Sierra 175 gr HPBT Match

Discussion in 'Reloading' started by F106 Fan, Apr 22, 2012.

  1. F106 Fan

    F106 Fan

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    I have ordered some of the Sierra 175 gr HPBT Match and Lapua brass.

    For a start, I intend to load 42.2 gr IMR 4064 (2.8" OAL) because I have some experience with that specific load and the 180 gr HPBT Match bullet. It shot VERY well - dime sized group at 200m.

    NATO velocity is on the order of 2600 fps and the above load should do something close to that. But Sierra recommends a Viht N540 load of 39.5 gr (2400 fps) as an accuracy load.

    I'm pretty flexible on muzzle velocity. I don't have to match M118LR or Federal Gold Medal Match.

    So, I'm going to order some powder. I have the 4064, Varget and Reloader 15. I am thinking about buying some AA-2520, Viht N540, TAC and BL-C(2) along with some Federal GM210M primers. I want to spread out the Haz Mat fee.

    I'm looking for comments on my shopping list. Things like "That stuff will never work" or "Hey, I shoot that powder pretty good in my ..."

    The rifle is a Steyr SSG 69PI (the green gun) and the twist rate is 1:12.

    It's summer time in Calif so high temperature will be a consideration for the next several months although I can keep the ammo cool for testing.

    Richard
     
    Last edited: Apr 22, 2012
  2. Zombie Steve

    Zombie Steve Decap Pin Killa

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    Why go astray of the combo that was getting you dime sized groups at 200 meters?

    I tend to stick to a 168 grain (either AMAX or SMK) and Varget out to 600 yards. I really don't get to shoot much beyond that. Some complain about how Varget meters, but I've found it to be very accurate and almost totally insensitive to temperature swings.
     

  3. Hoser

    Hoser Ninja

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    There is a reason why the majority of long range (800-1,000 yards) 308 shooters use Varget. It works.
     
  4. F106 Fan

    F106 Fan

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    I haven't been able to duplicate it. It's very likely that it's just me, not the rifle, but either in the reloading or the shooting, I haven't gotten much better than 3/4" at 100 yards.

    I'm going out today to burn up the rest of my reloads and just get trigger time. I only have a 6x scope on the rifle at this time so I'm not expecting much.

    Since the barrel should prefer the lighter bullets, I thought I would just start fresh. New bullet, new brass, new load...

    BTW, I never really had as much success with the 168 gr. It should work fine but I just never stumbled onto a load that the rifle liked.

    No problem trying Varget.

    Richard
     
  5. n2extrm

    n2extrm

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    I am going to have to try Varget in 308. I admit I never have, but I have great luck with Reloader 15. 1 hole groups at 100 yards a little worse at 200 but it is me not the load.

    I can take almost any case a 168 Sierra match king and 42 or so grains of re15 and it shoots.


    I have had great luck with it in 22-250 as well.
     
  6. Zombie Steve

    Zombie Steve Decap Pin Killa

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    Damn. That's like not being able to get peanut butter and jelly to work.
     
  7. Rick from Kali

    Rick from Kali

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    F106 Fan,
    try 41.5 grains of 4064
    Rick
     
  8. F106 Fan

    F106 Fan

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    Yes, I know! I really like the 168 gr BTHP but for some reason, I haven't gotten the groups with it that I got with the 180 gr.

    EVERYBODY gets good groups with the 168 - except me...

    Richard
     
  9. GIockGuy24

    GIockGuy24 Bliksem

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    There are no NATO specs for a 175 grain bullet. M118 LR is an American cartridge that has no NATO specs. "7.62 NATO" is the name of the cartridge, not the load. The latest SOCOM version (Mk 316 Mod 0, 1305-01-567-6944 AB39) of it use selected 7.62 military cases (less capacity than Lapua), the 175 grain SMK (note that the military bullet has a slightly different shape than the current commercial version), 41.745 grains of IMR-4064 and a Federal 210M match primer loaded to 2,810" - 2.830". This load may give slightly lower velocity. It was designed for increased accuracy and to be "low flash."

    The 168 grain SMK works well for me. The old 180 grain SMK had the 190 grain SMK boat tail. The current production 180 grain SMK has the 168 grain SMK boat tail. The 175 grain SMK should be a "better" bullet than the current 180 grain SMK.
     
    Last edited: Apr 22, 2012
  10. n2extrm

    n2extrm

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    Do you know if you have a jump to the lands with either bullet. I had 1 700 that absolutely had to have a .015 to.020 jump with match kings. If you had the touching or jammed into the lands it would group terrible. Just a thought to try and match the jump on the 168 to e jump on the 175's you had luck with.
     
  11. F106 Fan

    F106 Fan

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    So, 42.2 gr of 4064 in a Lapua case should be pretty close. The bullets will be here next week so I will spend some time now to remount my 36x BR scope.

    I wonder if CCI BR primers will work as well as the Federal Gold Medal Match? For some reason, I have well over 5000 of them... I'm not sure how they showed up. Maybe the LGS didn't have any Federal LRP and I bought what I could get. I can always use them in my M1A loads.

    Richard
     
  12. F106 Fan

    F106 Fan

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    I'll be measuring the chamber with the 175 bullet to make sure I'm off of the lands. I would expect that the nominal 2.800" OAL will be well clear but I want to know by how much. I might be loading a little longer; perhaps 2.830" which is what I am doing with my 180 gr.

    Oddly, my 6.5x284 NORMA loads have about 0.060" jump. Not because I want that much but because that only leaves about 0.060" of the bullet inside the neck. If I tried to seat the bullet close to the lands, the BT would be the only thing hitting the neck and the powder would fall out.

    I have agonized about that situation and I simply don't know how to solve it short of using another bullet style and since it really is a one-hole gun at 100 yards, I can't see doing that either. I figure that Savage knows more about chambers than I do.

    OTOH, some shooters want the bullet right on the lands (in fact, chambering the round pushes the bullet back into the case) and they shoot a heck of a lot better than me!

    Richard
     
  13. GIockGuy24

    GIockGuy24 Bliksem

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    CCI BR-2 primers are very good primers.

    Years ago the NRA pressure tested some service rifle loads with military cases only. They went up in one grain steps. With the old 173 grain FMJ M118 bullet they max'd out at 41.0 grains of IMR-4064. With the old version of the 180 grain SMK they max'd out at 42.0 grains.

    Lapua cases give me the best accuracy.
     
    Last edited: Apr 22, 2012
  14. Chuckc

    Chuckc

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    My experience might not work for you because of rifle differences, FWIW here is my 2 cents.
    I shot the 175 Sierra MK since it first became available. The first year I used it a Camp Perry I shot some great scores at 600 yds with 42 gr of AA2520, LC case and Fed LRM primer. This was in an M14. Also had good luck at 1000 yards with the 175, but had to move to 4064 to get decent accuracy.
    I believe the 175 is a better bullet than the current 180. The old 180 with the different boat tail "may" have been as good, but I used up those before making any real comparison.

    Stick powders are better, I think, at the longer ranges but you may want to weigh each round rather than try to throw them through a measure, even good BR measures.
    For example when I moved to the little guns from the M14, I found that AA2330 worked OK out to 300 yards, then I needed Varget for 600.
     
  15. F106 Fan

    F106 Fan

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    Good to know! I went to the LGS and bought 1000 Federal GM210M so I'm ready to go when the bullets arrive.

    Somewhere I read that M118LR might be loaded with Reloader 15. Personally, I have no idea what's in them so I'll start with 4064. But I might run another set with RE-15 since I have some.

    I guess I am interested in longer ranges. I think I'll shoot at the 500 yard RAM and see how it comes out. If I can hit that, the rifle, load and shooter are good enough for all practical purposes.

    I wonder if a 2600 fps 175 gr is too much for an M1A (battle model, not a National Match)?

    Richard
     
  16. GIockGuy24

    GIockGuy24 Bliksem

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    The standard M-118 Long Range does have RL-15 powder. SOCOM wanted a more temperature stable, more accurate cartridge and lower flash powder and went to IMR-4064 in their version of the M-118 Long range. It's called Mk 316 Mod 0, 1305-01-567-6944 AB39 . Now that it's been developed it may completely replace the M-118 LR version that uses RL-15 powder.
     
  17. F106 Fan

    F106 Fan

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    Then I'll be ahead of the game!

    I have had good success with 4064 so there's no reason not to use it for my first batch. I'll probably start with 41.0 gr and work toward 42.2 gr. According to Hodgdon, I can go clear up to 45.6 gr (compressed) so I should be very safe in the 42.2 range.

    I'm looking forward to seeing what I can do with this rifle. I used to shoot it pretty well.

    Richard