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Help! Inconsistent spread on targets

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/08/2013 at 22:10
garyalarson View Drop Down
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Hope you guys can help me understand what's going wrong here. I shoot a Remington 700 SPS Varmint, 26" heavy barrel. I have created a couple loads that shoot great (sub-moa) at 100 yards for the first several shots then start spreading out. The spread is mostly vertical going up about 2 min and down about the same.

I bore snaked the rifle at the range and cleaned it out. Then fired a tight group of 6 shots. Several shots later the spread started again.

Wonder if its something I'm doing in my reloads as I haven't seen this in factory loads. Could it be my barrel is getting too hot (pretty hot to the touch after 10 rounds). Could it be some goo that builds up in the barrel? How many rounds is too many through a barrel in one sitting.

Open to all thoughts.
(Today's load was 168 Sierra Matchking BTHP, 39.2gr of IMR 3031, Remington Large Rifle primers, PPU Brass, OAL 2.800, est. velocity 2,600)
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/08/2013 at 22:47
Urimaginaryfrnd View Drop Down
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Im thinking it is caused by the barrel heating up.  Is the barrel free floated and glass bedded?  How heavy is the profile of the barrel a heavy profile usually is more consistent where the light profiles are light to carry good for a few shots heat up and may have a decrease in accuracy.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/08/2013 at 22:57
garyalarson View Drop Down
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It is not free floated or glass bedded. That is on my to-do list next time I visit my gunsmith. Here is the Remington page on my rifle. http://www.remington.com/en/products/firearms/centerfire/model-700/model-700-sps-varmint.aspx
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/09/2013 at 09:29
tejas View Drop Down
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Fire a five shot group, let your barrel cool down, then fire another five shot group. If both are good, its just your barrel heating up. Also, keep your ammo in the shade, some powders are sensitive to heat and will have increased pressure if they are hot.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/09/2013 at 09:51
M7025-06 View Drop Down
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Like the other guys said...your barrel is probably getting too hot.  Slow down your groups and you should be ok.    



Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/09/2013 at 19:55
garyalarson View Drop Down
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You guys are awesome. Thanks!!    
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