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The Basics, Starting Out
Help - grouping question
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<blockquote data-quote="Boss Hoss" data-source="post: 303962" data-attributes="member: 5060"><p>Unless you are getting consistent results over time, then there is a variable in your process somewhere or the rifle is not capable of shooting five shot groups as small as you would like. A common problem with factory tubes and rifles for that matter.</p><p></p><p>How long are you letting the 4th and 5th round sit in the chamber before you are pulling the trigger? When I am competing, the round is only in the chamber maybe 2 seconds so any heat transfer will be kept to a minimum. </p><p></p><p>Bench technique has a large part of being successful at shooting small holes as well and as a factory or some custom tubes heat then stress is introduced which will shift POI and compounded by inconsistency in you bench technique.</p><p></p><p>I have a sporter that by putting excessive torque the front lug will cause a change in POI as the barrel and action heat up. Granted it is a B/P'ed Remington that will shoot .3 if I do my part but put 20 lbs more on that front lug and it went to a garden sprayer shooting right at an inch. The rifle is a 6.5 284 built to the same specs as my match tubes using the same reamer and ammo so the only variable was 20 lbs of TQ.</p><p></p><p>There are so many variables in this equation not knowing how your rifle was built that it is almost impossible to diagnose accurately. Just a FYI but after I started getting Speedy to make all of my dies with the reamers being used for the tubes oh and the seating die is a Wilson that goes into the arbor press my run out problems vanished completely. A very often-overlooked part of the precision loading process is the consistent application of sizing lubricant to the brass. Spring back or the lack thereof on part of the brass when it comes out of the sizing die can account for quite a few problems in and of itself. Hope this is not too much information but when preparing ammunition ANY VARIABLE in the process has, the potential to cause erratic results all other thing being equal.</p></blockquote><p></p>
[QUOTE="Boss Hoss, post: 303962, member: 5060"] Unless you are getting consistent results over time, then there is a variable in your process somewhere or the rifle is not capable of shooting five shot groups as small as you would like. A common problem with factory tubes and rifles for that matter. How long are you letting the 4th and 5th round sit in the chamber before you are pulling the trigger? When I am competing, the round is only in the chamber maybe 2 seconds so any heat transfer will be kept to a minimum. Bench technique has a large part of being successful at shooting small holes as well and as a factory or some custom tubes heat then stress is introduced which will shift POI and compounded by inconsistency in you bench technique. I have a sporter that by putting excessive torque the front lug will cause a change in POI as the barrel and action heat up. Granted it is a B/P’ed Remington that will shoot .3 if I do my part but put 20 lbs more on that front lug and it went to a garden sprayer shooting right at an inch. The rifle is a 6.5 284 built to the same specs as my match tubes using the same reamer and ammo so the only variable was 20 lbs of TQ. There are so many variables in this equation not knowing how your rifle was built that it is almost impossible to diagnose accurately. Just a FYI but after I started getting Speedy to make all of my dies with the reamers being used for the tubes oh and the seating die is a Wilson that goes into the arbor press my run out problems vanished completely. A very often-overlooked part of the precision loading process is the consistent application of sizing lubricant to the brass. Spring back or the lack thereof on part of the brass when it comes out of the sizing die can account for quite a few problems in and of itself. Hope this is not too much information but when preparing ammunition ANY VARIABLE in the process has, the potential to cause erratic results all other thing being equal. [/QUOTE]
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