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I would put the same data into a different ballistic app. Compare to your scope’s app. They should both predict approximately the same corrections at all distances. If the other app is correct, but not your scope app, it’s possible that the problem is with the scope app. If neither matches your...

You said that you verified your distances with a range finder. Did you verify your velocities with a chronograph?

“Optimal” will depend on your circumstances. For instance, if you have a lower powered airgun, optimal will likely mean lighter slugs. Outside of those other limiting factors, I consider optimal to be 40gr@1060fps.

Yes. Just now registered.

I’m considering going to this GP match. I’d like to know what the Troyer difficulty will be. An exact 36T for both rifle and pistol would make 100 GP points available to the winners of each class. Since I have a number of GP matches to choose from each year, I now tend favor those that are best...

After all the pluses/minuses, I still like my Delta Wolf. The thing that irked me the most about Daystate’s follow through was that the Delta Wolf was originally sold as having Bluetooth connectivity, which should have led to some interesting apps to work with it. That never happened and no more...

That depends on the drag model, BC, and distance that you are shooting. For shorter distances, you are correct, but for most any airgun slugs, once you get out to 500 or 600yds, a muzzle velocity of 1000fps will have less wind drift than at 950fps. When shooting at 200+yds, with an RA4 BC of...

I know they have other useful capabilities, and the 1100yd rangefinder would be great, but if the Zulu is zeroed at 50yds, the compensation won’t get you anywhere near 1100yds with airgun ballistics. Not even 300-600yds.

A cool capability of digital scopes is when they have the feature where they utilize a built in ballistic app and laser range finder to do automatic vertical compensation. As far as I know, this feature typically has insufficient compensation for >200yd ELR with an airgun. So we are stuck with...

I’m considering going to this GP match. I’d like to know what the Troyer difficulty will be. An exact 36T for both rifle and pistol would make 100 GP points available to the winners of each class. Since I have a number of GP matches to choose from each year, I now tend favor those that are best...

Not sure what someone else implies when they say a “sub 3.5moa overall gun”. If the circle of standard deviation of the gun’s inherent accuracy is 3.5moa, and the shooter does perfect shot executions (stability, ranging, wind reading), they will get clean hits on approximately 50% of the 55yd...

If you are shooting in AAFTA Hunter Division, more than likely, you will have your scope set at 16x. The chart you show indicates 1.5moa between stadia lines at 16x. Assuming the 16x mark is actually correct (not always true), if your ballistic app says to hold 7.1moa up: 7.1moa/1.5moa per...

Your conclusion was based on a faulty comparison. Use the same airgun and keep all settings the same, including pressure and hammer weight. Same projectile. Swap barrels for the comparison. Compare the 27.5” barrel with 33.5” barrel.

1:19 is unlikely to adequately stabilize the 80-100gr slugs that you are looking for.

Long slugs typically require a faster twist rate. Otherwise, accuracy can suffer. Do you know what your twist rate is?

For airguns, over 100yds is often considered ELR. The Oregon match consisted of the following: 140yd, 2in square, 5 shots 166yd 3in square, 5 shots 187yd 4in square, 5 shots 250yd 5in square, 5 shots 300yd 7in square, 5 shots Cameron had a 68% hit rate. There were no warm up or practice shots...

When we used to hold GP matches at the Morro Bay course, we did not use general timers for everyone, even at the 2021 National, no timers. I always gave the threat of putting a timer on any squad that had empty lanes in front of them, and had squads backing up behind them. But usually not...

I go as far as .0005 to .001 under groove diameter. The lands will usually bulge/squeeze the lead out just enough to seal the groove areas.

Best that you make the distinction between lb weight and lbm. A slug is 32.17405 lbm. There are 7000 grains in a lbm. 7000 x 32.17405‎ = 225,218 There are 225,218 grains in a slug mass. So, either way you look at, when velocity is in fps and mass is grains, the kinetic energy formula: 1/2 x...

If we were on a planet with 1/2 the gravity of earth, would an airgun’s kinetic energy be 1/2 what it was on earth? Answer: no Muzzle energy of a projectile is kinetic energy and is not affected by gravity. I don’t need the acceleration of gravity to calculate kinetic energy. The kinetic...