Long bullets and short necks

[mdevlin53]

I have read several times that one should not seat a gas checked boolit past the neck on cases like .308, 30-06 and 7.7 jap. Now i have several different boolit weights for these cartridges and i would like to know how this is done without exposing the grease grooves. even the lightest at 150 grs leaves one groove exposed. could someone please explain what is the best practice, I just read a post where someone had a large pointed cast bullet and it was seated well into the case but in other posts they warn to never do it.
I am set to load about 20 .308 and will probably try it both ways and shoot them to see if i can notice a difference.

[Dutchman]

Bare naked grease grooves is where it's at, bro... Take a walk on the wild side..

http://images61.fotki.com/v52/photos/2/28344/1676633/DSCF2107cb-vi.jpg

http://images45.fotki.com/v1427/photos/2/28344/157842/yr23-vi.jpg

[shotman]

If you can put a bullet that long in a chamber then you dont need to worry about anything
for the smart people keep the check near the top of the neck

[mdevlin53]

I guess the two questions that come to mind when seating that far out is 1, isn't there a chance that the bullet witll just pop off if you give it a wrong nudge? and 2. what about recoil dislodging a bullet in the magazine? they look a bit on the fragile side,

[1Shirt]

I prefer to not seat the blt below the base of the neck, but have on occaision with some blts, in rifles with short throats. Think the issue is the fact that the check might come off in the powder chamber and could produce who knows what results, possibly some danger. Where I have seated below the neck on rifle cases, I have always used dac fill on the theory that the check would be held in place. May or may not be a valid theory.
1Shirt!

[paul h]

The times I've used a bullet with the gas check seated below the neck, my accuracy has been horrible. I don't know the mechanism of the poor accuracy, but based on my exerience I've avoided it at all costs.

[MT Chambers]

In alot of chambers/barrels, bore rider designs can be used and seated well out, so that the GC is in the right place. The only problem is magazine length, which doesn't bother me much as most of my rifles are single shots.

[mdevlin53]

I usually mak up some dummy cartridges so i can check the OAL I shoot the .308 in a SS and the 30-30 in a lever and a SS and the 30-06 is an old Mauser so i will be able to load the singles out far enough to keep the check in the neck. But for the 30-30 lever gun even the 150 gn will have the check past the neck if i keep it short enough to cycle. I well be going to the range friday and i will shoot some and see how the accuracy is with what i havee loaded now and then go back and adjust as needed.

[runfiverun]

when i have a boolit go below the case neck i will seat it long and let the closing of the action fully seat the boolit.
i generally get better accuracy that way.

you can clean out any exposed lube grooves of lead also you really only need one maybe two full.

[popper]

30-30 lever gun even the 150 gn will have the check past the neck if i keep it short enough to cycle This shouldn't happen with a 30-30 designed CB, even 170 gr. If lead is exposed in the case, the use of the GC is negated. Accuracy won't be very good.

[mdevlin53]

I shot my .308 today and the gun really likes the boolits seated long. the rounds with the gas checks seated deeply sprayed all over the place and some even looked like they were tumbling, the rounds seated long enough to keep the check in the neck were shooting into a 2 inch group. i am going to have to recheck the OAL on the ones i loaded for the 30-30 to see how far out i can seat them,

[Blammer]

way past the neck
http://i54.photobucket.com/albums/g81/blammer8mm/Cast%20boolits/DSCN6281crop.jpg
target for it
http://i54.photobucket.com/albums/g81/blammer8mm/Targets/File0150.jpg

way past the neck
http://i54.photobucket.com/albums/g81/blammer8mm/Cast%20boolits/DSCN7523.jpg
http://i54.photobucket.com/albums/g81/blammer8mm/Cast%20boolits%20fun/DSCN7989.jpg
100yd target for the 8mm loverin
http://i54.photobucket.com/albums/g81/blammer8mm/Targets/DSCN8418.jpg

yea, make sure you keep that GC in the neck.....:kidding:

you may also want to talk to all those shooting the 311247gr NOE whisper boolit, see if they keep it in the neck.

personally, I go for accuracy and don't worry where the boolit needs to be seated, I let the rifle tell me that.

[geargnasher]

.......Personally, I go for accuracy and don't worry where the boolit needs to be seated, I let the rifle tell me that.

Works so much better than following all the internet myths, doesn't it? :bigsmyl2:

Gear

[Larry Gibson]

Some get acceptable accuracy seating the GC below the case neck. Most of us who strive for best accuracy try to keep the GC inside the case neck, especially if the GCs aren't crimp ons. It also has been shown that with some alloys, bullt designs and loads the the exposed portion of the bullet can get gas cut and severely deformed. Others seat the bullets out into longer throats so the front driving band is just off the lands. All these have been mentioned and contribte to best accuracy. I don't mind lube grooves showing for range, target and plinking loads. Hoever for hunting loads I try to select appropriate bullet designs that allow all the lube grooves to remain in the cases neck with the GC, at least the top of the GC should remain in the case neck.

Whether you prefer the lube "in" or "out" depends on what you define as acceptable accuracy for for a given bullet in a particular case and are willing to accept.

Larry Gibson

[1Shirt]

Pretty well stated Larry!
1Shirt!

[popper]

blammer - #12 - most of what is in the case is GC. Try one that gets lead into the case and has the nose near the lands. Not faulting your results at all, just don't like making blanket statements. IMHO, if much lead in in the case, the effectiveness if the GC is reduced. I loaded 30-30 CBs in 308 cases, seated deep to solve feeding problems and accuracy was really poor. I got a 308 mould so I'll compare as to where the base is seated.

[HORNET]

A little dacron fiberfill to keep the powder out of the lube, keep the gas check in place, and reduce boolit base damage doesn't hurt either...