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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Could I be losing 350-400 fps in my rifle vs factory ammo published data
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<blockquote data-quote="JakeL" data-source="post: 1005607" data-attributes="member: 76526"><p>You can usually count on factory ammo to be 5% slower than actual stated velocity. But your BC values are also probably a problem. </p><p></p><p>Federal lists the fusion 150 load for 7mm rem mag at 3050. I would guess actual will be more like 2900-2950 with a 24-26" barrel. (Pure guesstimating). Then they claim a BC of .509 for the bullet, that seems very optimistic to me. The sierra gameking boat tail spitzer bullets usually have about as high of a BC as you can get with a soft nose bullet (like the fusion is). Sierra also has a decent reputation of giving pretty accurate BC values for their bullets. They state that their 7mm 150 gr gameking has a BC of .436. Try inputting a BC for your fusion bullet around .42-.43 and a velocity of 2900-2950 and you should be getting closer.</p><p></p><p>With the hornady round I suspect it's the same deal, velocity is probably about 2950 and the BC is probably more like .500 than .525. </p><p></p><p>Hopefully that helps.</p></blockquote><p></p>
[QUOTE="JakeL, post: 1005607, member: 76526"] You can usually count on factory ammo to be 5% slower than actual stated velocity. But your BC values are also probably a problem. Federal lists the fusion 150 load for 7mm rem mag at 3050. I would guess actual will be more like 2900-2950 with a 24-26" barrel. (Pure guesstimating). Then they claim a BC of .509 for the bullet, that seems very optimistic to me. The sierra gameking boat tail spitzer bullets usually have about as high of a BC as you can get with a soft nose bullet (like the fusion is). Sierra also has a decent reputation of giving pretty accurate BC values for their bullets. They state that their 7mm 150 gr gameking has a BC of .436. Try inputting a BC for your fusion bullet around .42-.43 and a velocity of 2900-2950 and you should be getting closer. With the hornady round I suspect it's the same deal, velocity is probably about 2950 and the BC is probably more like .500 than .525. Hopefully that helps. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Could I be losing 350-400 fps in my rifle vs factory ammo published data
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