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Rifles, Reloading, Optics, Equipment
7mm STW
Adding a brake
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<blockquote data-quote="budlight" data-source="post: 1033750" data-attributes="member: 2939"><p>Not all brakes are the same. The best brakes have a ratio of top vents to side vents and they are machined to a very close diameter to the bullet. Darrel Holland and a few others spent the time and determined how many thousands of an inch clearance you need to not disturb the flight of the bullet.</p><p></p><p>My .284 diameter brake has a inner diameter of .287 and the first top vent is before the first large side vents and also angled back at 20 degrees. They are drillable to adjust gun rise. The best are SS. It takes a good machinist to make them indexed without a crush washer. .284 to .287 is only .002 clearance some people drill to more like .010. I don't have scientific data.......... it is just what I did</p><p></p><p>I have brakes on my 7stw, 30-378, 243's and Ar's I've done same day bench rest and they don't change POI if well tuned. I can't say that out of the box because I spent time machining the inner diameter caliber and top vent diameter. hearing protection is a must<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="budlight, post: 1033750, member: 2939"] Not all brakes are the same. The best brakes have a ratio of top vents to side vents and they are machined to a very close diameter to the bullet. Darrel Holland and a few others spent the time and determined how many thousands of an inch clearance you need to not disturb the flight of the bullet. My .284 diameter brake has a inner diameter of .287 and the first top vent is before the first large side vents and also angled back at 20 degrees. They are drillable to adjust gun rise. The best are SS. It takes a good machinist to make them indexed without a crush washer. .284 to .287 is only .002 clearance some people drill to more like .010. I don't have scientific data.......... it is just what I did I have brakes on my 7stw, 30-378, 243's and Ar's I've done same day bench rest and they don't change POI if well tuned. I can't say that out of the box because I spent time machining the inner diameter caliber and top vent diameter. hearing protection is a must:) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
7mm STW
Adding a brake
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