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ULD's, ES & nitpickin

 
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  #1  
Old 10-03-2007, 10:46 PM
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ULD's, ES & nitpickin

Been doing some shooting, load testing and checking drops lately because of an 11th. hour barrel change courtesy of APS Right off the bat this tube seemed like it was gonna try and get along with me so I've been a little pickier and a little more anal than normal .

This time I tried loads more to the upper and lower extremes and found that I can easily push it to 3400 but the J4s just really really don't like it up in that stratosphere and tend to get a little flaky. so then I went in the other direction. Just like focusing a picture in a camera this thing slowly "came into focus" and at speed a little lower than I'd been shooting with prior tubes but found that I'd finally found a sweet spot and the ES put a smile on my mug.;) I've heard all kinds of comments about group size, ES etc. but I firmly believe that you can't have a super accurate looong range gun with out low ES.

Take your favorite group and load. With the ES of that load, go to your friendly ballistics software and looking at 1000 yards and on out, vary the velocity by the low to high variation you have in your favorite load ES and notice the difference in elevation at the longer ranges. If you factor in the normal variations in group size due to mechanical/steel/human variations then I believe you have an opportunity in ES to help reduce your group sizes at extended ranges. Why not eliminate as many variables as possible?

The load I'm currently running is turning out to be verrry accurate and also seems to help immensely in the vertical dispersement department.

We were out doing some shooting today and set up a target at 811 yards. Winds were pretty steady at 5-8 with gusts to 12-15 from 3:00. I made no allowances for the wind as I knew the horizontal would be exaggerated because of the wind. I was mainly interested in vertical, as I know it's horizontal will match the vertical under ideal conditions, and I was also checking drops for data confirmation.

We were shooting across the top end of a canyon that dumped the winds out of the canyon into our line of fire at about 250-300 yards and the whole range, from where we shot to the target was out in the open and exposed to the winds. Talk about some real world practice. Sure glad I don't live in Wyoming.;)

Except for the called third shot, the group turned out pretty good. A couple of guys driving by stopped at the bench and asked me a few questions after the second shot. I just didn't have my mind where it should have been for the third shot and I knew where it was going when I broke it. You can see what I feel is the result of a very accurate load with an ES in the mid single digits in a case that burns 100 grains + of powder .

If we'd had time to put out wind flags and fully utilize the R2 reticle it might have ended up being a half way descent group. It's done better but this is a good representation of it's potential.;)

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Old 10-04-2007, 07:02 AM
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Nice shootin'

Beautiful!
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Old 10-04-2007, 08:46 AM
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that's some kind of good.

Flaky even in the 5R, eh @ 3400?

What is your velocity?
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Old 10-04-2007, 09:27 AM
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I found similar results in my rifle....30" Lilja 6 groove, 1-9 twist, Nesika M....At 3400fps, accuracy was ok, but not great. At around 3320fps, accuracy was very good and es was low. At 3200, accuracy is also good, but es was a little higher than I like. I am also doing some 11th hour testing. Guess we should have left well enough alone. What velocity are you running her at now?

Good shooting, by the way. Those muley's are in trouble.
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Old 10-04-2007, 10:24 AM
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Roy and TMR:

The velocity of this load is running 3140 fps. I'll take accuracy over top speed any day. I feed her what she likes.;) We seem to get along better that way.

Dialing the clicks is easy so 100 fps really doesn't make much difference.;)
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Old 10-04-2007, 11:37 AM
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Very nice work ss7mm. That round sure has my attention. Have you had any chance to use it on any game yet?
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Old 10-04-2007, 11:50 AM
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Originally Posted by gamedog View Post
Very nice work ss7mm. That round sure has my attention. Have you had any chance to use it on any game yet?
I've killed 3 deer and one elk with it. The longest deer, if I remember correctly was about 860 yards and the elk, again if I remember correctly, was about 690 yards. All one shot kills. None of the bullets for the deer were recovered but the elk was a full body length shot and I recovered the bullet after it went through 4' or more of elk. They were all dead before they hit the ground.;)
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