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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need some input on a problem 338 RUM
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<blockquote data-quote="D.Camilleri" data-source="post: 1188508" data-attributes="member: 2567"><p>I am having some issues with my favorite rifle. The rifle in question, custom remington 700, 338 rum, Broughton 5 C, 9.3 twist, jewell trigger, bell and carlson alaskan full pillar bedded stock, picatiny rail, burris tactical rings.</p><p></p><p>I have been having issues with point of impact changes between putting the gun away with a warm bore and cold bore shots. A friend of mine just bought a bore scope, and when we looked at my bore we found it was severely carbon fouled. I spent a good deal of time cleaning and finally got the bore clean. The clean bore looked good. I have shot twice since cleaning the bore and I just can't seem to find my accuracy. My go to loads have been 300 gr berger otm in front of 90 grs of H-1000 seated to magazine length of 3.670. With this load I am .225 off of the lands. In the past it has shot very well. Today, I started with a very clean barrel. My first cold two bore shots were about 5 inches high. The next several shots hit about 3 inches high of the bullseye. I dialed the turret down 3 moa and shot two shots. They hit about 1 inch high of the bullseye and about 1/2 inch apart. I also was shooting some test loads with RL33 and 300 gr accubonds. They were hitting to about the same point of impact as the bergers but on a separtate target. As the barrel warmed up, the shot kept going lower until they settled in about 2 inches low of the bullseye. I shot a total of around 10 shots from each load. The bergers looked like a pattern. The accubonds looked better, with a couple of flyers. </p><p></p><p>I am really scratching my head with this problem. In the past with this barrel, once it got warm it would shoot very tight groups, but poi has always shifted down as the barrel heats up. When shooting through a chronograph, the velocity seems to drop as the barrel warms.</p><p></p><p>My thought is to shoot again with a cold bore without cleaning and see what happens. I just opened up a new lot of bergers and they seem to have a different ogive measurement than my last lot moving the ogive from the lands by an additional .020. My load with the accubonds are about .145 from the lands. I am temped to load some up to about .090 off the lands and test them, but they will have to be single shots. Maybe it is time for a wyatts magazine box so I can seat these out further.</p><p></p><p>Any thoughts?</p></blockquote><p></p>
[QUOTE="D.Camilleri, post: 1188508, member: 2567"] I am having some issues with my favorite rifle. The rifle in question, custom remington 700, 338 rum, Broughton 5 C, 9.3 twist, jewell trigger, bell and carlson alaskan full pillar bedded stock, picatiny rail, burris tactical rings. I have been having issues with point of impact changes between putting the gun away with a warm bore and cold bore shots. A friend of mine just bought a bore scope, and when we looked at my bore we found it was severely carbon fouled. I spent a good deal of time cleaning and finally got the bore clean. The clean bore looked good. I have shot twice since cleaning the bore and I just can't seem to find my accuracy. My go to loads have been 300 gr berger otm in front of 90 grs of H-1000 seated to magazine length of 3.670. With this load I am .225 off of the lands. In the past it has shot very well. Today, I started with a very clean barrel. My first cold two bore shots were about 5 inches high. The next several shots hit about 3 inches high of the bullseye. I dialed the turret down 3 moa and shot two shots. They hit about 1 inch high of the bullseye and about 1/2 inch apart. I also was shooting some test loads with RL33 and 300 gr accubonds. They were hitting to about the same point of impact as the bergers but on a separtate target. As the barrel warmed up, the shot kept going lower until they settled in about 2 inches low of the bullseye. I shot a total of around 10 shots from each load. The bergers looked like a pattern. The accubonds looked better, with a couple of flyers. I am really scratching my head with this problem. In the past with this barrel, once it got warm it would shoot very tight groups, but poi has always shifted down as the barrel heats up. When shooting through a chronograph, the velocity seems to drop as the barrel warms. My thought is to shoot again with a cold bore without cleaning and see what happens. I just opened up a new lot of bergers and they seem to have a different ogive measurement than my last lot moving the ogive from the lands by an additional .020. My load with the accubonds are about .145 from the lands. I am temped to load some up to about .090 off the lands and test them, but they will have to be single shots. Maybe it is time for a wyatts magazine box so I can seat these out further. Any thoughts? [/QUOTE]
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Need some input on a problem 338 RUM
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