Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Next Sin Cartridge?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Long Time Long Ranger" data-source="post: 526978" data-attributes="member: 505"><p>Oliver, your assumptions are not accurate. The first major point is your 6.5-300 win mag which is a cartridge that has been done for nearly 50 years. It never caught on because it wasn't as good as necking the 300 wby case or the 8mm remington case. Same thing with the 7mm-300 win mag. Both those cases are better and easily outperform the 300 winchester case. I have done all of them and shot them all quite a bit since the 70's.</p><p> </p><p>You must understand you have a miracle one in a million rifle. Enjoy it and shoot it. It is the fastest one by about 150 fps I have ever heard of. I have a 26" barrel 300 wby mag that shoots the exact same numbers as my 300 RUM with a 28" barrel. Easily into the 3400's fps with a 180 grain and easily over 3200 fps with the 200 grain. It should not be assumed anyone can get a 300 wby and it shoot this fast. Just like anyone would be a fool to think they could get the old 6.5-300 win mag and shoot your kind of velocities. Your rifle and mine are so far out of the norm we just enjoy them and move on. </p><p> </p><p>There is absolutely no comparison of the 6.5-300 win mag to the SIN cartridge. The SIN is so far beyond it in all respects. It is a shorter fatter case that is far more efficient than the 300 win mag, 300 wby or 8mm rem mag case and holds quite a bit more powder than either of those. This allows it to utilize faster burning powders getting top velocities in shorter barrels with much better barrel life. It will be faster than the 6.5-300 wby and 6.5 STW which are both 100+fps faster than a 6.5-300 winchester.</p><p> </p><p>The way to wildcat now is by using the new beltless cases available. By improving them they take advantage of more efficient case designs that produce better results with shorter barrels. Headspacing off the shoulder with a beltless cartridge is preffered by most top shooters. Even on a belted case many top shooters including myself set the chamber to headspace off the shoulder anyway. A little difficulty and knowledge are required to prevent case head seperation in front of the belt. But going back and trying to reinvent the wheel by necking the 300 winchester case is not a good idea. We gave up on that one 40 years ago because we could beat it with other cartridges available then. Now there are many others.</p><p> </p><p>I have never shot a 6.5 SIN but I have a good idea what it will do just like I was right on the money with what the 338 SIN would do. Experience allows you to predict those things. I can guarantee anyone it will overwhelm the average 300 winchester necked.</p><p> </p><p>In similarly designed cases increasing powder capacity can make a noticable fps increase with smaller calibers from 7mm down and some even up to 30 cal. But once you get to 338 caliber and larger it takes quite a bit of powder capacity in a similarly designed case to make a noticable difference with most cases we have to work with. This has to do quite a bit with the powder burn rates that can be used. It also has to do with case design and how efficient it is. Larger calibers can utilize faster burning powders better and so can more efficient case designs. Larger bores adds volume for powder burn which is a primary difference for this anomaly. That is why there is hardly any difference in fps from the 340 wby up through the 338 SIN, 338 and 338-300 RUM's and into the 338 Lapua. About 120 fps with 12-15 grains powder difference. 12-15 grains of powder in a 6.5 or 7mm would see a significant velocity increase. That is why you have to get up into the 378 wby, 416 Rigby, or Excalibur case in 338 to see a significant velocity increase over the previous 338's I just listed. </p><p> </p><p> </p><p>The significant increased powder capacity plus the efficient short, fat SIN case design in 6.5 caliber would overwhelm the 264 winchester or 6.5-300 winchester which are nearly the same thing, within 100 fps difference anyway.</p></blockquote><p></p>
[QUOTE="Long Time Long Ranger, post: 526978, member: 505"] Oliver, your assumptions are not accurate. The first major point is your 6.5-300 win mag which is a cartridge that has been done for nearly 50 years. It never caught on because it wasn't as good as necking the 300 wby case or the 8mm remington case. Same thing with the 7mm-300 win mag. Both those cases are better and easily outperform the 300 winchester case. I have done all of them and shot them all quite a bit since the 70's. You must understand you have a miracle one in a million rifle. Enjoy it and shoot it. It is the fastest one by about 150 fps I have ever heard of. I have a 26" barrel 300 wby mag that shoots the exact same numbers as my 300 RUM with a 28" barrel. Easily into the 3400's fps with a 180 grain and easily over 3200 fps with the 200 grain. It should not be assumed anyone can get a 300 wby and it shoot this fast. Just like anyone would be a fool to think they could get the old 6.5-300 win mag and shoot your kind of velocities. Your rifle and mine are so far out of the norm we just enjoy them and move on. There is absolutely no comparison of the 6.5-300 win mag to the SIN cartridge. The SIN is so far beyond it in all respects. It is a shorter fatter case that is far more efficient than the 300 win mag, 300 wby or 8mm rem mag case and holds quite a bit more powder than either of those. This allows it to utilize faster burning powders getting top velocities in shorter barrels with much better barrel life. It will be faster than the 6.5-300 wby and 6.5 STW which are both 100+fps faster than a 6.5-300 winchester. The way to wildcat now is by using the new beltless cases available. By improving them they take advantage of more efficient case designs that produce better results with shorter barrels. Headspacing off the shoulder with a beltless cartridge is preffered by most top shooters. Even on a belted case many top shooters including myself set the chamber to headspace off the shoulder anyway. A little difficulty and knowledge are required to prevent case head seperation in front of the belt. But going back and trying to reinvent the wheel by necking the 300 winchester case is not a good idea. We gave up on that one 40 years ago because we could beat it with other cartridges available then. Now there are many others. I have never shot a 6.5 SIN but I have a good idea what it will do just like I was right on the money with what the 338 SIN would do. Experience allows you to predict those things. I can guarantee anyone it will overwhelm the average 300 winchester necked. In similarly designed cases increasing powder capacity can make a noticable fps increase with smaller calibers from 7mm down and some even up to 30 cal. But once you get to 338 caliber and larger it takes quite a bit of powder capacity in a similarly designed case to make a noticable difference with most cases we have to work with. This has to do quite a bit with the powder burn rates that can be used. It also has to do with case design and how efficient it is. Larger calibers can utilize faster burning powders better and so can more efficient case designs. Larger bores adds volume for powder burn which is a primary difference for this anomaly. That is why there is hardly any difference in fps from the 340 wby up through the 338 SIN, 338 and 338-300 RUM's and into the 338 Lapua. About 120 fps with 12-15 grains powder difference. 12-15 grains of powder in a 6.5 or 7mm would see a significant velocity increase. That is why you have to get up into the 378 wby, 416 Rigby, or Excalibur case in 338 to see a significant velocity increase over the previous 338's I just listed. The significant increased powder capacity plus the efficient short, fat SIN case design in 6.5 caliber would overwhelm the 264 winchester or 6.5-300 winchester which are nearly the same thing, within 100 fps difference anyway. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Next Sin Cartridge?
Top