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<blockquote data-quote="trebark" data-source="post: 562761" data-attributes="member: 19172"><p>You're right, there is no such thing as being 'under-gunned'. For the 7rum I would expect to get about 1000 rounds from the barrel. As long as you don't shoot long strings of shots, you can probably get more.</p><p> </p><p> </p><p></p><p> </p><p>I like the 280 because of the barrel life (2500+ rounds), it does not have a steep shoulder so it feeds well from the magazine and it can shoot a high BC bullet at 2750fps which carries a ton of energy and low wind-drift way down range. </p><p> </p><p></p><p> </p><p>Although my carry-rifle (280Rem shooting 168VLD at 2750fps) has sufficient energy to kill deer at 1000yards, I am comfortable and confident with it out to ~600. I have an opportunity for some longrange practice coming up. If all goes well, my confidence level may stretch to 800. Longrange is not the primary purpose for this rifle though. Generally I have the gun zeroed at 200 yards and shoot 200 and closer with it.</p><p> </p><p></p><p> </p><p>Couple of things here....</p><p> </p><p>1. You want a rate of twist in your rifle that is fast enough to shoot the heaviest bullet. Lets say for instance in your 7mm you went with a 1:10 rather than 1:9. The 1:10 twist would limit you to shooting 150grain or lighter bullets. What if your rifle doesn't like the 140 and 150 grain bullets? then what? you don't have enough twist to try the 160+ bullets. Whereas if you have 1:9 you can shoot everything.</p><p> </p><p>2. Heavy vs. Light bullets.</p><p>You're partially right that lighter bullets tend to shoot faster and flatter than heavy bullets..to a point. It's all about ballistic-coefficient (BC). BC puts a numberical value to the aerodynamics of a bullet. Generally speaking, heavier bullets have a better BC than lighter bullets. As a result, the heavier bullets will be able to maintain their velocity at longer ranges than the lighter bullets and they will have much less wind drift. (note: the higher the BC, the better)</p><p> </p><p>As an example, use whatever ballistic software you have and compare the trajectory, energy and wind drift of two 7mm bullets...150grain Nosler Ballistic Tip @ 2900fps (BC = .429) vs. 168grain VLD @ 2750fps (BC = .612). You will see that inside 600yards the 150 might have some superiority over the 168, but when you cross 600 yards you will see that the superior BC of the 168 will take over. From 600 to 1000yards, the 168 will be flatter, carry more energy and have less wind drift than the 150. When the range gets loooong, wind drift becomes more of an issue than flat trajectory.</p></blockquote><p></p>
[QUOTE="trebark, post: 562761, member: 19172"] You're right, there is no such thing as being 'under-gunned'. For the 7rum I would expect to get about 1000 rounds from the barrel. As long as you don't shoot long strings of shots, you can probably get more. I like the 280 because of the barrel life (2500+ rounds), it does not have a steep shoulder so it feeds well from the magazine and it can shoot a high BC bullet at 2750fps which carries a ton of energy and low wind-drift way down range. Although my carry-rifle (280Rem shooting 168VLD at 2750fps) has sufficient energy to kill deer at 1000yards, I am comfortable and confident with it out to ~600. I have an opportunity for some longrange practice coming up. If all goes well, my confidence level may stretch to 800. Longrange is not the primary purpose for this rifle though. Generally I have the gun zeroed at 200 yards and shoot 200 and closer with it. Couple of things here.... 1. You want a rate of twist in your rifle that is fast enough to shoot the heaviest bullet. Lets say for instance in your 7mm you went with a 1:10 rather than 1:9. The 1:10 twist would limit you to shooting 150grain or lighter bullets. What if your rifle doesn't like the 140 and 150 grain bullets? then what? you don't have enough twist to try the 160+ bullets. Whereas if you have 1:9 you can shoot everything. 2. Heavy vs. Light bullets. You're partially right that lighter bullets tend to shoot faster and flatter than heavy bullets..to a point. It's all about ballistic-coefficient (BC). BC puts a numberical value to the aerodynamics of a bullet. Generally speaking, heavier bullets have a better BC than lighter bullets. As a result, the heavier bullets will be able to maintain their velocity at longer ranges than the lighter bullets and they will have much less wind drift. (note: the higher the BC, the better) As an example, use whatever ballistic software you have and compare the trajectory, energy and wind drift of two 7mm bullets...150grain Nosler Ballistic Tip @ 2900fps (BC = .429) vs. 168grain VLD @ 2750fps (BC = .612). You will see that inside 600yards the 150 might have some superiority over the 168, but when you cross 600 yards you will see that the superior BC of the 168 will take over. From 600 to 1000yards, the 168 will be flatter, carry more energy and have less wind drift than the 150. When the range gets loooong, wind drift becomes more of an issue than flat trajectory. [/QUOTE]
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