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Post by xring on Jan 18, 2015 8:05:37 GMT -5
Got the rem-brux out yesterday to get back in grove after scope change. I changed scope from my hunting scope to one that I don't want to beat up. Shot 3 shots with 300gr xtp's to get on paper (making scope adjustments) then went to 200yds with 300gr match parkers. My question is why vertical string? On bags and steady and good trigger squeeze. I"m thinking it could be chamber pressure but why. All powder was weighted to as close as possible. Bullet was lubed and sized consistent. Load pressure where all real close to the same as I would guess 5lbs (2 fingers). Not noticing any blow back and primers not showing any problems. Any comments are diffidently welcome. I"m sure this won"t get any bragging rights at the Kentucky Challenge  .  |
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Post by wilmsmeyer on Jan 18, 2015 8:08:10 GMT -5
It's not a bad group and maybe an anomaly. I would do it again and see if it repeats before making any guesses.
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Post by Deleted on Jan 20, 2015 23:57:15 GMT -5
Did you shoot it over a chronograph? You need to see what your es is and that would tell you the story. Also another thing to think about is have you bedded your scope base (is it a one piece or two piece base) is your rifle pillar bedded and is the action bedded?
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Post by xring on Jan 21, 2015 6:44:35 GMT -5
No chrony and your right I do need to check es. All has been bedded and one piece rail. When I get a chance will shoot over chrony. Good thinking guys. I have seen this ML shoot better. Just kinda surprised when I seen this. The barrel has 52 shots on it and that was another thing I have been experimenting with. Maybe its time for a good cleaning.
Rick
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Post by mrbuck on Jan 21, 2015 10:55:01 GMT -5
May experienced shooters say vertical stringing can be cured with a hotter primer or an increase in the powder charge . Might also drop the powder charge to see what happens .
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Post by rossman40 on Jan 21, 2015 11:05:13 GMT -5
The most common causes of vertical stringing IMO is velocity swings, the shooters form on handling recoil or scope mounting issues. Again these are the most common I've seen. Since this happened after a scope change you could have the scope in a slight bind or mounting issue. Maybe even if when you switched scopes there is a big enough weight difference (say like 10oz+) you could have messed with the harmonics just enough to where your "off the node". I've seen this happen when guys switch from a light scope in the 12-14oz range to a heavier tactical style that is in the 30oz+ range.
It is intersting that it was climbing from the first shot to the third, not erratic/random, like the fouling level is getting where it wants to be or maybe something is settling in (like scope mounting). In the artillery we would call this a "trend". You could have a velocity trend due to barrel or powder temps, maybe even the fouling level, slightly messing with the "curve". Interior ballistics is so much different, or should we say maybe finicky, with a SML compared to centerfire.
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Post by deadeye on Jan 21, 2015 12:01:38 GMT -5
rossman+////may be time to adjust .5gn to see/try 68.5 first then if no better 67.5
for this test if the first 2 are acceptable add the 3rd-if not re-adjust load aka fine-tuning
if not maybe time for a scrub
?-same bag & gun set-up etc-?
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Post by Deleted on Jan 24, 2015 10:38:52 GMT -5
Would smooth forming vs full forming be another reason for vertical stringing? Meaning that full forming having a better and more precise pressure seal causing less vertical stringing?
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Post by 1coyotemaster on Jan 24, 2015 11:23:25 GMT -5
I have had grouping problems due to a bad scope as well--is it a proven scope?
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Post by jaycee on Jan 28, 2015 14:31:38 GMT -5
Vertical stringing when shooting metallic cartridges, is usually a sign of a bedding problem.
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Post by wilmsmeyer on Jan 28, 2015 18:37:18 GMT -5
Validity to all posts. I still say one group, and a good one at that, at 200 yds and you can't call it vertical stringing unless it becomes a pattern. Shoot again and then contemplate the advise and hunches. Maybe next time you get a triangle? or horizontal? One group is never a reason to go fishing....even if you are a great shot. IMHO
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Post by xring on Jan 29, 2015 7:55:17 GMT -5
Very good comments from everyone. The truth of the fact is that I did shoot another group and it got worse. The scope came off to find there was movement between base and rings. All of you that commented on scope problems where right. Down deep I knew that but did not want to admit it. I'm to bullheaded. New base and rings are on the way. Will be back in a few days to post results.
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Post by deadeye on Jan 29, 2015 8:25:56 GMT -5
Very good comments from everyone. The truth of the fact is that I did shoot another group and it got worse. The scope came off to find there was movement between base and rings. All of you that commented on scope problems where right. Down deep I knew that but did not want to admit it. I'm to bullheaded. New base and rings are on the way. Will be back in a few days to post results. steel base I hope!  rick,if time you might post a pic of that alum sheared base. I know rossman had a few pics long time ago for some to view. |
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Post by xring on Jan 29, 2015 13:12:52 GMT -5
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