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Recent content by Doom

  1. Doom

    Sierra 6mm 107HPBT Matchking caution

    TO be clear on the "C", when the C is part of the part number as in 2200C it is a 250 or 500 round packaging. When it shows up as "Hollow Point Boat Tail - Closed Nose (HPBT-CN)" in the description the part numbers will be different. The first bullets to use this closed nose were the 177 and...
  2. Doom

    Barrel wear Vs velocity/weight/energy

    Within a given cartridge, in this case the 308 Win, the primary issue with barrel life will be how hot the barrel will be allowed to get as this is the primary cause of the material degradation in the throat. Since the amount of heat generation in a given firing is related to the mass of powder...
  3. Doom

    223 at 300 and 500

    About what my 700 Varmint (stock barrel) will do with 53 SMK. I tend to agree with @RegionRat that the 77 SMK is probably worth a try. Your ES can be responsible for about 1.2" vertical at 300yds so it may well be the issue here. N540 may be part of the issue. It's a double based powder and...
  4. Doom

    Low Recoil AR Load

    Thank you for your service. I am a few years behind you so I ended up not serving but certainly respect those who did.
  5. Doom

    Low Recoil AR Load

    @N_Turs, I wasn't familiar with the style of matches you were referring to but after looking them up they mirror some of our action shooting local matches. I am not sure exactly why you are so hung up on low recoil. It's one thing to look for low recoil due to physical impairment but if it's...
  6. Doom

    Quick Load

    You need to understand the difference between the two sources of data. The Hornady data is based on actual test firing of the specified components in an instrumented and especially designed barrel designed to indicate the maximum pressure that would be obtained in the smallest chamber meeting...
  7. Doom

    Deprime before or after tumbling? (Newbie)

    Corn cob media is not the most likeable tumbling media. Walnut media such as the Lizard bedding from Petsmart is much easier to use and does not typically plug flash holes. I personally deprime the cases before tumbling to keep as much primer residue out oof the tumbler as possible to limit the...
  8. Doom

    .308 win - reloading same brass for bolt action and an AR-10

    You absolutely can run the cases in two different rifles but it comes with a price. Since one of the chambers will require more sizing than the other you will be oversizing the case for the larger chamber. This means you'll be setting the shoulder back more than necessary for the tighter...
  9. Doom

    Reloading for shorter barrels?

    Didn't mean to start a fire storm with my comment. Shorter barrel accuracy may/can benefit from faster powders for the reason I stated but @spife7980 is correct that the powder still has to match the bullet mass and chamber/bore volume expansion rate to be suitable. There are other factors at...
  10. Doom

    Reloading for shorter barrels?

    Velocity is only a minor factor in stability until the SG starts to drop below 1.3. Then the impacts of ambient conditions and BC reduction become more significant. One thing to consider on accuracy is that slower powders take longer and more barrel length to burn out completely. Unburnt...
  11. Doom

    Need UPS for FX120i

    Zero drift is a function primarily associated with the temperature of the electronics in the scale/balance. It comes from two sources, the initial powering up of the electronics when the scale is turned on and changes in ambient temperature. It is important to remember that the drift is not...
  12. Doom

    Retesting some reloads today. Very odd results!

    @sig2009, if I interpret you correctly you shot multiple groups of 5 shots and got sd's ranging from 2-6 fps. If this is correct and your ES was essentially 2xSD then you were loading very consistent ammunition. That's true even if the loads were different. On the second loading if the same...
  13. Doom

    Retesting some reloads today. Very odd results!

    Your comments on good/bad have merit. If the rounds are loaded at different times then those factors and others all come into play as they tend to indicate some type of inconsistency in the load process. That may well be powder charge seating depth, brass prep, orientation of the rounds prior...
  14. Doom

    Retesting some reloads today. Very odd results!

    You've been given the explanation that relates to sample size and it is also an issue of not understanding the concepts of sampling and expectations. You are looking at test data that is subject to random selection and errors. You are not considering what the test data means in relation to the...
  15. Doom

    POI Channge @100 Yards With a 'Similar' Load

    The primary change is most probably due to barrel harmonics causing the barrel release point of aim varing between the two but recoil is probably playing a minor roll. As for external ballistics the 100yd variation due to only the velocity/Ballistic coefficient difference is about +0.2" if you...
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