230 rounds later, Harrel Tuner is now Tuned!

[alamo_308]

After 20 sequential increments, starting with five clicks and tightening down to two, over two days of range sessions, this Vudoo V22S seems to like the sweet spot at setting 188 (between Bulls 17/187 and 18/189), at least with this lot of Lapua Polar Biathlon. The flyer on 17a was all me.
Then I followed up with 25 'proof' rounds on a make-shift ad-hoc target.

 

[Hoser]

Looks friggin awesome.

 

[grauhanen]

Those results look very good.

Do you expect that the setting will be good for other lots?

Do you expect that the setting will be good for all distances?

 

[Hi-NV Shooter]

After 20 sequential increments, starting with five clicks and tightening down to two, over two days of range sessions, this Vudoo V22S seems to like the sweet spot at setting 188 (between Bulls 17/187 and 18/189), at least with this lot of Lapua Polar Biathlon. The flyer on 17a was all me.
Then I followed up with 25 'proof' rounds on a make-shift ad-hoc target.

View attachment 1249616

View attachment 1249618

Question, what is the difference between A & B groups? is it the same setting? on the 189 setting the A group looks pretty good, but if the B group is at the same setting 189 is not the setting you want.
The reason if the B group is at 189 it can't repeat.

Lee

 

[alamo_308]

Those results look very good.

Do you expect that the setting will be good for other lots?

Do you expect that the setting will be good for all distances?

I have no expectations either way. But... I'm about to find out if the setting holds at 100 yards, if the weather here allows me some more range time over the next several days or weeks. Predicting winds to 35mph and intermittent rain the next few days.
I have only the one lot on hand (four bricks; enough to get me through the Texas State Smallbore Championship next month), so any prediction about different lots will have to wait until more Polar Biath comes in stock.

 

[alamo_308]

Question, what is the difference between A & B groups? is it the same setting? on the 189 setting the A group looks pretty good, but if the B group is at the same setting 189 is not the setting you want.
The reason if the B group is at 189 it can't repeat.

Lee

A & B groups are the same setting for their corresponding bull, for example "17th a & b" are same setting. On all groups, the vertical spread is the prime factor, and it seems 189 is at least as good or better than 191 and 193 settings (19th and 20th respectively). The 25 rounds on the 'proof target' are all with the 188 setting.

 

[Hi-NV Shooter]

A & B groups are the same setting for their corresponding bull, for example "17th a & b" are same setting. On all groups, the vertical spread is the prime factor, and it seems 189 is at least as good or better than 191 and 193 settings (19th and 20th respectively). The 25 rounds on the 'proof target' are all with the 188 setting.

The reason I am saying 189 is not what you want, a setting needs to be repeatable for example
this target was shot with 4 different lots of CX, though they are not exactly the same size I can expect using any of the 4 lots to shoot sub-0.150 ctc 5-shot groups.
I am not sure how big the target you will shoot in competition but if the setting for your tune can shoot multiple lots randomly this is what you want to strive for. as I mentioned the A group at 189 is pretty good, but the concern I see is the B group as it fell apart. now here is something to try from a clean bore re-shoot the 189 setting for at least 4 groups if you can get nearly the same for the 4 groups as the A group then perhaps it may very well be the setting.

Lee

 

[alamo_308]

The reason I am saying 189 is not what you want, a setting needs to be repeatable for example
this target was shot with 4 different lots of CX, though they are not exactly the same size I can expect using any of the 4 lots to shoot sub-0.150 ctc 5-shot groups.
I am not sure how big the target you will shoot in competition but if the setting for your tune can shoot multiple lots randomly this is what you want to strive for. as I mentioned the A group at 189 is pretty good, but the concern I see is the B group as it fell apart. now here is something to try from a clean bore re-shoot the 189 setting for at least 4 groups if you can get nearly the same for the 4 groups as the A group then perhaps it may very well be the setting.

Lee

Totally agree: 189 is not what I want. That's kind of why I did not select it, but went with the 188 setting, which is what was used for the 25-round 'proof' target; two groups of 10 rounds and one group of five rounds.
Interesting to note that the dime coin diameter is exactly .7025-inch, easily covering the 189 b group.
More Polar bricks (different lot) are on the way, so that will be a good comparison as well. Also plan to try some left-over Midas+ and Biathlon Xtreme at this tuner setting, just for grits and shins.