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  1. Marine52

    Does any ballistic app or software have a graph that shows the LOS in relation to the bullet trajectory?

    Most ballistic apps show the bullet trajectory in relation to the LOS. For example, Ballistic AE generates a table with the “bullet drop,” but that figure is just the bullet path in relation to the LOS. And as @DocUSMCRetired said above, the AB app does the same. If you hit the “ballistics...
  2. Marine52

    SAC Sizing Die & Zero Press

    I don’t think the OP was implying that he was comparing the numbers from the two different seating comparators. He said that the AO seating depth gauge indexed off the shoulder and the Hornady/Stoney Point comparator indexed off the case base. If his case bump was not consistent he would adjust...
  3. Marine52

    SAC Sizing Die & Zero Press

    So you did get bump with the Area 419 -2 shellholder and ”a shim”. Sounds to me like you have a very small chamber (at or below min SAAMI headspace) on your 300 PRC. I would get a go gauge and check the rifle headspace. If that’s the case, you may have to trim some metal off a standard...
  4. Marine52

    Direction of sun changes my zero!

    ^^^This is correct. This only applies to iron sights and the term “lights up, sights up” refers to raising the front sight when the sun is out which brings the point of impact back down. The term originated with NRA High Power and Service Rifle shooters 50-60 years ago.
  5. Marine52

    Question on Redding competition shell holders

    I know what rifle chamber headspace is and I know what case base-to-shoulder datum length is. But how do you decrease case-to-chamber headspace? I’ve never heard of this term. I‘m ready to learn. Show me a reference in a known loading guide, manual, or any quote from a reputable shooter who...
  6. Marine52

    Question on Redding competition shell holders

    @obelisk57. This thread is old and the info below is pretty much a summary of earlier posts but I hope it helps. There is so much confusion on the use of Redding comp shellholders. Primarily because of Redding’s worthless description/instructions on their use From Redding: “ Each shellholder...
  7. Marine52

    Question on Redding competition shell holders

    I think you may have answered your own question. The RCBS and Lee SH’s in theory are .125 exact but can be out of spec. I would go ahead and get a standard Redding SH. They’re only a few bucks. And yes, once you have a die set up and have the bump you want, don’t switch shellholders.
  8. Marine52

    Question on Redding competition shell holders

    Just think of the standard .125 shellholder as another shoulder bump step option. The Redding +2 SH is .127 and if that happens to size a case with the base-to-shoulder datum measurement .002 longer than what you want, then that means the standard .125 SH is just right.
  9. Marine52

    Should I upgrade my RCBS press?

    The press you have is a good one but if it has a lot of flex in the linkages that will result in inconsistent shoulder bump as you are experiencing, assuming your other loading steps are consistent. For example, consistent lube on case. A new press is nice and the Nexus should give you much...
  10. Marine52

    New rifle issues with finding load

    Clean the rifle. Get all of the carbon out. Especially the ring in the throat. consistency is key. If you think about it, starting with a clean carbon-free bore is a baseline for accuracy. With a dirty barrel, where is your baseline? at the start of every range session, shoot fouling...
  11. Marine52

    Bad Hornady ammo 300PRC, 1/2 MOA to 6 MOA based on lot number.

    You missed the obvious point of my post. The OP was concerned that the wave patterns on his case necks may be responsible for his groups opening up. However, most experienced shooters know that this sine wave pattern on the necks indicates that you are getting a good bullet release. So that...
  12. Marine52

    Bad Hornady ammo 300PRC, 1/2 MOA to 6 MOA based on lot number.

    Jack Neary describes the wave pattern you are experiencing at the 13:50 min mark in this video:
  13. Marine52

    Bad Hornady ammo 300PRC, 1/2 MOA to 6 MOA based on lot number.

    The “wavy marks“ that you describe on the case neck (many experienced comp reloaders refer to this as a carbon sine wave pattern) are normal and show that you have good clearance between the case neck and chamber. The sine wave shows that some of the gases escape into the chamber before the...
  14. Marine52

    Area 419 Zero Press vs SCA Nexus Press

    What you are saying is true for most shooters but, to answer your question, there is a small percentage of shooters that can and do strive to exploit these inconsistencies. For example, inconsistent shoulder bump can lead to ignition inconsistencies and will produce jump variance. It’s all a...
  15. Marine52

    Area 419 Zero Press vs SCA Nexus Press

    I agree to an extent. Consistency is the key as it is to every aspect of loading your own ammo. Premium presses like the Zero, Nexus, and Prazi promise consistent and precise movement and final position of the ram when it is fully extended. If your press is flexing differently as a result of...
  16. Marine52

    Correcting ballistic drop at different zeros?

    You can do it fairly easy but it’s not something regularly done since most serious shooters have ballistics apps. 1. Convert the inch figures to MOA or Mils for each yardage (for example 1.88” at 100 yards is 1.80 MOA or .52 Mils) 2. If using MOA, zero out the 100 yard MOA number by...
  17. Marine52

    Load development or not?

    this is absolutely true. i started shooting F-Class over ten years ago with a nice GAP 308 rifle using factory ammo. I learned a lot but never shot well enough to win medals. For my next two custom rifles I did a lot of research. I copied what the guys were using who won the US Nationals...
  18. Marine52

    Dumb question - DA/pressure and velocity

    You mean high, hot, and wet (humid), I believe.
  19. Marine52

    At What Distance Should I Use Ballistics Calculator

    Ballistic calculators/apps are much more useful than just for providing angular corrections at distance. I use the app to show the specific load’s sensitivity, at any distance, to density altitude conditions, wind velocity and direction, etc etc. For any distance, the app shows me the...
  20. Marine52

    Bushing or mandrel or both?

    Thanks. I didn’t do an empirical test like you but my precision results are similar. I dip the necks in imperial graphite dry lube before mandreling and then apply neolube before bullet seating. Seems to work well
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