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Thread: Chances of GC coming off inside case?

  1. #1

    Chances of GC coming off inside case?

    I have often wondered what are the chances of a GC coming off inside the cartridge?

    I'm shooting a subsonic GC bullet unchecked in .270win. with good results. But I've also got a .300winmag that I thought about trying with cast but the WM case has a really short neck and a 180-200gr bullet would extend pretty far into the case.

    CS

  2. #2
    Boolit Buddy


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    I can't adress your calibers, but I shoot gas checked cast bullets in both of my Mosin Nagants and my 30-06 Springfield at full published data with no problems. I also shoot 30-30, 7.62X39 and 22-250 and have never had a gas check come off in a case. Never had any leading in any of my rifles.
    Hope this helps.

  3. #3
    Boolit Buddy MrHarmless's Avatar
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    I've never had an issue with gas checks coming off as they're pressed into the case, since the neck is only applying more pressure to the check on the way in.

    I have to seat the Lee 312-160-2R pretty deep to chamber reliably in a few calibers, and I've only had them come off when disassembling a round with a impact puller. The grip from the neck will pull them off.
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  4. #4
    Boolit Master Bazoo's Avatar
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    The old style Lyman checks and the simple homemade ones could come off if the base of the bullet was seated into the body of the case. But the Hornady crimp on checks will not. They crimp on, you can't get them off with any ease with pliers. Provided the gas check shank is sized correctly of course.

  5. #5
    Boolit Grand Master popper's Avatar
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    Don't think you need GC. I was shooting 185gr GC sans GC, just PCd ( not sub sonic) in BO the other day, accuracy was good at 50 yds. Yup, base way below the neck - but you do have a larger case body. Years ago a Canuk was shooting 06 IIRC with GC not crimped and had one stay in the barrel. IMHO came off in the case but blown into the barrel.
    Whatever!

  6. #6
    Boolit Buddy derek45's Avatar
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    years ago, i screwed up my powder measure and had to pull some 44 magnum bullets 430-310-RF with gas checks

    i used an inertia hammer and the roll crimp would grab the gas check and retain it in the brass
    .


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  7. #7
    Boolit Grand Master

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    I was always instructed that when shooting cast gas checked boolits in bottle neck cases to make sure to not seat the boolit so deep that the gas check was below the neck body juncture . The neck held the check in place and there was NO danger of the check falling off the base and lying on top of the powder .
    It made sense at the time so that is how I seat all my boolits (even the base of J-word's I don't seat so deep they encroach / hang down , into the case body) .
    That rule still makes sense ... so I still seat them that way .
    When you pull a loaded round , loaded with cast gas checked boolits , I have had the gas check stay in the neck but they are easily removed with needle nose pliers ...just don't shove the check down into the case body... you not getting that one out.

    If I were going to deep seat a gas checked boolit I would epoxy the check in place with a good two-part adhesive like J.B. Weld ...then I believe the check would stay put until fired ... they still may come off if you pull the boolit ... but as long as they are fired they should be OK !
    Gary
    Last edited by gwpercle; 07-31-2020 at 07:45 PM.
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  8. #8
    Boolit Grand Master

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    Quote Originally Posted by derek45 View Post
    years ago, i screwed up my powder measure and had to pull some 44 magnum bullets 430-310-RF with gas checks

    i used an inertia hammer and the roll crimp would grab the gas check and retain it in the brass
    Next time try seating the bullets just a little deeper to break the crimp, then pull them ...it might help! If not turn the GC sideways enough so you can grab it with small needle nose pliers ... sounds like I've done this ...yeah , several times .
    Gary
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  9. #9
    Quote Originally Posted by gwpercle View Post
    I was always instructed that when shooting cast gas checked boolits in bottle neck cases to make sure to not seat the boolit so deep that the gas check was below the neck body juncture . The neck held the check in place and there was NO danger of the check falling off the base and lying on top of the powder .
    It made sense at the time so that is how I seat all my boolits (even the base of J-word's I don't seat so deep they encroach / hang down , into the case body) .
    That rule still makes sense ... so I still seat them that way .
    When you pull a loaded round , loaded with cast gas checked boolits , I have had the gas check stay in the neck but they are easily removed with needle nose pliers ...just don't shove the check down into the case body... you not getting that one out.

    If I were going to deep seat a gas checked boolit I would epoxy the check in place with a good two-part adhesive like J.B. Weld ...then I believe the check would stay put until fired ... they still may come off if you pull the boolit ... but as long as they are fired they should be OK !
    Gary
    I don't think it's possible to load a bullet larger that 120gr in a .300 winmag without the base extending into the body of the case. It has a really short case neck. I had another thought after starting this thread. So, as posted above, I believe the crimped-on checks will stay in place so I don't think that will be a problem. However, with the short neck of the .300winmag, if load a 180-220gr bullet like it is made for not only will the check be below the neck but so will the lube grooves. I use SPG because I used to load BP cartridges and I still have a good supply of it. It works good with smokeless and cleans up easier than wax lube but, it has a really low melting point. Which means if I load a bunch ahead of time and they lay around very long, the lube will get in the powder. So, the only successful way I see to load cast in the winmag is with powder coated bullets, unless someone else has done it successfully.

    CS

  10. #10
    Boolit Master slim1836's Avatar
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    Quote Originally Posted by carolina sorillo View Post
    I don't think it's possible to load a bullet larger that 120gr in a .300 winmag without the base extending into the body of the case. It has a really short case neck. I had another thought after starting this thread. So, as posted above, I believe the crimped-on checks will stay in place so I don't think that will be a problem. However, with the short neck of the .300winmag, if load a 180-220gr bullet like it is made for not only will the check be below the neck but so will the lube grooves. I use SPG because I used to load BP cartridges and I still have a good supply of it. It works good with smokeless and cleans up easier than wax lube but, it has a really low melting point. Which means if I load a bunch ahead of time and they lay around very long, the lube will get in the powder. So, the only successful way I see to load cast in the winmag is with powder coated bullets, unless someone else has done it successfully.

    CS
    Don't get the false impression that by powder coating you will not need a gas check unless you plan on keeping it under a certain velocity.

    Slim
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  11. #11
    Boolit Master
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    I have shot a lot of gas checked cast and have never had a problem unless I tried to remove a bullet with a kinetic puller. I will never seat any bullet bellow the neck regardless of caliber,this is the main reason I do not own a 300WM but if it was built on a long action and had a long throat I would consider it. I believe with all the pressure behind a gas check it would be unlikely one would come off before the projectile left the barrel, but seat below the neck and all bets are off in my view. Regards Stephen

  12. #12
    Boolit Master
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    I have not had a problem shooting gas checked bullets in the 300 Savage, 308 or others when gas check is below neck. I have always used the crimp-on gas checks for these applications and sized after seating gas check. There are some who claim loss of accuracy, noticeable at 200 yards and beyond blamed on lead heating/melting above the gas check, I have not encountered this, with my 300 Savage giving 3 to 3.5 inch groups at 200 yards with a 311332 seated so gas check is below cas neck. Maybe larger charges of slower powders would do this, I am using 4227 or 5744. There are few bullets that DO NOT extend past the neck of the 300 Savage or 300 Win Mag. I shoot both and find accuracy can be excellent with either.

  13. #13
    Quote Originally Posted by Stephen Cohen View Post
    I believe with all the pressure behind a gas check it would be unlikely one would come off before the projectile left the barrel, but seat below the neck and all bets are off in my view. Regards Stephen
    That's kind of what I was thinking and then the powder and lube co-mingling isn't ideal either. I may just try to forget about cast in the 300WM. My load using Sierra's 165gr jhp shoots 1/2" @100yds and I don't think I can improve on that anyway.

    Thanks y'all,
    CS

  14. #14
    Boolit Buddy derek45's Avatar
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    Quote Originally Posted by gwpercle View Post
    Next time try seating the bullets just a little deeper to break the crimp, then pull them ...it might help! If not turn the GC sideways enough so you can grab it with small needle nose pliers ... sounds like I've done this ...yeah , several times .
    Gary
    That's exactly what I did LOL

    .
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  15. #15
    Boolit Master 44magLeo's Avatar
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    How about a drop of super glue in the check, hand seat the boolit in the check, then run through the luber? Seems like that would keep the check on.
    Leo

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check