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Recent content by SIDS01

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    Ruger Precision Rifle Discussion

    I get mine from Possum Hollow. They're not listed many places, so I just call. They're cheap, less than $40 delivered, and easier to use than the universal ones.
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    Need expert advice on target size/distance placement

    We set up a 1200-2300 yard range 6 years ago. The target locations are 20-40 minute hikes after 10-15 minute drives each way. It's private land, so they're permanently set. We went with 1/4" mild steel suspended on chains at points 1/3 the way from the top and sides. Cheap hit indicators...
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    New Long Distance Shooter

    6.5CM hands down. The ammo is cheaper, the barrel will last twice as long, there are far more guns suited to that distance available and it's better training. 1500 yards is pretty much the end of the line for the 6.5CM on a silhouette and the wheels have fallen off at a mile but it'll still be...
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    Ruger Precision Rifle Discussion

    Yes https://forum.accurateshooter.com/threads/ruger-rpr-barrel-shoulder.4093487/
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    Laser vs A-Tip Velocity?

    With the extractor groove, the measurements need to be the same case before and after. Even on the same case they'll need to be clocked. I align with something prominent in the headstamp like the first letter of the manufacturers symbol. The measurements require a blade micrometer with a...
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    Laser vs A-Tip Velocity?

    You're heading the right direction. Figuring out how solid primary extraction screws up bolt lift as a pressure estimate was insightful. Most just want to convince themselves they're not over pressure and whatever problems they're having are not self inflicted injuries. I also thought the...
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    Laser vs A-Tip Velocity?

    Twist rate is another problem. The internet has latched on to Sg>1.5 is gtg. Maybe for PRS. With smaller bores, high velocities and barrel twists can skate into RPM problems. With jacketed bullets, below 1.5 is where more serious losses in BC and BC variation often start. The BC will...
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    Laser vs A-Tip Velocity?

    This is the final bit that's being ignored and it's the most important. The full error budget includes velocity and BC spread components. The relative importance of each component changes with distance. At 100 yards, the differences in the individual shot velocities and BCs won't be seen. By...
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    Laser vs A-Tip Velocity?

    That's some serious navel gazing.....
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    Laser vs A-Tip Velocity?

    A bit of trivia is for cartridges with ELR overbore ratios, 100 fps takes about 10,000 psi. PRS stuff is closer to 150 fps for 10,000 psi. Another STH gem that's being ignored is jacketed bullets won't take whatever pressure you decide to operate them at. Lapua or boutique brass will operate...
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    Laser vs A-Tip Velocity?

    5 shot averages. They weren't great, between 20 and 30 fps on the ES.
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    Laser vs A-Tip Velocity?

    On the jump/velocity questions, I read something about longer jumps giving lower velocity spreads in a fleet of PRS guns. I was working on a 7/300PRC set up for 190s at the time. Those results were: Jump, Avg Vel, ES, SD 10 Jam, 3025, 11, 4.9 25 Jump, 3002, 10, 4.3 50 Jump, 2999, 14, 5.2 75...
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    Laser vs A-Tip Velocity?

    On the short throat solid/jacketed velocity question, I tested the 285 Flatline against the 285 ELDm in a 33XC years ago. The chamber was set up for solids. The Warner/Hornady comparison was pretty unique because almost all of the length difference showed up ahead of the ogive. The bullet...
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    Laser vs A-Tip Velocity?

    What's the round count on the barrel? Is the free bore dimension available? I think decreasing the jump is heading the right direction, but you might not get the results you're after until you actually jam it 5 or 10. The jam is where the most pronounced increase in pressure happens. 10...
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    375 RUM- Gibbs (Box Monkey Express)

    Tracking is your friend. If you can add stand offs to get the bag rider parallel to the bore and the bipod mount square to it, the gun will recoil closer to straight down the bore. Moving the top of the recoil pad to just over the top of the bolt will align the support with the recoil impulse...
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