Skip to main content
Help Center Community Shop

Best Grain bullet for .223 in 1:10

bnocenti
Not sure this is the right place to ask this question but I was wondering if we have any expert reloaders on the forums.

I'm looking to get into reloading but I'm wondering what the best grain round would be in a .223 for a 1 in 10 twist. I'm thinking of purchasing a Sig 550-1 and would like to know what the best round to put through it would be. Not knowing much about bullet design I was looking into some boat tail rounds but I'm not sure if this is suggested for such a small round.
0

Comments

9 comments

Date Votes
  • Juggernaut
    Not a 1:10, however in a 1:9 I like the Prvi Partizan 69gr Match HPBT and it performs fine and have heard the same from some others with a 1:10 as well although ymmv.

    Regards

    Edit:

    I would agree Armilite, length and the weight definitely effect performance and the BT is more stable than the non-BT especially once transonic speeds are reached. This could explain why some reported good results with the Prvi Partizan 69gr Match HPBT out of the 1:10 which I believe were the 20" Hbar but as stated ymmv.

    Regards
    0
  • armilite
    It would probably be best to stick with 55-62 gr. bullets. The 1-10 twist rate now days is a slow rate. But since you reloading it doesn't hurt to experiment but you'd probably run into problems with the heavier longer bullets. I had a Thompson Contender with a 1-12 twist rate.
    Using the old Speer 70 grain bullets that weren't really that long caused the bullet to go through paper sideways. The 1-12 couldn't stabilize the 70 grainers.


    EDIT Boat tail bullets are not the culprit in themselves it would be the length and weight that come into play. A 55 grain boat tail would be fine. Boat tail bullets are generally more accurate then non boat tails.
    0
  • 5mmgunguy
    I would use 55 gr and 62 grain for the heavy size.
    0
  • Mobuck
    My .223 rifles with slower twist rates prefer the 45-50 grain bullets.
    0
  • bigoutside
    I don't think you'll really know until you start trying. I have a 1:10 that love 69 gr boat tail match king. And anything under 55 gr. don't have a clue why.
    0
  • tsr1965
    The 1 in 10, should be good for anything from 40 grains to 62, and possibly 69 grains, depending on the actual bullet length. Most commercial 223 rifles, are 1 in 12, if I am not mistaken, and will handle anything up to 60 flat base hollowpoint ok.

    Best
    0
  • bnocenti
    Thank you for all the information guys. The barrel length is 25.6 in. but I'm not sure how much that would affect the bullet weights as I'm not an expert when it comes to barrel length to bullet weight expert.
    0
  • dcs shooters
    quote:Originally posted by bnocenti
    Thank you for all the information guys. The barrel length is 25.6 in. but I'm not sure how much that would affect the bullet weights as I'm not an expert when it comes to barrel length to bullet weight expert.


    The barrel length has nothing to do with it. It's the length of the bullet that should match the twist rate. The military wanted to go to a heavy bullet, which is longer, so went from a 1/12 to the 1/7 twist. That wasn't the best so they settled on the 1/9 twist.
    0
  • beantownshootah
    quote:Originally posted by bnocenti
    Not sure this is the right place to ask this question but I was wondering if we have any expert reloaders on the forums.

    I'm looking to get into reloading but I'm wondering what the best grain round would be in a .223 for a 1 in 10 twist. I'm thinking of purchasing a Sig 550-1 and would like to know what the best round to put through it would be. Not knowing much about bullet design I was looking into some boat tail rounds but I'm not sure if this is suggested for such a small round.


    Good info already given.

    My question is "best for what purpose"?

    A 1:10 will handle all the 55 and 62 grain military type ammo you care to use for practice/defense. It will also handle any number of hunting rounds of around that weight.

    "Boat tailed" rounds should work fine in ANY barrel with virtually ANY bullet weight.

    In short, the tapered bullet rear end makes these rounds more aerodynamic, so they retain velocity better at distance. That's typically an advantage (especially for accurate long distance shooting), but there might be certain specific circumstances where its not.
    0

Please sign in to leave a comment.

Recent Activity

Didn’t find what you’re looking for?