hyskore.com - Hyskore Professional Shooting Accessories | Just another WordPress site

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Title:

Hyskore Professional Shooting Accessories | Just another WordPress site
Age:

13 years old
Alexa Rank:

4,362,730
Total Sites Linking In (Alexa):

38
Domain's IP Country:

United States
Status Code:

OK
IP Address:

69.195.124.231
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hyskore.com Whois Information:

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Domain Name:

hyskore.com
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Domain Age:

13 years old
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Name Server 1:

ns1.bluehost.com
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Name Server 2:

ns2.bluehost.com
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Created:

Thursday 30. October 2003
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Expires:

Friday 30. October 2020
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Domain Registrar:

Network Solutions, LLC.

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Bolt action sporting rifles are by nature and design typically more accurate than pump, lever, or semi-automatic rifles. The reason for this is the bolt action tends to be much more rigid, and therefore flexes less. In addition, a bolt action rifle usually has a larger and stronger extraction mechanism, which means the chamber can be made to closer tolerances than other types of actions. Believe it or not, not all ammunition in the same caliber is made to the exact same dimensions by all manufacturers. For example, SAAMI (Sporting Arms and ammunition Manufacturers Institute, www.saami.org publication ANSI/SAAMI Z299-1992) allows a variance of up to -.008 under the standard for diameter, and up to -.007 under for the standard distance from the base to the shoulder (this determines head spacing) for center fire 30-06 ammunition. (Variances across most calibers are similar.) The extraction mechanism in pump, lever, and especially in semi-automatic weapons must be able to consistently and effectively extract cartridge cases at a rate equal to the cyclic rate of the weapon using the entire range of commercially available ammunition. This can be problematic if the cartridge fits too tight in the chamber. As a result manufacturers tend to make these chambers more tolerant of ammunition that may tend towards the larger end of the size range. Conversely, if ammunition manufacturers want their product to function in guns typically in the hands of sportsmen, they must also consider how easily the cartridge seats and extracts. Needless to say, there are exceptions to this, but as a rule as you move away from a precise cartridge chamber fit accuracy suffers. This is especially apparent in military weapons because they must chamber ammunition from various sources (therefore with various tolerances) and must function even if the ammunition is corroded or dirty. Reliability, not pinpoint accuracy is the primary criteria.
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Match the correct bullet weight to the twist of the rifling. This is one of the most commonly overlooked factors that determines group size. If the bullet length and twist rate of the barrel are not synchronized, accuracy will suffer. A 110 grain .308 bullet is, of necessity, shorter than a 220 grain .308 bullet. For proper stabilization the heavier, and hence longer bullet, requires a faster rate of rifling twist than a short, light bullet. Further to this point, different guns respond differently to ammunition from different manufacturers. The point here is that you should test fire ammunition from several manufacturers and select bullet weights that are compatible with the rate of twist of the gunâs rifling. Generally speaking, twist rate is stamped on the barrel or the information is available from the manufacturer. You need to test different bullet weights to optimize results. The following websites will give you more information regarding this issue:
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As with a center fire cartridge there is a SAAMI specification (ANSI/SAAMI Z 299.1-1992) and variance for the dimensional aspects of rim fire ammunition that allows up to -.004 under the standard diameter for .22 long rifle match or sporting ammunition. Consequently, manufacturers make ammunition within the entire range of this variance. As a direct result a rifle that is expected to perform reliably must be able to accept the full range of available ammunition. What this has led to are guns that are match chambered which are invariably bolt action. (The chambers in these guns have a tight precise cartridge fit and the guns perform best with match grade ammunition that is made to close tolerance), and then we have most other guns that have sporting chambers, many of which are auto loaders. The chambers in these guns must be made large enough so that the gun will cycle correctly with any off the shelf brand of ammunition which could be manufactured to any size within the allowable range of tolerance. i.e., This means the cartridge may fit loosely in the chamber. Due to gravity the cartridge settles into the lowest portion of the chamber. The result is that the center axis of the chamber, and hence the center axis of the barrel is not aligned with the center axis of the bullet. This means that the bullet will engage the rifling off center and will travel down the barrel and exit the muzzle at an angle resulting in a loss of stability and accuracy.
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Concentricity â If the long axis of the bullet is not concentric with the long axis of the case it will also not be concentric with the long axis of the bore, as above the bullet will travel down the barrel and exit the muzzle at an angle with similar results. As little as .002â-.003â off center will cause a noticeable enlargement of the grouping.
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Head Spacing is the distance the bullet must move from the casing until it engages the rifling. In a rim fire this is controlled by the thickness of the rim. According to SAAMI standards rim thicknesses may vary from as little as .036â to as much as .043â. A gun may perform much better with one rim thickness as opposed to others. It therefore important to test your gun with a wide range of ammunition. Typically in a box of inexpensive ammu- nition is you will find a considerable variance in rim thicknesses. This will usually result in expanding the group size; consistency of rim thickness will result in smaller, consistent group sizes. Both concentricity and rim thickness can be measured by using the HYSKOREÂ® #30075 Ammo Analyzer.
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If the group spread is more vertical than horizontal it is usually the fault of the ammunition. At a known distance, a faster bullet reaches the target quicker and drops less, i.e. gravity has less time to act. As you may appreciate, the small quantities of primer and propellant used in a rim fire cartridge must be precisely and accurately measured in order to produce consistent velocity. Only a small variance in absolute terms translates to a significant percentage variation and by extension, variation in velocity. Maintaining this type of consistency across large production runs is incompatible with maintaining low cost. Primer compound has an explosive force in the magnitude of 25 to 50 times that of the propellant. As little as 1/10 grain (1/70,000 lb.) deviation will cause a velocity differential. With these thoughts in mind, the culprit in groups that open top to bottom is almost always inconsistent velocity. The faster bullets strike higher and the slower ones lower.
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Scope Problems â See âFâ and âGâ under Center Fire.
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The easy way â go to one of the rifle recoil calculation websites listed in this pamphlet or go to one of the links listed on our website: www.hyskore.com
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If you like playing with numbers, use the following formula. While Isaac Newton or Albert Einstein might take us to task for being off by 2 or 3 %, this will get you into the ballpark and give you a very close approximation of rifle recoil. We have divided the process into 2 steps. First, calculate the recoil velocity then use this information to calculate the recoil energy in ft/lbs.
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RV = [(1.75 x PW) + BW] x MV
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Multiply the weight of the powder charge PW x 1.75
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RIFLE RESTS
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HAND GUN RESTS
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MAINTENANCE
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PISTOL RACKS & GUN STORAGE
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ACCESSORIES & REST BAGS
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ELECTRONIC HEARING PROTECTION & SAFETY
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DOWNLOADS
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DISCONTINUED
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Products
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Site Map
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HyskoreÂ®
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hyskore.com IP Information:

1.

Ip Address:

69.195.124.231
2.

Country:

United States
3.

Status Code:

OK
4.

Region Name:

Utah
5.

City Name:

Provo
6.

Zip Code:

84606
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Speed test:

28.9 ms

hyskore.com Alexa Information:

5 Websites linking to hyskore.com:
guns.ru
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