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Thread: Total length

  1. #1

    Total length

    I'm new to reloading, was wondering how do you work out the lenth you seat the bullet at as there seems to be a few tho difference in bullet head lenths, I measured some v max, and they seem to all be slightly different lengths, also I read some where that the ideal total length is 20 tho off the lands, is that correct, if so how do I do that, many thanks, cheers

  2. #2
    This may help and 20 tho is a good start you will have to see what works best for the gun

  3. #3
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  4. #4
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    I do it by seeing, first, if the maker's manual recommends an OAL....or if the bullet has a crimp groove then seating the bullet to that. That is usually the simplest way. Seating to the crimp groove.

    Or a powder manufacturer's manual recommends an OAL. If not then load to what you think is OK a bullet into an empty sized case and keep adjusting the OAL until it chambers. See if any rifling marks on the bullet and if so seat it down into the case by 20 thou or more.

  5. #5
    Quote Originally Posted by Bramble View Post
    I'm new to reloading, was wondering how do you work out the lenth you seat the bullet at......
    If new to reloading just stick to the SAAMI COL, provided it will cycle from your rifles magazine, and work up an acceptably accurate load. IMHO seating bullets X thou off the lands might, (just might mind you), improve accuracy, but get your best load sorted before being too concerned about bullet seating depth.

    It's minute of deer rather than bench rest accuracy you're looking for isn't it?

  6. #6
    Quote Originally Posted by Bramble View Post
    I'm new to reloading, was wondering how do you work out the lenth you seat the bullet at as there seems to be a few tho difference in bullet head lenths, I measured some v max, and they seem to all be slightly different lengths, also I read some where that the ideal total length is 20 tho off the lands, is that correct, if so how do I do that, many thanks, cheers
    Seat to recommended OAL as measured from the tip of the bullet. This is how the load data was developed, it is how the data is presented, and it's how factory loads ammunition. You can hardly go wrong. BEware of "crimping grooves" in some bullets, they aren't. Seat to OAL without regard to them.

    As to the 'ideal' distance to the lands being .020 inches. Nonsense. It may, but then it may not. The best factory match ammunition is not seated to "X" thou off of anyones lands. It is seated to SAAMI/CIP recommended OAL for that cartridge. Think about this.~Muir

  7. #7
    Quote Originally Posted by in2stella View Post
    This may help and 20 tho is a good start you will have to see what works best for the gun
    Very helpful, thanks for posting.

  8. #8
    Comedy central, pliers on nads there.

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  9. #9
    the 20 thou is just somewhere to start from, don't seat it any closer than that or you'll see some serious pressure issues. I was developing a new load for my 22/250 with Amax and loaded four lots of three different test rounds all with same powder bullet etc. One lot of three I seated the bullets much deeper than I normally would, around .7mm deeper. Surprisingly this was by far the most accurate with it being difficult to determine the individual bullet holes at 100m.
    So like everything with reloading, get out and experiment, everyones rifle will shoot slightly differently.

  10. #10
    Quote Originally Posted by llwynog View Post
    the 20 thou is just somewhere to start from, don't seat it any closer than that or you'll see some serious pressure issues. I was developing a new load for my 22/250 with Amax and loaded four lots of three different test rounds all with same powder bullet etc. One lot of three I seated the bullets much deeper than I normally would, around .7mm deeper. Surprisingly this was by far the most accurate with it being difficult to determine the individual bullet holes at 100m.
    So like everything with reloading, get out and experiment, everyones rifle will shoot slightly differently.
    how do you figure this?
    lengthening a load while keeping the charge constant drops pressure and velocity. unless you jam it into the lands there are unlikely to be pressure issues.

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