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  1. J

    Range Report Trying to understand BC calculation formulas

    Re: Trying to understand BC calculation formulas Take a look at the formulas here: CD and KD Look at the formula right before the "KD and CD" heading about half way down the page. As you can see, you can find the acceleration from the BC, the G function, density and gravity. My BC...
  2. J

    300 Win Mag guys....

    Re: 300 Win Mag guys.... Mine doesn't like H1000 at all. I had a 308-8mm wildcat years ago that ran very well with it and had 8 pounds left over. Tried it in a new 300 Win Mag and got 1.5" groups with 220 gn Sierra MKs. Switched to Reloder 25 with the same bullet and seating depth and got...
  3. J

    Gunsmithing Cutting your own quality barrel and saving money?

    Re: Cutting your own quality barrel and saving money? I think you would be much better off paying a barrel maker to give you the contour you want. Then you would have the best of both worlds -- it would be right and the way you want it. Of course, you're paying more money eliminate your...
  4. J

    rcbs die?

    Re: rcbs die? I buy Redding for the most part. I'm sure there are some custom manufacturers that may be better quality, but I find the Redding a big step up from RCBS. I used to (>20 years ago) by RCBS only. Then I noticed a step change in their quality. Things like the sloppier...
  5. J

    Range Report Miller stability

    Re: Miller stability Which calculator are you talking about? This one: JBM - Calculations - Drag/Twist?
  6. J

    Range Report Miller stability

    Re: Miller stability Just a quick note -- it's not "JBM's Ballistic FTE". I have nothing to do with the product you purchased. Any questions related to how it works should be asked of the author -- that's why I don't answer questions about this software. Thanks! Brad
  7. J

    Range Report Calculating zero shift in different conditions?

    Re: Calculating zero shift in different conditions? I agree, it is a very small effect. I don't think I'm a good enough shot to see it at my typical zero range. It obviously does affect your shooting for longer ranges. As for ballistics calculators, all the range cards on my website...
  8. J

    need help IDing a part

    Re: need help IDing a part My Timney had the little pin in it to hold the sear and spring in place. The little pin isn't used. Just put the spring in, the sear in and install. Brad
  9. J

    Gunsmithing Feeding problem with AICS 1.5 and 300 Win Mag

    Re: Feeding problem with AICS 1.5 and 300 Win Mag Here is the fixed magazine: You can just barely make out a little tweek on the forward part of the lips. Brad
  10. J

    Thread muzzle = accuracy load change

    Re: Thread muzzle = accuracy load change I would think (i.e. I can't prove it) that it will affect the way the rifle recoils. This may also change the point of impact a bit. My 0.308 shoots about 0.75" low at 100 yards when suppressed. Brad
  11. J

    Looking for 300Blk powders

    Re: Looking for 300Blk powders I've tried a couple of powders and AA1680 worked the best for me. I'm shooting it with small rifle primers and Sierra 220 grain Matchkings. I did have to swap my buffer out though -- the Spike's buffer was over the standard weight. Once I went to a standard...
  12. J

    Cleaning dies with stainless media/tumbler?

    Re: Cleaning dies with stainless media/tumbler? I certainly wouldn't put two dies in at the same time. I haven't tumbled a die before and I don't intend to. I would ask why you feel the need to tumble them? I find that a soft cleaning brush with some of your favorite cleaning fluid does...
  13. J

    Gunsmithing Obermeyer

    Re: Obermeyer I've only got one Obermeyer barrel and I haven't even shot it yet. I have used Pac-Nor, Hart, Lilja, Shilen, etc. I will say that the Obermeyer barrel had the worst exterior finish I've ever gotten on a barrel. I had to turn about 0.020" off the shank to clean up the tooling...
  14. J

    Gunsmithing Feeding problem with AICS 1.5 and 300 Win Mag

    Re: Feeding problem with AICS 1.5 and 300 Win Mag I opened up the feed lips last night and it does feed now. I made a tool like the Brownell's tool and it worked well. It didn't take much to make it work. I'll post a picture tonight. Thanks for the help everybody. Brad
  15. J

    Gunsmithing Feeding problem with AICS 1.5 and 300 Win Mag

    Re: Feeding problem with AICS 1.5 and 300 Win Mag I checked the bedding -- there's room under the recoil lug. As for the length of the latch, would it be short? It appears as though the spring tension of the latch is what is pushing the front of the magazine down; there isn't a whole lot to...
  16. J

    Gunsmithing Feeding problem with AICS 1.5 and 300 Win Mag

    Re: Feeding problem with AICS 1.5 and 300 Win Mag Here you go. The round is a dummy. It does have a bullet, just no powder or primer. Brad
  17. J

    Gunsmithing Feeding problem with AICS 1.5 and 300 Win Mag

    I just got a AICS 1.5 stock for the 300 Win Mag that I have put a Remington 700 Long Action in. The problem is that when I insert a magazine and try to chamber a round, the bolt picks up the round correctly, but when the bullet hits the feed ramp, it stops and the rear of the round drops and...
  18. J

    Range Report Calculating velocity from drop data

    Re: Calculating velocity from drop data <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jeffersonv</div><div class="ubbcode-body"> Oh yeah, I input a BC of 590(G1) to try to match the curve. My results say the BC is 550 however. Just a JBM glitch I suppose...
  19. J

    Rifle Scopes Just want to make sure I understand "mil"

    Re: Just want to make sure I understand "mil" I have to use trig to explain it -- maybe this will help, maybe it won't. The distance to a target and the height are related by this equation: tan(angle) = height/range where "height" is a drop, height of a target, or just some length at the...
  20. J

    Gunsmithing Winchester Pre 64 Heavy Tac Build

    Re: Winchester Pre 64 Heavy Tac Build New Mexico imported a bunch many years ago (60s?). They have been doing very well on the Army's White Sands Missile Range. The picture of the Oryx looks like it's up in the North part of the range or it certainly could be private land. A number of...
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