Visit the SWFA.com site to check out our current specials. |
Help! Inconsistent spread on targets |
Post Reply |
Author | |
garyalarson
Optics Apprentice Joined: June/04/2013 Location: Charlotte, NC Status: Offline Points: 184 |
Post Options
Thanks(0)
Posted: June/08/2013 at 22:10 |
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) |
|
Urimaginaryfrnd
MODERATOR Resident Redneck Joined: June/20/2005 Location: Iowa Status: Offline Points: 14964 |
Post Options
Thanks(0)
|
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.
|
|
"Always do the right thing, just because it is the right thing to do". Bobby Paul Doherty Texas Ranger |
|
garyalarson
Optics Apprentice Joined: June/04/2013 Location: Charlotte, NC Status: Offline Points: 184 |
Post Options
Thanks(0)
|
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
|
|
tejas
Optics Journeyman Joined: March/08/2010 Location: Lone Star State Status: Offline Points: 575 |
Post Options
Thanks(0)
|
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.
|
|
M7025-06
Optics Apprentice Joined: January/21/2010 Location: Nebraska Status: Offline Points: 271 |
Post Options
Thanks(0)
|
Like the other guys said...your barrel is probably getting too hot. Slow down your groups and you should be ok.
|
|
garyalarson
Optics Apprentice Joined: June/04/2013 Location: Charlotte, NC Status: Offline Points: 184 |
Post Options
Thanks(0)
|
You guys are awesome. Thanks!!
|
|
Post Reply | |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |