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When do you call it good enough
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<blockquote data-quote="MMERSS" data-source="post: 1112841" data-attributes="member: 63748"><p><span style="font-family: 'Verdana'"><span style="font-size: 10px">Echo what Roy is saying. A group is a representation of precision. Precision is repeatability. If the purpose of a rifle/ammo combination is for paper groups such as competition the rifle/ammo precision should be measured for this type of shooting. If the purpose of a rifle/ammo combination is for hunting the precision should additionally be measured for this type of shooting.</span></span></p><p></p><p><span style="font-family: 'Verdana'"><span style="font-size: 10px">Two weeks past a new barrel was installed on a tactical rifle. After load development a 10 shot group was taken at 400 yards from the prone to measure target shooting precision potential. The first cold bore shot landing about .2 MOA low from a later group cluster of 8 of the 10 rounds. The last round in the remaining 10 shot group additionally landed about .2 MOA to the right of the 8 round cluster most notably due to a wind shift. The total measurement including all 10 rounds was .55 MOA. Strike out the first round and the round at 3 o'clock caused by a wind shift and the 8 shot group cluster measured .35 MOA. Either way, .5 or .3 MOA at 400 yards for ten rounds is a good group……….or is it? What is the repeatability intent of the rifle? Target shooting or cold bore first round shooting?</span></span></p><p></p><p><span style="font-family: 'Verdana'"><span style="font-size: 10px">The rifle is intended for cold bore first round shots. As such, this is where the precision potential or repeatability needs to be measured. One shot and one shot only is taken at a time on the 100 yard range to confirm zero and establish cold bore precision potential. The rifle is shot from the prone with support as was on the 400 yard range. All the gear is picked up, the gun is allowed to cool back to ambient temperature, and the rifle is set up again for another single shot. This process is repeated for a minimum of 5 shots. The more single shots taken the more confidence there is in the rifle/ammo precision. Cold bore precision results indicated the rifle is capable of .7 MOA groups that is center offset 1/8 MOA to the left. Is there a notable difference between cold bore grouping and target grouping?</span></span></p><p></p><p><span style="font-family: 'Verdana'"><span style="font-size: 10px">Factor in field rifle/ammo and now shooter precision potential combined with wind and any other uncertainties and an 8 shot .35 MOA 400 yard group won't help much at all in the field without an understanding on how to unite the long range marriage between the elements that form long range accuracy.</span></span></p><p></p><p><span style="font-family: 'Verdana'"><span style="font-size: 10px">If I have no more than .7 MOA cold bore precision I move on. Over time the new barrel may settle increasing cold bore precision potential to a goal of .5 MOA or less. The target precision is there, hopefully the cold bore precision will follow. Until then, time and energy is better utilized with single shot cold bore practice…..not group shooting.</span></span></p></blockquote><p></p>
[QUOTE="MMERSS, post: 1112841, member: 63748"] [FONT=Verdana][SIZE=2]Echo what Roy is saying. A group is a representation of precision. Precision is repeatability. If the purpose of a rifle/ammo combination is for paper groups such as competition the rifle/ammo precision should be measured for this type of shooting. If the purpose of a rifle/ammo combination is for hunting the precision should additionally be measured for this type of shooting.[/SIZE][/FONT] [FONT=Verdana][SIZE=2]Two weeks past a new barrel was installed on a tactical rifle. After load development a 10 shot group was taken at 400 yards from the prone to measure target shooting precision potential. The first cold bore shot landing about .2 MOA low from a later group cluster of 8 of the 10 rounds. The last round in the remaining 10 shot group additionally landed about .2 MOA to the right of the 8 round cluster most notably due to a wind shift. The total measurement including all 10 rounds was .55 MOA. Strike out the first round and the round at 3 o’clock caused by a wind shift and the 8 shot group cluster measured .35 MOA. Either way, .5 or .3 MOA at 400 yards for ten rounds is a good group……….or is it? What is the repeatability intent of the rifle? Target shooting or cold bore first round shooting?[/SIZE][/FONT] [FONT=Verdana][SIZE=2]The rifle is intended for cold bore first round shots. As such, this is where the precision potential or repeatability needs to be measured. One shot and one shot only is taken at a time on the 100 yard range to confirm zero and establish cold bore precision potential. The rifle is shot from the prone with support as was on the 400 yard range. All the gear is picked up, the gun is allowed to cool back to ambient temperature, and the rifle is set up again for another single shot. This process is repeated for a minimum of 5 shots. The more single shots taken the more confidence there is in the rifle/ammo precision. Cold bore precision results indicated the rifle is capable of .7 MOA groups that is center offset 1/8 MOA to the left. Is there a notable difference between cold bore grouping and target grouping?[/SIZE][/FONT] [FONT=Verdana][SIZE=2]Factor in field rifle/ammo and now shooter precision potential combined with wind and any other uncertainties and an 8 shot .35 MOA 400 yard group won’t help much at all in the field without an understanding on how to unite the long range marriage between the elements that form long range accuracy.[/SIZE][/FONT] [FONT=Verdana][SIZE=2]If I have no more than .7 MOA cold bore precision I move on. Over time the new barrel may settle increasing cold bore precision potential to a goal of .5 MOA or less. The target precision is there, hopefully the cold bore precision will follow. Until then, time and energy is better utilized with single shot cold bore practice…..not group shooting.[/SIZE][/FONT] [/QUOTE]
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