View Full Version : What is tune?

B. Harvey
10-07-2009, 08:48 AM
This question is for rimfire shooters who actively engage in competition.

Let me start by mentioning a few things I have encountered, then I will pose the questions.

If you have a rifle/ammo/tune combo that gives nice round groups, you would then have vertical in your groups.

I have one tune that gives round groups, and is less sensitive in minor wind changes.

If you have a rifle/ammo/tune combo that has no vertical, and groups are always flat, then obviously, you have no vertical.

I have another tune that has no vertical, has less vertical dispersion due to changing winds, but has more windage for small speed changes.

It would seem logical to me, that a tuned combo will give less vertical, but it also seems logical to expect a round group.

It also seems logical to get less windage with a tuned rifle, you know, bullet flies straighter with less yaw, pushing less air, and so on.

Now, on the tune that gives no vertical, the bullet holes are much crisper with not one funny looking hole in the paper. This would seem to suggest that the bullets are staying true to the target. The round group tune setting gives a little vertical, less windage and the holes are of wide variety. Some crisp and large (wadcutter style) and some very small hole that are ragged.

So far, I have not found an in between setting that combines the best of both tunes.

So, what do YOU call tune?

10-07-2009, 11:06 AM
I dont think you will get the answer you want on this forum if you will call bob collins he will help you I ask for help here when i frist started and BOB TOLD ME HOW TO TUNE AND IT WORKS there is no prefect tune. temp barm altude all plays a part in it . Even the scope play s into it it takes two ammo lot for me . My guns are tuned for the lots that I shoot and they will shoot slow ammo are fast with in two clicks

10-07-2009, 08:39 PM
B. Harvey,
I've seen this in my own rifle. At my home range we do not shoot 5 minute warm-ups before a match. I've done it many times at other matches at other ranges. It allows me to see the vertical dispersion of a particular ammo on a given day. But ammo does indeed shoot differently day to day and month to month and year to year. Just save some of your best from one year to the next and compare how it competes. But most importantly I've seen vertical with ammo that showed none in tuning on one day and enough to not use it in competition on another.


10-08-2009, 08:32 AM
Ask Harry Dennen how often he changes his tuner.After the gun is tuned leave it be. Martin pretty well has it figured out everyone is jumping up and down but it seems to me he has figured a lot of this out on his own.I know of several top shooters that never change a tuner setting after it is tuned right.The best year I had shooting I shot like 13 different lot numbers of lapua because work was slow and I couldnt afford to buy a case at a time and yes I was shooting a factory barrel 40x and yes I did shoot at calffeville with good results. I know I dont shoot anymore but I did learn a little when I did.
Hold center Jerry

Rich In Kansas
10-08-2009, 08:55 AM
This adjusting the tuner thing I believe is rifle specific. I've seen too many shooters I believe say they never adjust their tuner and a good many who swear by it that I also believe. It has always seemed to me that it is the Eley shooters who adjust more than the Lapua shooters and also switch lots more, although both do. I do know one Lapua shooter from Missouri who always seemed to be adjusting his tuner until once I noticed he was faking it. Personally I wonder what can be accomplished adjusting the tuner in a match where wind is involved (10 mph+ and gusty, switchy). I just don't see how you can detect small changes in a breeze. Switching ammo/tuner usually involves adjusting the scope too. That just gets me confused. If one used a Kestral 4000 or similar and knew that under certain circumstances to use such and such a lot with a certain setting maybe.

Rich In Kansas
10-08-2009, 04:41 PM
I didn't really answer the question. 1. I'm in the small "round" groups with no fliers camp. 2. No unexpected fliers in a match. If a shot is out a bit to 9 oclock one needs to be able to say yea, the wind was a bit more (less) and I shouldn't of shot or should have held off or the wind switched as I shot. But if you get shots that go unexpected directions maybe you should reexamine your tune, but not at a match unless you already have another sweetspot to try from previous testing. That's my story. Rich