A little "on the fly "

September 27 2017 at 1:06 PM

Héctor Medina  (Login HectorMedina)
YF


Response to "What Happened to Me" by Josh3rd (long post)

Thanks for all your kind words.

What I wrote is just the results of a few years of careful observations and notes.
I have been blessed with the opportunity to dedicate myself to this full time, until becoming a stay at home Dad, LOL! Thanks should really go to Veronika, that made it all possible.

Anyway, short comments
Boomer is too modest, you should see the looks he gets from waitresses at the Texas Roadhouse in New Philadelphia. wink.gif

Paul is partially right in that rifling rates (twists) can define whether a pellet wobbles in flight or not, but in my experiments, and I am right now in the final stages of a very long research project that has taken over 4 years, there are other aspects that are as important, if not more.
Manolo uses an Anschütz barrel, so quality of manufacturing is a given there, he also specced the internal dimensions of the barrel for a pellet. So when he shoots these pellets, he has good results, but his barrels are not dramatically more "forgiving" of batch differences than others.

We need to remember that wind drift is proportional to pellet's velocity LOSS. And that is a function of drag, which in turn gets its worse boost from wobble.
A pellet that "goes to sleep" (meaning that it's turning in its own axis without any wobble) will drift much less than a pellet that does wobble, even slightly.
In BR and LR circles barrels that are capable of precisely and accurately putting to sleep the projectiles used are called "hummers". And within the realm of cilindroconical bullets, the factors that are conducive to this are rather well known.
Not so in the pellet world.
And there are two reasons for that, sort of like a push-pull toy.
The VASTLY PREDOMINANT twist rate for pellet barrels is in the region of 1/16". Partly inheritance of the old days of using RF barrels for Airguns.
So, most pellet manufacturers strive to obtain the best results out of these typical barrels.
And so, we perpetuate the situation where "natural selection" tends to ensure that the best probability of high accuracy comes from the established twist with the established pellet shapes.
Until recently, that H&N decided to "rescue" the efforts made by the deceased "Defiant/Prometheus" line in what is now called the "Sniper" line, we had not seen an innovative pellet shape since Sheridan's Bantams.

Again it's a question of minimizing the wobbles and given the extremely complex shapes of pellets we are still some time away from final results. But we are advancing.

Josh.- 40 clicks are not magnification dependent. Unless you want to measure the subtension (angle) instead of the distance (inches) between aimpoints before and after the 40 clicks.

If you measure the distance (inches) with a target placed at 95.51 yards, you will be measuring MOA's.
If you measure inches at 100 yards you will be measuring "shooter's MOA" or IPHY's.

PERSONALLY, I would suggest you measure the number of clicks per YOUR dots. As it is this combined number what will be most useful to YOUR method of shooting every distance possible.
It's not what I would do because having made PP-Calc, I tend to rely on it for establishing my numbers for each venue.

HTH


Thanks again, keep well and shoot straight!



HM

 
 Respond to this message   
Responses

On line trajectory calc by Brad Troyer MILDOTS

D I S C L A I M E R

JK's Airgun Forums, moderators, and administrators are not responsible for any problems that may occur from reading or using content posted on this forum, as they are the exclusive responsibility of two parties: the person who posted it and the person who acted on said posted information. Use of our forums by people under 18 years old is allowed only with legal guardian(s) present.

FORUM RULES BELOW

When you signed up you agreed to All N54 Rules. 1-No Flaming or name calling. No personal attacks, racial slurs, foul language, insults or trolling. This is cause for post deletion and/or banning. 2-Instigating with the purpose of drawing people into highly argumentative situations and wasting of bandwidth is cause for post deletion and/or banning. 3-Do NOT comment on Forum Moderation. It is what it is, live with it or leave. This is an immediate 30 day ban. 4-If you feel wronged email eagleaetos@yahoo.com 5- Keep this FT forum civil and behave in a socially acceptable manner. 6- The primary purpose of this FT forum is the discussion of field target; however, the buying and selling of field target gear and rifles is permitted between forum users pursuant to the same rules as the Yellow Classifieds and the user assumes all responsibility for the transaction. Non-sponsoring dealer sales are not allowed. To keep the forum clean of ads and pursuant to the intent of the FT forum, WTB and FS ads are subject to deletion by the forum moderator once they fall off of the first page.