8/20/09 HPM

You could swim through the air at last night’s HPM it was so humid! Ugh. We opened up the range early so people could get a little training in if they were so inclined. Both Erik Hoskins and myself gave mid-barrel tuners a try before the match. I was using a “Scott Group Tightener” and Erik was using a “Limb Saver”. Our test groups (for both of us) were a little inconclusive but you could CLEARLY see a change in group size as you moved the tuner along the barrel in 1/2 inch increments, we’re just not sure that the tuner made the groups smaller. Regardless, the tuner did provide us with enough positive feedback to warrant a little more testing. I will say this though, in my case, the tuner did not make a crap lot of ammo shoot better. My “good” lot shot good, and my “bad” lot shot bad.

Anyways, on to the match. Joe Graf, setting yet another personal best for the second week in a row, took third place with a 399-31x. Dan Holmes took second with a 399-33x, and Erik Hoskins won the match with a very nice 400-37x. Complete results are here. Also of note, Fred Beihold shot shot a personal best last night as well.

Erik Hoskins bagged a bambi on the way home from the match. Erik and truck are fine but bambi’s feelings seemed “hurt.”

Bambi-related damage.

Bambi-related damage.

About Dan Holmes

Dan Holmes started shooting competitive smallbore in 1986. During his Junior career, he earned two national junior team titles as well as local and regional wins. After a 10 year year hiatus to attend college and start a family, Dan returned to the sport and has added local, sectional and regional wins to his shooting resume. Dan is a Distinguished Rifleman, National Record Holder, U.S Dewar Team Member, Black Hawk Rifle Club Member, Digby Hand Schützenverein member, and is the founder of pronematch.com. He lives in Massachusetts with his wife and 2 children.
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6 Responses to 8/20/09 HPM

  1. Joe Graf says:

    Was bambi hurt enough that next week's steak dinner will also have some venison on the grill?

  2. @pronematch says:

    It would reduce the cost per person.

  3. Erik Hoskins says:

    No, it just bounced off, hit the pavement, looked up at me with the largest set of eye balls I have ever seen and dashed off into the woods.

  4. Len Remaly says:

    Dan,

    The experiments you and Eric are doing sound like "damper" experiments, vs. tuner experiments. My understanding is that a tuner is a weight that moves up and down the barrel or barrel extension, in an attempt to "find the point where the vibration node" is lowest. The node is basically a double sign wave. In the case of a barrel shooting ammo, the barrel will vibrate with each shot. If the muzzel is moving up and down (far from a node), small changes in vibration can give leave you with the muzzle pointing up on one shot and down at another, giving you a wide group. Apparently there can also be some horizontal movement as well. One can "test ammo at different ammo volicities" to get the same result showing diffetent barrel vibration with different lots of ammo. Some (Paul Gideon) say changing bedding screw torque effects barrel vibration also. He tests each lot of ammo at several "torque levels", since he does not know what the correct torque level is for each lot of ammo.

  5. Len Remaly says:

    The damper should "reduce" the magnitude of the vibration, so if you test some ammo with a "large muzzle vibration", the damper should give you a smaller group. If you test a lot of ammo that gives little to no muzzle vibration, there should be NO IMPROVEMENT. Once, you somehow, find ammo and a tuner setting with the minimum barrel vibration, you still need consistant ammo of course. It is possible to have ammo with an average velocity and barrel vibration that is optimum, but the bullet weight, powder charge, primer weight, bullet crimp force, etc varies.
    My conclusion from "tuner, damper and ammo lot testing theory" is that when you somehow find a lot of ammo that shoots a very small group, you have been successful, and people have found good lots of ammo using many different methods.

  6. @pronematch says:

    Len, thanks for the comment, some good information. The tuner I am using is both weight AND dampener so it is perhaps a combination of the two. Erik's is more of a dampener as it made entirely of rubber and does not have a whole lot of heft to it. I too have done some torque testing and had some success.

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