7 Rem Mag reload vs factory

Discussion in 'Handloading and Reloading' started by Orion62, Sep 15, 2022.

  1. Orion62

    Orion62 Member

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    Shooting inherited browning 7mm rem mag and having point of impact issues. At 100 yds I was able to put 4 shots in 3in. with Winchester power point 175 gr bullets. Working up a load for this using nosler ABLR in 168gr using federal 215 primers and H1000. Had three test loads at 67 68 and 69 gr charges. I couldn't get my hand loads to hit paper at the same 100 yds I was hitting with the 175gr. My thoughts are a lighter bullet should impact higher yet I know I was hitting low due to the splattering of dirt and rocks on my target rather than a bullet hole. I don't have a chrono to know if they are going slower than factory rounds. Anyone have thoughts on why I'm not hitting paper? I was shooting off a lead sled on the ground in prone position. My plan is to put targets on a bigger backdrop to see just how low and if I'm getting any grouping at all.
     
  2. Shooterbob

    Shooterbob Member

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    Lighter bullets tend to shoot lower than heavier. Move to 50 yards to start maybe? Lighter bullets have less dwell time in barrel I believe the reason less time for recoil .
     
  3. jmr40

    jmr40 Member

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    Use a bigger target to know for sure.

    Any changes to a load will change POI. You could be hitting higher, lower, left or right with a different load. But the difference is usually not significant enough to be completely off the target.

    Just a SWAG, but those are all pretty mild hand loads and should have pretty mild recoil. When a rifle recoil's you get muzzle flip. The barrel will rise slightly while the bullet is still in the barrel. The more recoil, the more the barrel rises, and the higher the bullet will impact on target. I'm guessing that your handloads have much less recoil so the barrel doesn't rise as much during recoil.
     
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  4. .45Coltguy

    .45Coltguy Member

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    Orion62, you're shooting off a bench, correct? How you position yourself can have a lot to do with how you shoot. I'm thinking you already know that.
    What other powders do you have? I had very good luck and accuracy with H4831 and 160gr Speer bullets. There seem to be other thing[maybe] at play here why you are shooting low.
    Any other details?
     
  5. Orion62

    Orion62 Member

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    No I'm shooting in prone on the ground with the rifle in a lead sled in an attempt to eliminate shooter error and just see what the rifle is doing and what it likes. As far as powders I have H1000, ramshot magnum, and magpro as options. I have most in the H1000 and was hoping it would work for that reason as well as finding good reviews on others using it for the 7mag. I liked that it was temp insensitive too but if it doesn't work it doesn't work haha. I'll try shots on bigger backdrop and hope I can get a visual on impacts and I'll definitely be posting results thereafter. I'm still fairly new when it comes to reloading so it's good hear from experience what may be going on in terms of my load or possible recoil differences. Thank you all for the responses!
     
  6. AJC1

    AJC1 Member

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    Barrel timing. Every change in bullet, every change in powder is a new game. This is exactly why you zero with the load you shoot and each one is different.
     
  7. Bill M.

    Bill M. Member

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    Generally lighter, faster bullets shoot lower at 50 and 100 yards.
     
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  8. Seedy Character

    Seedy Character Member

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    69 gr of 4831and 140gr Nosler Partition gives 2 1/2" groups @ 300 yards, in my rifle.
     
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  9. SingleActionAndrew

    SingleActionAndrew Member

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    When all of the sudden I can't keep paper it's usually because the sight came loose. Silly suggestion but worth checking.
     
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  10. kalielkslayer

    kalielkslayer Member

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    My very first thought as well. Check scope bases, rings first. Next check barrel lug screws although if they are loose you usually shoot high. But maybe the lighter bullet doesn’t lift as much?

    I’m with you that you should still “be on paper” unless it’s a tiny paper.
     
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  11. 243winxb

    243winxb Member

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    Try off a bench with rest & bags. Has made a difference in bullet point of impack.

    Faster bullets tend to hit lower on target. As said above.
     
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  12. BushMaster-15

    BushMaster-15 Member

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    168 gr. Retumbo 70.0 Gr. go up by 0.02 Gr increments IF 70.0 isn't doing it . I know people are up 71.5gr. plus but honestly DON'T see improvement over 70.0 .

    My loads are of NO use to any of you as I run H870 @ 100 yd. clover leaf pattern but I have a Commercial Mauser 3000L 4 Th. shot strays 0.5 " It's a Hunting rifle not a target rifle .
     
  13. AJC1

    AJC1 Member

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    OK I don't follow this at all. At 70 grains an incriment is normally 1% or .7 grains. Doing .4 or .5 may be reasonable but .02 grains. Most including myself don't have scales that accurate.
     
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  14. Fishtales

    Fishtales Member

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    Did any factory loads come with this rifle? If so, what kind of group are you getting with them? It took me 3 different boxes of ammo before a found the load that would group tightly in my Ruger .338 WM. I have used that factory ammo ever since. The stuff that didn't work I shot up and used the casings for reloads. I was fortunate that my first reloadings (in 2002) worked best, and I never had to make any changes. My .222 Mag (in 1970) was not as easy as it did not shoot factory ammo worth beans. Two different bullets (100 packs) and three different powders later I settled on Sierra 53 grain Match Kings and either BLC-2 or IMR 4895 (two of the three powders I tried out). Now I was stuck with 95 bullets and a little less than a pound of powder that I couldn't use. Such is the way with experimentation.
    You have made 3 reloads, but if I understand correctly you made each one with a different powder charge. Those are 3 different loads. Try 3 loads all with the same powder weights and try again.
    I agree with the post about shooting off the bench even with a lead sled. Good luck and be safe.
     
  15. tominboise

    tominboise Member

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    I don't know if you can find any, but Federal Premium ammunition with the 160gr Partition has always performed very well, like 1/2MOA, in my Winchester M70 Classic. When my rifle starts shooting inaccurately, I shoot a group of that load through it to determine if it's a rifle problem, or an ammo problem.

    As mentioned, I would try shooting off a bench and not use the lead sled. I am not sure that restraining the rifle doesn't make them shoot oddly. Benchrest shooters let the rifle free recoil on the rest. One can't do that on sandbags with a hunting rifle, but one can get a consistent set up. If recoil is a problem, I put a sand bag between the buttplate and my shoulder.

    I have used RL22, RL25 and H4831SC all with good success in my 7 mag.
     
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  16. sharp tooth

    sharp tooth Member

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    Those grain bullets are on the high side for 7mag I believe I use 140-150 something I’d have to look could possibly be heavy bullet not stabilizing in flight??
    I also have a tendency to shoot my 7mag low off hand but in a lead sled I was Inch high at 100 yards I believe is where I originally had it zeroed
     
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  17. Blue68f100

    Blue68f100 Member

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    What is your twist rate on the barrel? That will dictate what gr bullet to use for best results. Also check the barrel for cu fouling, and throats being burnt out if you have a bore scope. If the previous owner was shooting hot loads, the barrel in only good for 1200-1500 rounds.
     
  18. AJC1

    AJC1 Member

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    I know leverguns are very sensitive to how they are held and point of impact. I believe most others are not near as picky. Maybe the cheek weld and eye to optic are different if the impact is consistently different.
     
  19. Blue68f100

    Blue68f100 Member

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    Are you using a scope or open sights? Browning BAR is one of the few that really manages (reduces) the recoil. When I first got my Rem 700 in 7mm Mag I went through 2 scopes before I bought a high end scope for it. The cheap scopes would not hold their zero it literately shook the inside apart. My VXIII has held up for nearly 40 yrs and still going.
     
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