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What you are saying is true for most shooters but, to answer your question, there are 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...

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...

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...

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...

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

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...

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

Nice research. Thanks much. You may have already answered this but didn’t see it. Did you moly-lube the necks before mandreling or just before bullet seating ? Or both? Thanks.

For PRS-size targets, you’re not going to see much of a difference ballistically. Just go with the bullet/load that your rifle prefers.

Yes the Rodzilla and SEB (SEB seems to be most popular nowadays) front rests are amazing for stability, ease of leveling, return-to-battery, and aiming adjustments w/o muscular interference. Combined with a rear bag like the SEB Bigfoot, you are at Benchrest level stability. F-Open is a deep...

Yes, 1.7” low at 25 sounds about right but that’s a roundabout way of doing it. Normally, just enter 100 yards as your zero and put range increment at 25. The calculator will show your required 25 yard point of impact for a 100 yard zero. With your sight height of 2.8 inches, the bullet...

Here‘s a related thread you may find interesting: https://www.snipershide.com/shooting/threads/official-accuracy-international-cold-bore-return-to-zero-thread.7205557/

Here’s the elephant in the room. Is this is factory rifle? Have you removed and reinstalled the barrel before with any zero shift? Factories usually torque down the barrels way more than needed so that ordinary owners cannot remove them easily. When you put the barrel back on, recommended...

Assuming your load is solid, as you say, recoil management is crucial. At 1000, you must have consistent cheek pressure, shoulder pressure, and trigger pull. Also, rifle tracking in the rear bag is important as well as what your bipod is resting on. Before your first shot, put downward...

@Cheetah, here’s the errata sheet for the first edition: http://www.dexadine.com/download/mccoy10.pdf

Yes you will enjoy McCoy’s book. It is the Bible of exterior ballistics and the kinematic equations of projectile motion. Litz is a very good ballistician but, as said above, his books are purposely not as rigorous mathematically.

Yes 6.5 Grendel is light recoiling, accurate out to 500 with long barrel life. It falls short of the 6.5 creedmoor ballistics, as I’m sure you’ll hear, but the barrel life is better and it sounds right for your needs. I have one in an AR and it is my fun gun. The 308 will have good accuracy...

read @spife7980 post #11. Find your rifle headspace and work from there.

The 1.4666 - .0070 shown by SAAMI is not the headspace. These are the SAAMI cartridge dimensions. The SAAMI rifle headspace specs for a 223 rem are 1.4636 (min) to 1.4736. (max). A Go Gauge should be at SAAMI min. Get a Go Gauge from a good company like Manson. If your rifle bolt will not...

You need to find your rifle headspace or else you will be chasing random shoulder bumps. Get a Go Gauge for the 223 rem. I use a go gauge and then use aluminum foil on end with a smidge of paste to find exact headspace (reg foil is about .0004 - .0006” and heavy foil is right at .0008”). I do...