VooDoo Precision

We don’t service or clean timepieces;

We do service and clean irises, dioptres, and Centra sights, built with the same precision and quality as timeless classics.

They might be old, built to last a lifetime.

“What’s One Point Worth?’ Just ask the winners.

Where did that shot come from?! Same hold, same wind, perfect release we hear it all the time!!

Conformity in BC is critical; the more closely each projectile fired matches its peer in ballistic shape, the more it ensures conformity in drag and the same flight profile to the target.

On average, every 20th round will print way outside your group, in no man's land. Roll the dice, and you may have a run of groups well within your rifle's capability or smaller, and print those precise and accurate groups, but the numbers will always revert to their mean average, and you will have those unexplained shots.

Achieving and maintaining a 10-fps variation in muzzle velocity on your load is achievable. Loading straight out of a box of premium projectiles with basic sorting techniques will improve precision, but won't keep you in the V/6 ring.

With a 10-fps variation in muzzle velocity and zero (0) variation in BC, your vertical spread without any other influence will be 1.98” with a 308 doing 3000 fps (2995-3005), well within the 10” 1 MOA Centre. At 1000 yards

Introduce 3-6% BC variation from batch to batch in ES from a box of premium projectiles; with normal batching, you might shave off 1-2% (ES) at best. e.g., pointing increases BC, but does not address BC conformity; measuring for length brings stability into conformity and does not address BC; weighing projectiles only addresses a minor percentage at best when it comes to BC conformity

With a remaining 5% ES on your projectiles added to your velocity ES, when you get the extreme spreads in both the velocity and the ballistic coefficient align and don’t cancel each other out, you will have a vertical spread of 11” inches and circa 68fps velocity spread at 1000 yards, which is well outside the V/X ring. This is before you add any shooter or atmospheric inputs.

The test shown below has been conducted on multiple occasions, with similar results. The added dispersion is most likely due to equipment, shooter, and environmental inputs.

Target A was shot early morning, still conditions, projectiles rejected from a batch of 1000 premium-grade projectiles; on average, 1 in 10 do not make the cut to go into sub-batches.

Target B was shot using projectiles batched within one (1) deviation of each other, with no runout. With a crosswind component.

What would you rather be competing with?

"What's One Point Worth?" Just ask the winners

The Model-24

When low BC variation makes all the difference.

Effectively reducing group size, improving a rifle's capability, vastly increasing the confidence that each round will impact where aimed, given the inputs dialled in and adjusted accordingly.

The Model-24 is not another piece of reloading equipment; it’s a test instrument on another level in precision.

"What's One Point Worth?" Ask the winners.

Worth their weight in gold and costing a fine penny new, quality does not fade with time, these are built with precision, like a fine timepiece. Designed to last a lifetime, priceless and made to withstand the test of time.

If you have one of the following and need them serviced or repaired, don't hesitate to get in touch.

Juenke Comparator
Centra Iris
Gehmann Iris
Centra Rear and front micrometer sights

[email protected]

Ready to ship out to another customer, this one is staying in Australia.

No matter how good your hold and wind call, your shot will print outside your rifle's grouping capacity when the extremes of BC and Velocity coincide away from the mean point of either.

A fast, effective way to increase precision and greatly reduce fliers is to spin.

Customers around the world are notching up wins at long range; fantastic to see.

"What's One Point Worth?" that 2% edge

Three years, and ready for the next. How time flies!

We would like to thank all our customers worldwide, from England, the United States, New Zealand, and across Australia, for your custom.

Congratulations on your success.

May your aim be true, and the winds kind.

Shoot far, shoot tight.

Why does the extreme spread in velocity at the target matter.

If you want to step up to the next level, you cannot keep doing what you have always done and expect change.

Your extreme spread in ballistic coefficient (BC) out of the box on premium high-end projectiles will be running around 3-5%, varying on brand, which is anywhere up to 10 inches on target at 1000 yards if muzzle velocity (MV) had zero (0) extreme spread in a perfect world, generic calibre and weight travelling at 3000 fps.

Now add an extreme spread of even 10 fps in MV (a very good figure to have, and most strive for). Will give a variation of, say, an additional 3 inches vertical at 1000 yards; this is where the lucky dip starts, depending on the mix of MV and BC spread in your rounds, either cancelling or adding to vertical dispersion. Now a shot can print somewhere between zero (0) and thirteen and a half (13) inches away from its batch mate, depending on the roll of the dice; that’s plus or minus 6.5 inches added to the overall dispersion of the rifle and ammunition.

In the real world, these numbers translate to an average of 1 in 20 shots printing well outside your grouping capability.

Not only is the extreme spread in muzzle velocity critical at the rifle, as critical is the extreme spread at the target, and that is determined by conformity in the ballistic shape of each projectile, which is driven by BC spread and in turn drives the 10 inches vertical dispersion as an example.

Pointing projectiles will increase BC (in theory if you achieve the correct nose profile), measuring them for length will improve variation in stability, and measuring for weight will shave off 1% in variation at best in BC, but there is a sure way to improve conformity in BC, and it will reduce muzzle velocity spread, and that is the Model-24.

And we have not even mentioned rejected projectiles within a batch that escaped factory quality control.

Follow the numbers. The numbers show the way.

"What's One Point Worth?" just ask the winners.

Dialling in precision at its finest, with the winning edge right at your fingertips.

“What’s one point worth?”

Model-24

Spinning effectively increases precision and improves accuracy.

Low Extreme Spread (ES) in velocity at the muzzle is essentially, but it is only half the challenge; the other critical half is on the journey to the target!!

Simply sorting by length and pointing won't cut it, which only marginally reduces the extreme spread in ballistic coefficient (BC) across the batch of rounds you have meticulously prepared.

Spinning projectiles for concentricity has been well known among champions and the leading shooters in the precision bench rest and rifle fraternity for decades.

It is fast and effective in reducing your down-range muzzle velocity ES, which directly impacts vertical and lateral spread.

Spinning rounds for concentricity is easy with the right gear, it starts by placing a reference projectile that was selected and indicative of the mean shape within a lot of projectiles, with no run out or anomalies onto the cradle of the Model-24, setting the stop so that the boat tail is supported midway, and the ogive is supported along its curve, all one needs to do is dial in the shape via the precision micrometre multi-turn dials to a known reference point, 20 on the dial is a great point as the zero is a easy to remember marker on the 20.

With the reference projectile suitably marked and placed aside. Now, every projectile placed on the cradle can be compared to the reference projectile and sorted by shape into batches.

Projectiles with the same reading and run true, batched into a string, are critical to precision at 700, 900 and 1000 yards,

Any out-of-round, inconsistent shape, or anomalies are indicated by a fluctuating and/or deflected needle. Projectiles with differing shapes and any concentricity issues will have a different drag component, which will affect retained muzzle velocities and open groups as they track downrange.

It goes without saying that in bench rest, the highest quality projectiles should be used in any match at any range where group size counts. Target rifle and scope class are more generous at close range and where targets and BC effects do not play a substantial role, targets with a larger scoring area, such as 800, projectiles with minor inconsistency in concentricity can be used in practice or general range work, such as sighting in.

"What's One Point Worth?" Just ask the winners.

Model-24 comparator & concentricity test instrument.

You have done all your homework,
Rifle built and barrelled by the best riflesmith,
Best optics. repeatable and true in movement.
Projectiles, primers, and brass, meticulously selected, prepped, and batched.
Powder, weighed to the kernel after extensive testing.

Now you have sub, half MOA groups with an extreme spread in MV in single digits.

With a ballistic solver to increase your ability to hit close to the X ring and find the centre of your group with minimal rounds to increase accuracy, giving you that edge to win.

What you have missed.

Every projectile is slightly different, even in premium projectiles; every manufacturing process has its bell curve, which is why there can be as much as 3%-5% variation in extreme spread in ballistic coefficient.

Projectiles,

* Measuring for length will ensure each round has an identical stability factor.

* Pointing projectiles can increase BC and ensure base-to-tip conformity if done correctly, but you are playing with the aerodynamic profile, which much smarter engineers with unlimited resources and testing have at their fingertips, having balanced shape calibre in a dance to find the best stability in all conditions. Any lateral wind will have varying results and cause stability issues as the projectile comes down through the Mach numbers; that pressure wave moves forward as it gets closer to the transonic region, with some surprising results. Insert (where did that wayward shot come from?), all things being equal, it is also an aerofoil, and you just played with its leading edge.

* Many even weigh each projectile. Why, as once again there is a variation, and the perfectionists will remove this variance as much as humanly possible.

Each point above contributes very little to the variation in ballistic shape of each projectile in relation to any other in a batch, with respect to drag and induced drag to differing amounts of non-concentricity of each projectile on its longitudinal axis.

Your tuned load with muzzle velocity in the single-digit ES realm, printing sub, X ring groups at 100 yards, may have as much as 50fps ES at 1000 yards with a vertical spread of 8”, nearly the height of the V/6 ring, due to variation in ballistic coefficient and variation in additional induced drag due to non-concentricity, this is with the rifle in a machine rest without any external variations included.

Spinning for conformity and concentricity is the most effective way to eliminate as much as possible the variation in the ballistic performance of modern rifle projectiles, missed by every other method.

We still highly recommend refinement on the points mentioned above after spinning, i.e. measuring for length, which addresses other factors that are critical but have little direct impact on identifying variation in drag.

"What's One Point Worth?" It's all in the 1%