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> Precision long range hunting and shooting
> Horizontal Stringing
Horizontal Stringing
@ 07:48 am (GMT) |
deerndingoHi,I have been very slowly working on a project rifle and have taken it to the range today and had "interesting" results. Apart from the two or three poorly loaded performers giving outlier lateral movement, the rest had horizontal stringing. So I judge the groupings to give an average - Horizontal = 2.5". Lateral = 0.4". The rifle: 7mm RemMag, Rem 700 SPS, 26" barrel, Bell & Carlson Alpine stock, Load: Sako case, CCI magnum primer, 68.5grain Reloader 22, 162gr SST, 20thou jump. I'm thinking its technique. I can pull groups well under .05" with my 22-250. But an increase in oomph of the 7mm RM and lower weight of the rifle may just be my test. I look forward to hearing opinions on cause and suggestions on solutions. Thank you |
Replies
@ 04:04 pm (GMT) |
Nathan FosterRe: Horizontal StringingHi deerndingo, it may pay to do the old "phone a friend". Perhaps email me to arrange a time that will suit us both.For other readers- this could be either the rifle of the shooter. I have seen the SPS group this way before. The rifle in book 3, pictured on the last page of part 1 produced similar groups during the preliminary accurizing process. |
@ 10:51 am (GMT) |
Timothy KnightRe: Horizontal StringingI have the same thing Nathan but it is a little worse; 3" or more. The first shot from a cold barrel always hits dead on. The second and third start stringing right. I have checked the barrel over and over when it heats up but is not touching anywhere.Rem 700 ADL Blueprinted action Trigger at 3 lbs. Pillar and glass bedded in Remington walnut stock Shilen 1:8" barrel crowned at 24" - #4 Contour Chambered in .260 Rem Tried 140 gr A-Max and 140 Partitions at various loads with H414 and W760. Right after the build the barrel would copper foul terribly after just one shot. Finally had to use Tubbs to stop that. It strung shots horizontally from day one. The rifle shot fairly well in it's .308 configuration with a Krieger barrel. Well known gunsmith restocked, bedded (full length to beginning of barrel taper) and rebarreled and this is the result. Right after he finished the work I moved across the country and unable to take it back to him to figure out. What I have tried: Opened up barrel inlet to assure it did not touch Removed and checked bedding to assure magazine was not in bind changed scope and mounts conducted bedding test (loosen screw and check for movement of gun in stock). I wouldn't think that the action is a bind being a Remington round bottomed action. The only other thing I see is that the pillars seem to be a little proud of the bedding (almost as if the bedding shrunk after drying). I don't know this for sure but it seems so. I am a 3/4 MOA shooter (no better) with the best of gun and ammo (except with my BLR ;<) ) Something is going on here I have never experienced before. How probable is it that the barrel has stress problems? Should I try anything else before I have the barrel removed and sent back to Shilen for inspection? Should I bring the pillars down below the bedding? Thanks, Tim |
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@ 04:29 pm (GMT) |
Nathan FosterRe: Horizontal StringingHi Tim, you might have to take the pillars down. Also check to make sure the front, bottom and sides of the lug bedding are relieved, especially if shrinkage has occured.Make sure the mag box is not pinched. Try a group and see how you go. Try fire lapping one more time- but usemy book 3 as a guide. If she still won't shoot- stop there. Definitely a dud. |
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@ 10:39 pm (GMT) |
Timothy KnightRe: Horizontal StringingWill do. And I'll report back right here. |
@ 02:27 pm (GMT) |
Jim MoseleyRe: Horizontal StringingHad that to happen to me once. Turned out to be the front screw of the front base was to long and it was touching the barrel. Shortened the screw and things were fine. |
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@ 07:13 pm (GMT) |
Timothy KnightRe: Horizontal StringingI promised I would get back to you on progress. Well, I had already relieved the front of the recoil lug some before. So this time I worked on it a little more, but mainly I relieved the SIDES of the recoil lug. I had never touched that before. As I worked on it I noticed there was the slightest ridge of bedding material both in front of and behind the lug above the recess. So, I smoothed that up. Then peeled away a very slight amount of material in the side groves all the way to the bottom with a super sharp-scarey sharp, narrow chisel. Took very little effort to cut away a thin film of material. Then I had to set it aside for a few weeks until the weather cooperated.Since I have explained this much, there is no way to make the story shorter. But I will get to the results. This is ALL I have to do to this gun. I just came in from shooting two 3-hole groups with holes touching, and one at 6/8". No more stringing, no more 2.5" groups. I am a happy camper. It is hard to believe that being unable to return to battery would make this much difference. I am a believer now. Thank you Nathan. Tim |
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@ 09:43 pm (GMT) |
Nathan FosterRe: Horizontal StringingWell that actually made my day. Thanks for sharing Tim. |
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