Using a Bramley Barrel Tuner for load development 

What was the range on this?

Same basic concept except we aren't allowed to use muzzle brakes in F Class so I don't have any. There are tuners out there that use set screws, lock washers, friction washers and o-rings and they each work respectably well for how they're designed. I totally get what you're saying but it's not practical in f class 1)becuase we don't have muzzle brakes and 2) if you find yourself needing to make a tuner change quickly it's not practical but I appreciate where you're coming from and in other disciplines it probably works great.

Glad you found it helpful.

I don't know for sure but it's an interesting theory. Maybe I can try to address it later. Thank you.

.....as if there isn't enough variables right,....then add a tuner to adjust everytime variables change harmonics.....lol

When a gun is fired the barrel reacts by moving in an elliptical motion while the bullet is travelling down it, it stops at the very top and the bottom of the motion before changing directions like a ball thrown straight up will stop just before it starts back down. The goal of the tuner is to time the bullet exit at the top or bottom of the harmonic when the barrel hesitates before moving in the opposite direction, no question you will get better accuracy if the bullet is exiting a stationary barrel. Barrel harmonics can change depending on the ammo shot thru it so a tuner adjusted for one load probably won't be perfect for another load and a load and barrel that causes more severe harmonics will benefit more from a tuner. The only barrels that won't benefit from a tuner would be one cut exactly correct so the bullet exits at the top or bottom of the harmonics, pretty rare, but the difference a tuner makes can be difficult to prove depending on how consistent the rifle and ammo are along with the test set up.

@@CCW1911 Actually, no, the goal of a tuner is to have the bullet exiting while the barrel is swinging upwards at a rate that will be helpful the target distance you're shooting. If you have a completely stopped barrel then you will have vertical that directly corresponds to the velocity difference from shot to shot. This is obviously undesirable. What you want is the barrel swinging upwards just fast enough to compensate for the shot-to-shot velocity differences such that a shot that is 2690 fps will be leaving at a slightly steeper angle than a 2700 fps shot. You want that change in departure angle to be enough to compensate for the difference in elevation so that a 2690 fps shot and a 2700 fps shot both hit the same spot on the target. This is impossible if you have a barrel pointing at precisely the same angle for both shots. A 2690 fps shot and a 2700 fps shot that both come from a mythical completely static barrel that never moves will hit the target at different elevations. They must, for their velocities differ. If, however, your barrel is swinging upwards while both shots leave then the 2700 fps shot will be at a slightly lower angle of departure than the 2690 fps shot because the faster one spends less time in the barrel than the slower one. So the faster shot has a slightly lower angle of departure and the slower shot has a slightly higher angle of departure. Since the slower shot MUST leave at a slightly higher angle in order to hit the same spot this upwards swing is obviously desirable. The trick is to fine-tune how slowly/quickly the barrel is swinging so that it helps the 2690 fps shots and 2700 fps shots leave at the angles required to hit the same spot. Any ballistic calculator will show you how much vertical you will be talking about with a 2690 fps shot and a 2700 fps shot at any given target distance. The 1000 yards that get used in F-Class are quite sufficient to show a rather large difference in elevation from just a 10 fps difference. If the ballistic calculator is detailed enough in the results it shows you then you will also be able to determine how much of a difference in departure angle would be present between a 2690 fps shot and a 2700 fps shot. This should allow you to calculate how fast the barrel needs to be swinging in order to give you the required difference in departure angle, though this figure is ultimately not very important as you can't easily reach this desired rate simply because you know the desired rate. It takes some trial and error in figuring out the barrel contour that is too fast, and then how heavy of a tuner you need to slow that "too fast" down to "just right."

Yep for sure! Thank you.

Glad you enjoyed it. Thank you.

Yep, I wouldn't even know about F-class John if not seeing him on the Cortina channel so this seems wrong, I don't believe you can beat the EC and you can have a comp with it too.

In all fairness I'm pretty sure Dan Bramley came out first.

@@wilfdarr Erik has been making tuners for about 8 years. Dan’s are more recent than that.

@@FClassJohn Oh really? Is tand corrected! I only heard about them the last couple years. My bad.

It sure can't hurt. If you need a brake too then check out the Cortina tuner brake www.shootsmallgroups.com/product/ec-tuner-brake-ss-5-8-24-thread/

Typically I do all of my testing at zero and only go out words from there. Too many variables when you have the ability to go up and down.

@@FClassJohn So starting at zero, you tune the ammo, then find the antinodes in the tuner last?

Tuners are definitely allowed (but not brakes). Eric Cortina makes a full line of tuners and tuner brakes as well (that's who I was talking about).

You are joking right? Eric Cortina has an amazing F- Class channel: if you're serious and you don't know who that is, you are really missing out.

I do the best I can with the ads but a lot is out of my control. I have the setting as minimal as I can so it's RU-vid deciding what to do at that point. You can always join my Patreon for even more detailed videos and zero ads.

Ya for some reason I got a lot of ads on this one too (feels like more than normal). I'm not complaining (advertisers supporting firearms content, I'll never complain!), I'm getting this content for free, I'd do the Patreon thing if I could, but ya, if you didn't mean to have this many ads maybe check the settings.

I did not get one? Must be whacked U Tube getting worse?