt on the un fired case then used 32 grains of varget to fire form. I am not sure what the chamber length measures. If it matters I am using the old gold box lapua brass. I have a good coyote load with the 87 vmax and don't have to shoot the 95 vld but the groups I fired at 200 yards really make me want to shoot the 95 vld.
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Gold box brass is even longer we used the 1.570 chamber length with it. You are really making some short cases. You need to do a search and learn how to fire form cases and park that hydro forming stuff. I have no idea how long your chamber is but you need .024 to .034 less free bore to make up for your short cases.. jim
You need to read how to make FF. brass the right way or start shooting longer bullets. If you are loading correctly and sizing them right they should never grow much, The cases will never grow to the right length in your lifetime...... your other recourse is to set the barrel back a turn and throat it about .070 free bore length.... jim
Yes the 87 vmax and the berger 105's are no problem with these shorter necks. The 95 will work but i guess not optimal as far as case neck is concerned.
There is your answer. Doesn't matter what anyone says. If it works in your rifle, its correct.
RegionRat
Gold $$ Contributor
If it works for you, and you are not kidding yourself about safety and reliability, then that is what is at least the right answer for you.
Single feed bolt guns without the worry of extraction from jam are one thing, semi-auto with two-way range responsibility is another, and mil-spec machine gun ammo is yet another.
The standard for those two scenarios is vastly different because the forces on the cartridges are vastly different and the consequence of the bullet moving accidentally are different.
A few things to ponder are an understanding of the criteria for the context.
Will magazine feed bend or damage the round?
Will chambering forces case the bullet to slide forward or set back?
Are the bullets normally jammed into the lands and can they then be extracted without damage?
Etc. etc.
Rules of thumb are okay for beginners to stay out of trouble, so using concepts like one diameter of bearing area as a minimum depth, or 40 lbs of force without set back, etc., are a starting point, but only go so far.
Anything that survives the trip from the bench to the chamber in a single feed bolt gun in a target range setting, would be a minimum. The problems start when we take that criteria an apply it to the wrong context.
Single feed bolt guns without the worry of extraction from jam are one thing, semi-auto with two-way range responsibility is another, and mil-spec machine gun ammo is yet another.
The standard for those two scenarios is vastly different because the forces on the cartridges are vastly different and the consequence of the bullet moving accidentally are different.
A few things to ponder are an understanding of the criteria for the context.
Will magazine feed bend or damage the round?
Will chambering forces case the bullet to slide forward or set back?
Are the bullets normally jammed into the lands and can they then be extracted without damage?
Etc. etc.
Rules of thumb are okay for beginners to stay out of trouble, so using concepts like one diameter of bearing area as a minimum depth, or 40 lbs of force without set back, etc., are a starting point, but only go so far.
Anything that survives the trip from the bench to the chamber in a single feed bolt gun in a target range setting, would be a minimum. The problems start when we take that criteria an apply it to the wrong context.
Got out yesterday and to finish off load development for my 6 Dasher and the 95 Berger hunting vld. Not a whole lot of bullet shank in the neck but enough by the looks of it. Load is 34.2 Varget and 1.772 oal length to ogive and shot at 320 yards. Rifle is a Sako varmint laminate factory action re barreled to 6 dasher from 22 250. I tried 32.6 at 320 yards but it was a no go. Worked up to 34.2 and i will call it good. Only 3 shots but it's only a coyote rifle. Target was drawn with a frozen felt pen in -20 C weather so ya a little ugly looking.
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I will take that any day good job.
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