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Benchrest shooting is a sport in which very accurate and precise rifles are shot at paper targets. The rifles ride on a front and rear rest, the rests may or may not be joined, depending on the rules of a particular competition. The rests sit on a table or bench, hence the name "benchrest." The shooter simply sits at the bench, in distinction to other shooting disciplines, where the shooter holds and aims the rifle without the benefit of a rest. The post-Civil War era "double rest" rifles were one early form of "benchrest" rifles. Benchrest shooters are notoriously detail-oriented and constantly trying to further the accuracy potential of the rifle through experimentation. Nearly all benchrest rifles are custom made, and many shooters do their own gunsmithing. Nearly all shooters in centerfire competition handload their ammunition in order to tune it to their rifle. In contrast, handloading ammunition is strictly prohibited by the rules for rimfire benchrest competitions. ==Types of Competition== There are two major trends in competition. One type is group shooting, in which the object is to place five or ten shots on a target as close together as possible. Winning placement in competition is determined by how well each competitor achieves this goal or in other words, how closely the shots are grouped. This is sometimes termed precision competition. The other is score shooting, where a traditional bulls eye type target with scoring rings is used. Winning placement is determined by each shooter's score results. This is sometimes termed accuracy competition. However, in competitions (IBS, NBRSA, and The Original Pennsylvania 1,000 Yard Benchrest Club), the competitor's target is scored for both group size and score. A competitor may only win in one category. If, for example a single competitor has the smallest group and highest score, they will be awarded only a win for the smallest group, the next highest score will be awarded the score win. Additionally, there is growing interest in both rimfire and airgun benchrest. Currently, both of these competitions are of the score format only. Benchrest shooters attempt to achieve the ultimate in rifle precision; records for single , 10 shot groups are as small as , the record for a single 5-shot group is (there are no 10-shot competitions at 600 yards), while 10 shot groups are around , and 10 shot groups are around . Five shot groups are significantly smaller.〔cite web |url=http://www.pa1000yard.com〕〔cite web|url=http://internationalbenchrest.com/records/long_range/index.php〕〔(IBS group records )〕〔(IBS score records )〕〔(IBS long range records )〕 Groups are measured from center-to-center, thus negating the variations of different calibers. To accomplish this, the group is measured across its overall widest dispersion, then the diameter of the bullet is subtracted for the result. For example, a group measuring is scored (.375"-.243") for a 6 mm (.243") bullet.〔Official Rule Book, p. 26〕 Matches are shot from with rimfire rifles, up to for centerfire rifles. In competitive group shooting at , shots often land very close together making only one ragged hole in the target, therefore a method for verifying the required number of shots (5 or 10) is used. This consists of a motorized single roll of paper stretched across and moving behind the targets which will record the number of bullets passing through each target. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「benchrest shooting」の詳細全文を読む スポンサード リンク
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