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| quote: The reason a bullet leaves the barrel tip up is because the bullet must cross the line of sight for the scope. Therefore, the barrel is pointed up, not parallel to the ground. I'm not aware of anyone who'd ever try and shoot with a barrel parallel to the ground. Sorry I didn't realize people didn't get that one.
ALL bullets must go up and cross the line of sight, whether the sight is a scope or some kind of iron sight setup. Then they start downward somewhere downrange after reaching the apogee (maximum ordinate) of the trajectory curve, and then drop across the line again in the descending segment of the trajectory. So the bullet may indeed by travelling in a nose-up attitued in regard to the line of sight, but not in respect to the line of the bore. How great this "angle of attack" may be depends on how far away the zero point is, and how high the bullet has to ascend above the line of sight to hit that zero point on the way back down along the trajectory.
"Bitte, trinks du nicht das Wasser. Dahin haben die Kuhen gesheissen."
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| | | Posts: 4386 | Location: New Woodstock, Madison County, Central NY | Registered: 04 January 2005 | 
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| quote: How great this "angle of attack may be depends on how far away the zero point is, and how high the bullet has to ascend above the line of sight to hit that point on the way down
The angle is based on the angle of the rifle barrel relative to the ground when fired. It doesn't make any difference how far the target is, whether it's an inch away or three hundred yards. The bullet's orientation (yaw)doesn't change unless acted on by some other force or it goes into the transonic range. |
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| quote:
The 7mmRem mag has a very short barrel life.So does the 270WSM. I would not want to own a 7mm Ultra or STW.The 7mmRem mag can stand only about 70 or so max loaded rds before it loses its ability to stablize bullets(any bullet,seated however).  I have owned three 7mmremmags,three 7mmstws,and a 7mm ultramag. I fired over 1500 rounds through my first 7mmremmag and it still shot sub MOA. I fired a few hundred through the other two and the accuracy was still as good as it ever was. I fired over 1000 rounds through my first 7mmstw and it still held 3/4MOA when I sold it which was almost as good as it did new. Both of my current 7mmstw rifles have 300 to 500 rounds through them and both still shoot 1/2 MOA with their favorite load. The 7mm ultramag has about 200 rounds through it and still averages 3/4MOA as it did new. |
| | | Posts: 3104 | Location: alberta,canada | Registered: 28 January 2002 |
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| Were you firing max loads or the lightest loads you could shoot. |
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| Hello,
When I shot long range prone matches, there were more than a few shooters, some outstanding I might add, shot the Rem7mm Mag. and believe where the short barrel life issue comes to play is that during these matches one shoots minimum of twenty times and occasional sighters and this is done in a time frame of no more than 30 minutes and sometimes in 22 minutes(two sighters plus 20 for record.) Nearly a shot a minute if not faster does indeed build some fierce heat and wear and tear on the bore/throat area. I do not have scientific facts to support, but many of those shooters as described above felt the barrels were gone after some 12-1500 rounds??? Is that true, they thought it was and some of the most experienced shooters frankly in the world, so who is to argue? Not me and stuck with the 308 and normally would shoot something over 3000 rounds before noticed any serious throat erosion. Hard to believe a hunter would ever shoot out a barrel or at least a "normal" hunter. For those shooting such matches it was not uncommon for the person to have the rifle he/she is shooting, one in the shop having barrel work done, and one in reserve. |
| | | Posts: 1165 | Location: Banks of Kanawha, forks of Beaver Dam and Spring Creek | Registered: 06 January 2005 |
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| quote: Originally posted by dsiteman:
Hello,
When I shot long range prone matches, there were more than a few shooters, some outstanding I might add, shot the Rem7mm Mag. and believe where the short barrel life issue comes to play is that during these matches one shoots minimum of twenty times and occasional sighters and this is done in a time frame of no more than 30 minutes and sometimes in 22 minutes(two sighters plus 20 for record.) Nearly a shot a minute if not faster does indeed build some fierce heat and wear and tear on the bore/throat area. I do not have scientific facts to support, but many of those shooters as described above felt the barrels were gone after some 12-1500 rounds??? Is that true, they thought it was and some of the most experienced shooters frankly in the world, so who is to argue? Not me and stuck with the 308 and normally would shoot something over 3000 rounds before noticed any serious throat erosion. Hard to believe a hunter would ever shoot out a barrel or at least a "normal" hunter. For those shooting such matches it was not uncommon for the person to have the rifle he/she is shooting, one in the shop having barrel work done, and one in reserve.
This sounds pretty reasonable to me-1200-1500 rounds from the 7mm Maggie, and around 3000 from a .308 under the same usage conditions. One shot per minute on average for one of those 20-round, long-range matches...........
"Bitte, trinks du nicht das Wasser. Dahin haben die Kuhen gesheissen."
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| | | Posts: 4386 | Location: New Woodstock, Madison County, Central NY | Registered: 04 January 2005 |
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| What does one of you consider a Hot load for a Rem Mag. FPS ?. Do some manufactures use better grades of steel in their barrels ?. Are pre 64 weapons better than newer ones ?. It is in my opinion along with several ballistic experts that significant erosive powder action occurs above 3500 FPS. There for calibers such as the .204 and others would indeed diminish accuracy after so many rounds . I still find it highly improbable that a 7 MM Mag barrel life is as short as 1500 rounds . I must disagree with this theory based on metallurgical evidence of powder copper lead erosive actions on quality steel . Shoot Straight Know your Target . ...  |
| | | Posts: 1738 | Location: Southern Calif. | Registered: 08 April 2006 |
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| Did we ever figure out why Kedron's rifle was keyholing? |
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| | | Posts: 1343 | Location: Northern California | Registered: 15 January 2006 |
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| quote: Were you firing max loads or the lightest loads you could shoot.
I alway shoot max loads in my rifles.I don't see the point of using a magnum cartridge,and not taking advantage of it's case capacity.My 7mmremmags were shooting around 3200fps with a 140gr bullet out of a 24" barrel.The 7mmstws are developing 3500fps with the 140 bullet out of a 26" barrel.The 7mmultramag is developing 3570fps with 140gr bullets and a 26" barrel. |
| | | Posts: 3104 | Location: alberta,canada | Registered: 28 January 2002 |
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