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Thread: Help choosing powder weight?

  1. #1

    Help choosing powder weight?

    I've been working up a load for my 22-250 using 50 grain Vmax and H4895 powder, been out this morning again to try some more loads, I have worked up in 1/2 grain increments from 33 up to 37, there have been no pressure signs on the cases and all have shot well. This is where the indecision lies, below is 4 targets from 120 yards I used this morning, I shot rounds containing 34.5, 35, 36, 37 grain weights but no single weight seems to stand out, I think the third shot every time was me rather than the bullet. I only use the gun for hunting not target shooting but can't make my mind up on which to use, drop at 280 yards only seems to differ by around1.25 inch from 34.5 to 37, so would the hotter round be better as it will be slightly flatter? Looking forward to some advice( be gentle I'm only a novice), Tom

  2. #2
    Top right. Try fiddling oal a bit but the group's good.

    Sent from my XT1032 using Tapatalk

  3. #3
    I don't think you can draw conclusions from a 3 shot group. I try to find consistency in POI across 3 groups, at 0.3gr increments. The size of the individual group is less important as long as they are within say half inch or so.

    That way any inconsistencies in charge weight or temp variations don't change poi.
    Somewhere between 35 & 36 there's an inch change in poi, so avoid that region for sure.

  4. #4
    Hi Simon thanks for the info, I like the point about looking for the consistency over group size, Just to clarify the picture above is the wrong way around, it should be turned anti clockwise by 90 degrees, so all shots were above the bull. Tom

  5. #5
    Quote Originally Posted by simonl View Post
    I don't think you can draw conclusions from a 3 shot group.....
    I don't agree. I have lightweight barrels on my rifles and do all my load development using 3 shot groups. Regards JCS

  6. #6
    Quote Originally Posted by jcampbellsmith View Post
    I don't agree. I have lightweight barrels on my rifles and do all my load development using 3 shot groups. Regards JCS
    Agreed, even on heavy barrels as it works just great to determine loads worth looking at from ones that are not.

    Sent from my XT1032 using Tapatalk

  7. #7
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    I would suggest 1gr groups are too big to seek another node. I also would not do yourself down on the spread. I would repeat the test, but I would put in finer increments - if you're looking for speed, certainly look at 36.5 and 37.5. The other thing to consider is speed variance in the group - are you chrono'ing these? Or just go with 34 as it seems fine......!
    Last edited by Eric the Red; 09-08-2016 at 09:44.
    Nooooooooooooobody expects the Spanish Inquisition!! Our main weapon is.........

  8. #8
    Quote Originally Posted by Barkingsnake View Post
    Agreed, even on heavy barrels as it works just great to determine loads worth looking at from ones that are not.
    Agree that 3 shot groups can allow you to exclude lousy charges, but assuming that the 3 shot cloverleaf for 34.5 (top right as shown here) is what that rifle will shoot repeatedly is very likely to lead to disappointment...
    Wyelyetom - Suggest you take that 34.5 & rather than tinkering with seating depth etc, fire a couple of 5 shot groups to get an appropriate level of confidence in your results before drawing conclusions.

  9. #9
    I shoot three shot groups with my hunting rifles but I will shoot with one load only for 60 rounds. If I don't get what I like, I change something. That aside, the OP might want to take what he feels is the most accurate load and put it to the field. If it is suitable, he has his load. If it is wanting, he can change it.

    Brain working a load seldom works as well as field working a load.~Muir

  10. #10
    Quote Originally Posted by simonl View Post
    Agree that 3 shot groups can allow you to exclude lousy charges, but assuming that the 3 shot cloverleaf for 34.5 (top right as shown here) is what that rifle will shoot repeatedly is very likely to lead to disappointment...
    Depends on the rifle and the user.

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