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.300 win mag barrel length and twist...
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<blockquote data-quote="johnlittletree" data-source="post: 1507264" data-attributes="member: 105653"><p>I like a 28 inch barrel with a 1:8 to 1:10 twist. You are only limited in bullet weight by twist, barrel length and how you set up the chamber. It depends on what bullet maker you plan on using and if it is a hunting bullet, hybrid or VLD target bullet! Because each barrel maker has massive differences from one to the next you might have best luck with your Brux Barrel in 1:10 but maybe you need to use a 1:9 from Hart to get the same velocity, SD and some sort of accuracy with similar load. </p><p></p><p>Normally I will call the barrel maker I want to use and have a good idea of what I want but I do not shake my fist at my barrel maker and start barking at him what I want. I will give him a call tell them what I think I want and why and then ask them what they think! They supply barrels to a lot of high end smiths and competitors and most of them are shooters too. Most of all they know their product and what it likes and does not like. Twice I have been talked into a slower twist than I thought I wanted. The thing is they know their product better than I do. So far so good. That said I tend to like a faster twist than most to allow for a heavier VLD bullet that I know is just a matter of time! A lot of rifles end up becoming kind of obsolete when major changes in technology for powder, primer, and bullet construction. I do not think anyone would have predicted the huge increase in the bullet weights available today for the 223/5.56 20 years ago. When this happens unless you rebarrel you are limited in what you can shoot through the rifle well! </p><p></p><p>My F-Class rifle has a 32 inch cut rifled barrel. It is 6.5mm and it has fairly slow 1:9 or 1:9.5. It shots Berger 6.5mm 140 VLD's no problem. If it was shorter or from a different OEM it might be a different story. You see this all the time with .308Win/7.62 NATO some guys are happy as a kit at the beach with 1:12 and some want 1:8.</p><p></p><p>So I like to go a little bit faster than what ever is the norm. Most factory rifles go the other direction and are a tad slower than is ideal. Some projectiles are known to favor bore dimensions that are anything but standard you saw this a lot in Palma decades ago. Back when Palma was all the rage almost ever barrel maker had internal diemensions specific to Palma based on the 155gr 7.62 bullet in use. by some requiring .3065 for tight grove. Who would have ever thought? So think about what you want but also future proof your rifle! </p><p></p><p>If you are going with a carbon wrapped/spon barrel from Proof you might as well take advantage of the reduced weight and aim for a finished length of 28 inches unless you think the area you will hunt will not support this length. 1:10 will Stablize Berger 230gr bullet so anything 1:10 to 1:8. I have 2x 1:8 barrels in 30 Cal and have never had a problem with it being "two fast". As I see it the point of a carbon spun barrel is that you can go with a larger profile or longer barrel and still have the same weight as a shorter or thinner profile all steel barrel. I have owned a lot of 300 Win Mag rifles over the years and I think 26 inches is the minimum I would go with if I really wanted to push the performance! Plenty of companies in the past offered 24inch magnum barrels but I think today's norm is 26 for most magnum rifle! 20 years ago there was no such thing as a VLD 230gr bullet for 30cal. If you had a 220gr for 30 cal it was a round nose soft point.</p></blockquote><p></p>
[QUOTE="johnlittletree, post: 1507264, member: 105653"] I like a 28 inch barrel with a 1:8 to 1:10 twist. You are only limited in bullet weight by twist, barrel length and how you set up the chamber. It depends on what bullet maker you plan on using and if it is a hunting bullet, hybrid or VLD target bullet! Because each barrel maker has massive differences from one to the next you might have best luck with your Brux Barrel in 1:10 but maybe you need to use a 1:9 from Hart to get the same velocity, SD and some sort of accuracy with similar load. Normally I will call the barrel maker I want to use and have a good idea of what I want but I do not shake my fist at my barrel maker and start barking at him what I want. I will give him a call tell them what I think I want and why and then ask them what they think! They supply barrels to a lot of high end smiths and competitors and most of them are shooters too. Most of all they know their product and what it likes and does not like. Twice I have been talked into a slower twist than I thought I wanted. The thing is they know their product better than I do. So far so good. That said I tend to like a faster twist than most to allow for a heavier VLD bullet that I know is just a matter of time! A lot of rifles end up becoming kind of obsolete when major changes in technology for powder, primer, and bullet construction. I do not think anyone would have predicted the huge increase in the bullet weights available today for the 223/5.56 20 years ago. When this happens unless you rebarrel you are limited in what you can shoot through the rifle well! My F-Class rifle has a 32 inch cut rifled barrel. It is 6.5mm and it has fairly slow 1:9 or 1:9.5. It shots Berger 6.5mm 140 VLD's no problem. If it was shorter or from a different OEM it might be a different story. You see this all the time with .308Win/7.62 NATO some guys are happy as a kit at the beach with 1:12 and some want 1:8. So I like to go a little bit faster than what ever is the norm. Most factory rifles go the other direction and are a tad slower than is ideal. Some projectiles are known to favor bore dimensions that are anything but standard you saw this a lot in Palma decades ago. Back when Palma was all the rage almost ever barrel maker had internal diemensions specific to Palma based on the 155gr 7.62 bullet in use. by some requiring .3065 for tight grove. Who would have ever thought? So think about what you want but also future proof your rifle! If you are going with a carbon wrapped/spon barrel from Proof you might as well take advantage of the reduced weight and aim for a finished length of 28 inches unless you think the area you will hunt will not support this length. 1:10 will Stablize Berger 230gr bullet so anything 1:10 to 1:8. I have 2x 1:8 barrels in 30 Cal and have never had a problem with it being "two fast". As I see it the point of a carbon spun barrel is that you can go with a larger profile or longer barrel and still have the same weight as a shorter or thinner profile all steel barrel. I have owned a lot of 300 Win Mag rifles over the years and I think 26 inches is the minimum I would go with if I really wanted to push the performance! Plenty of companies in the past offered 24inch magnum barrels but I think today's norm is 26 for most magnum rifle! 20 years ago there was no such thing as a VLD 230gr bullet for 30cal. If you had a 220gr for 30 cal it was a round nose soft point. [/QUOTE]
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