Privacy guaranteed - Your email is not shared with anyone.

Welcome to Glock Forum at

Why should YOU join our forums?

  • Reason #1
  • Reason #2
  • Reason #3

Site Description

Best bullet weight for 308

Discussion in 'General Firearms Forum' started by zhix, Feb 17, 2012.

  1. zhix


    Jan 31, 2010
    In a bolt action 308win, which would be better- 168 grain or 175?
    The barrel will be 24 inches with a 1:10 twist, distance will be mostly under 250 meters.
    I am looking specifically at Federal Gold Metal Match BTHP loaded with Sierra Matchking bullets.
  2. I believe that describes my Savage 10FP. I shoot those 168gr and get .75" 5-shot groups at 100 yards.

    I haven't tried the 175gr.

    Most of the limitations would be me, not the gun. Although with 150gr basic hunting loads from Win and Rem, the groups are about 1.5", so it does seem to like the Fed GMM.

  3. bac1023


    Sep 26, 2004
  4. cysoto

    cysoto Gone Shooting!

    Jan 21, 2004
    Denver, CO
    You can shoot almost any weight bullet you like and they will all perform very similarly at the distances you are going to be shooting. The 175gr & 178gr bullets really start to shine at anything over 600 yards.

    I shoot my 155gr SMK Palma bullets at 1,200 yards with really good results on a calm day out of a 1:12 barrel. When the wind starts to blow hard or I want to reach out to 1,600yds, I switch to a 1:10 barrel and 178gr Hornady Match bullets.
  5. D3S3RT_P3NGU1N


    Feb 29, 2008
    In my experience 1:10 twist .308 rifles tend to favor the 175gr SMK and the 155gr Scenars. I'm not a huge fan of the 168gr SMK, mainly due to its performance when you push out past 800 yards or so. The 168gr Amax is better but I still prefer the 175gr SMK and 155gr Scenars. Inside 250 though the 168gr SMK will still do just fine

    Palmetto has some good prices on FGMM right now

    Southwest ammo is also a fantastic choice and they have loads using the 155gr Scenars, 168gr SMK, 168gr Amax and 175gr SMK available.

    What rifle will you be shooting anyway?

    The best option is really to buy a some of each and see what performs in your particular rifle
  6. PrecisionRifleman


    Jan 24, 2011
    168gr works best in 1:12 twist, and 175-178 works really well in 1:10 twist.

    BTW I load 168SMKS's and they are pretty darn accurate @ 500 yards in my LTR, but I found out last summer that the 168 Amax is even more accurate. With the 168Amax I can consistently hit softballs and spray paint cans @ the 500 with incredible consistency. I haven't tried doing the same with the SMK's, but from what I have seen them do on steel, I know they aren't as accurate in my rifle as the 168 Amax's. My 20" barrel LTR has a 1:12 twist. I haven't been able to get the 175-178gr's to shoot near as accurate as the 168s. So if I want to do some really long range work (past 700-800 yards) my go to rifle is my Sako TRG42 in 300WM.

    With a 24" barrel using 175-178's you should do pretty well out to 1k with some good practice. I just can't push the 175-178's as accurately & as fast as I'd like in my short barrel with the 1:12 twist to really get the benefit of using them at longer ranges. I still have some experimenting to do, and I'm sure I will find a recipe that will do ok, but since I have the TRG I'm mostly going to leave the really long range stuff to that.

    Let's us know what works for you, and don't be afraid to try out some BVAC (Bitter Root Valley) Amax's if your going to shoot mostly factory. They are about half the price of a box of FGM SMK's and in my experience are more accurate
    Last edited: Feb 18, 2012
  7. zhix


    Jan 31, 2010
    Thanks for the replies,

    The rifle will be a Savage 10 FCP-SR.

    I have used PSA before and looks like they've got a good if not the best deal on the Federal GM.

    I was curious about what distance you need to start using a heavier bullet, but my regular range is just over 250 yds so that's what I'm limited to for now.
  8. Cool info guys, now I'll keep my eye out for some 180gr hunting loads to see how they do.
  9. Jim Watson

    Jim Watson

    Jul 10, 2001
    While the 175 has a better ballistic coefficient, at 250 metres, that is largely a theoretical advantage. The only way to know which bullet is more accurate in your rifle is to get some of each and shoot them in your rifle.

    Trivia: In olden times, the 168 gr SMK was the "Sierra International" because it was optimized for ISU shooting at 300 metres. But 600 yards for NRA Highpower was a bit of a stretch, which is why they brought out the 175 to give the BC of the old 173 gr fmj military match and the precision of a hollowpoint.
  10. ArtCrafter

    ArtCrafter ¤Hocker Mocker¤

    Jul 14, 2008
    Probably the one that shoots best in your rifle.
  11. NEOH212

    NEOH212 Diesel Girl

    Mar 25, 2008
    North East Ohio
    My FN SPR A3G likes the 168 grain BTHP loads best.

    My Remington 700LE likes the 175 grain BTHP loads best.

    Both are a 1:12.

    I haven't shoot much else in my M1A than the standard 147 grain Military surplus loads so I really can't say one way or the other with it. 1:12 twist.

    My Savage 10LE likes the 175 grain loads just as well as the 168 loads. It's has a 1:10 twist.

    You have to try different ammo in your gun to see what it likes the best. Unless your really going long, the difference between the 168 and 175 grain bullets isn't going to matter much as long as you hitting what your aiming at.
    Last edited: Feb 18, 2012
  12. NEOH212

    NEOH212 Diesel Girl

    Mar 25, 2008
    North East Ohio
    This is sound advice. :thumbsup:
  13. Brucev


    Jul 19, 2009
    Best bullet weight will depend upon your intended use. Personally I prefer 150 and 168/168 gr. bullets. I've seldom found any real use for 180 gr. bullets in my area. My preference is for the Nosler Ballistic Tip 150 gr. bullet. In my experience it produced on target results equal to a match bullet with extremely reliable expansion and penetration on game animals such as deer, etc. I have loaded a good bit of the Fed. GMM brass and find it to be unimpressive, the primer pockets open up to the point of being useless after be reloaded only a couple of times.
  14. oldsoldier


    Jun 22, 2008
    I get excellent results with the 168g AMAX and 175g SMK bullets. For powder I use Varget and RL15.
  15. Jason D

    Jason D INFRINGED Silver Member Millennium Member

    Jun 16, 1999
    Mivonks, MI
    I have always been a fan of the 168 grain A-max.
    They have worked well for me in Garands, my M1a, and my Armalite.