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  1. Doom

    Opinions ?

    I failed to mention in my post that when you find the point where you add powder and get no increase in velocity it's time to back off.
  2. Doom

    Opinions ?

    Increasing powder charge will actually decrease the required barrel length for burnout because the maximum pressure will increase increasing the burn rate. If you are truly not seeing an increase then the most likely explanation is that the ignition and burning rate of the powder is changing...
  3. Doom

    Case Volume differences, Where to start?

    Reading your post it sounds like you are comparing new unfired cases with fired resized cases. Basically a worthless comparison. Best approach is to measure fired brass of each brand or use resized fired brass for the comparison. If I misinterpreted that when ignore my post!
  4. Doom

    AB Quantum Bullet Library Listing Question for AAC 77 Grain OTM

    Out to 300 yds the POI isn't very sensitive to BC so about any 77gr OTM will work. Beyond that you can work the DOPE out which will probably be required regardless.
  5. Doom

    Does Barrel Vibration Exist and Does it Matter

    I'm posting this here in Reloading because it comes up now and again in load development. A lot of information and misinformation is out there. Yes it matters. The attached link to a Paper by FN covering a redesign of a SAW barrel is probably one of the best that is available that demonstrates...
  6. Doom

    Seating deeper after using Lee FCD

    Wow can't believe no answers. You need to pull the bullets and and resize the neck. Pushing the bullet down with the crimp will damage the jacket. How much depends on the amount of crimp.
  7. Doom

    Bad SD and ES but good group...

    The answer is guarded yes. To have low standard deviation you need certain conditions to be met. Primarily this is consistent powder ignition and consistency in how the bullet engraves in the rifling. To have good consistent groups you also need quality bullets with good consistency, like...
  8. Doom

    Bad SD and ES but good group...

    For what it's worth I would pick 38.7gn or 39.0 (or a load in between) as a test with +/- 0.2 gn on either side in absence of any other information. 5 shot groups. See if the POI repeats. If it does then you can work on seating depth and see if the groups tighten up.
  9. Doom

    Bad SD and ES but good group...

    As far as methods I tend toward mean radius. CEP (Circular Error Probable) is another that comes to mind. Group size is only determined by 2 shots no matter how many are fired. I understand how people fall into looking at group size and obviously in competitions where group size determines the...
  10. Doom

    Bad SD and ES but good group...

    @straightshooter1 and @Old Man with Gun have actually posted what we should have started this thread with. That is defining what degree of precision is needed for the intended use and what variables come into play. It's easy to say you want as precise a rifle as possible but without some...
  11. Doom

    Bad SD and ES but good group...

    Your SD and ES variation in velocity is undetectable on group size at 100 yds or meters. In most centerfire rifles a 100ft/sec (30 m/sec) only varies the point of impact about 1 caliber. The velocity effect is only one factor in the dispersion equation as in reality many things (bullet, case...
  12. Doom

    Maximizing accuracy

    Also each references a maximum safe load, which may or may not be at maximum pressure. In fact if you read Hornady they will describe their method and it is likely the published load is below maximum because they chart velocity. IN many cases the load could be almost 50 or 100 fps below the...
  13. Doom

    SAMMI spec

    2.015" -0.020 is 1.995" to 2.015". Min chamber is 2.025" so you have a minimum clearance of 0.010". Tolerance on case is only negative a dimension are Maximum Case lengths.
  14. Doom

    Dirty brass

    Wet tumbling is an iffy method because you are never sure exactly what minerals are in the water which may affect the brass. Dry tumbling in rice is probably the best alternative for you. If your issue with the necks is external then you can wipe them with something like this...
  15. Doom

    Seating question

    Sounds like your bullet may be hitting the seating stem with the point and not the ogive.
  16. Doom

    Manual dump + trickle

    No need to measure weight of each manual throw.
  17. Doom

    Why do people load so hot?

    I should have mentioned that best precision typically occurs with >90% or so of case capacity. This provides consistent ignition of a uniform powder column so most loaders are going to be loading on the higher end of recommended load ranges.
  18. Doom

    Why do people load so hot?

    There are probably two basic reasons. The first is "because I can" which needs no explanation. The other is the only gauge on pressure is problems with case/primer so we tend to base maximum pressure based on individual component capability as opposed to the SAAMI pressure rating which is...
  19. Doom

    Wild ES with Tac 223 Load

    Unfortunately you really missed the boat. You told us it's an AR, the powder charge, and your ES, and pretty much nothing else. Yes you did tell us later it a Hornady 55gr FMJ. Without the actual load data, primer, case manufacturer, SD and number of rounds it's impossible to analyze your...
  20. Doom

    Do I need a small base die to save my brass? 6.5CM

    The rings on the brass above the case head (just above the rim and the ones higher up) lead me to believe there is something going on with the chamber. While it sounds like you are potentially having issues reusing the old brass but I would suggest buying bow of factory ammunition (quality)...
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