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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6-284 long range antelope load
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<blockquote data-quote="Fiftydriver" data-source="post: 34940" data-attributes="member: 10"><p>Iron Worker,</p><p></p><p>I do not think you have a problem with your barrel first off. What I do think is that you are using a very slow powder for the bullet weight you are using.</p><p></p><p>For the 87 gr pills, Rl-19 and Rl-22 are much better burn rates then H-1000. If you want to stay with the Hodgdon powders which I agree are great for consistancy, try H-4831 as it is roughly the same burn rate as Rl-19.</p><p></p><p>One problem with using very slow powders behind a relatively light bullet is that it is very hard to get the chamber pressure up high enough to get an efficent and clean powder burn. </p><p></p><p>Because of this you will notice a large amount of powder fouling. This is easy to remove with Hoppe's #9 but it is still an accuracy robbing problem and it worsens with to slow a burning powders.</p><p></p><p>With the powders in the burn rate of Rl-19 to Rl-22 you will be working at higher pressures and will get a cleaner burn.</p><p></p><p>As far as seating into the rifling, that is a tricky thing to predict as far as velocity drop. It depends alot on the throat dimensions you have in your rifle.</p><p></p><p>My rifle is cut with a very tight 0.0002" over bullet diameter throat. I only loose 10-15 fps dropping off the lands 0.010". It may be interesting to you that my throat is also quite long and if I seat the bullets deep into the case, I actually get a velocity boost because it creates a situation of freebore.</p><p></p><p>This velocity boost is a result of being able to use more powder under a given bullet because the pressure spike is shallower because of the "freebore" situation.</p><p></p><p>Still accuracy is not as fine doing this so I seat my bullets hard into the rifling. By that I mean that I size my cases 0.00015" under bullet diameter so that the bullet is not held overly tight in the case, tight enough but thats all.</p><p></p><p>I seat the bullets all roughly 0.020" longer then the throat allows and when I chamber the round, the riflign will engage the bullet ogive and seat them all to the exact same position for each shot providing very consistant accuracy.</p><p></p><p>To do this accuractely you will need a bushing neck sizing die and you will need to turn your necks for consistancy as well. Everything needs to be basically perfect or this loading method does not perform well.</p><p></p><p>I clean my 6mm-284 every 25 shots to remove any powder fouling and with the Lilja barrel, I have found that I can clean it every 75 rounds to remove the copper with ease. They simply don't copper foul if theyare broke in properly.</p><p></p><p>Also, remember that I am driving a 30" tube, not a 28". I have 4" of barrel on you. That is dramatic. I am also using a 3 groove rifled barrel which will increase velocity as well. I also use a coated bullet which gives anothe 50 fps or so over non coated.</p><p></p><p>All in all, I would say the only thing youshould change is your powder selection. I am using Rl-22 in my rifle with the 107 gr Mk. I could probably use H-1000 in my rifle but I like the velocity and consistancy of the Rl-22 as well as the clean burning.</p><p></p><p>If I had your rifle come into the shop for load developement, the two powders I would load up first with your bullet selection would be R-19 and R-22. </p><p></p><p>You will get at least 3600 fps with those powders and probably a bit more.</p><p></p><p>Something to think about, Hornady lists the 240 Wby as only getting 3500 fps with only one powder using the 87 gr bullet. That powder is IMR-4320, very quick compared to H-1000. </p><p></p><p>The best all the other powders are getting is 3300 fps from the Hornady 24" barrel. I think your getting better then you think, jsut using to slow a powder. </p><p></p><p>Try something faster and see what happens.</p><p></p><p>Good Shooting!!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 34940, member: 10"] Iron Worker, I do not think you have a problem with your barrel first off. What I do think is that you are using a very slow powder for the bullet weight you are using. For the 87 gr pills, Rl-19 and Rl-22 are much better burn rates then H-1000. If you want to stay with the Hodgdon powders which I agree are great for consistancy, try H-4831 as it is roughly the same burn rate as Rl-19. One problem with using very slow powders behind a relatively light bullet is that it is very hard to get the chamber pressure up high enough to get an efficent and clean powder burn. Because of this you will notice a large amount of powder fouling. This is easy to remove with Hoppe's #9 but it is still an accuracy robbing problem and it worsens with to slow a burning powders. With the powders in the burn rate of Rl-19 to Rl-22 you will be working at higher pressures and will get a cleaner burn. As far as seating into the rifling, that is a tricky thing to predict as far as velocity drop. It depends alot on the throat dimensions you have in your rifle. My rifle is cut with a very tight 0.0002" over bullet diameter throat. I only loose 10-15 fps dropping off the lands 0.010". It may be interesting to you that my throat is also quite long and if I seat the bullets deep into the case, I actually get a velocity boost because it creates a situation of freebore. This velocity boost is a result of being able to use more powder under a given bullet because the pressure spike is shallower because of the "freebore" situation. Still accuracy is not as fine doing this so I seat my bullets hard into the rifling. By that I mean that I size my cases 0.00015" under bullet diameter so that the bullet is not held overly tight in the case, tight enough but thats all. I seat the bullets all roughly 0.020" longer then the throat allows and when I chamber the round, the riflign will engage the bullet ogive and seat them all to the exact same position for each shot providing very consistant accuracy. To do this accuractely you will need a bushing neck sizing die and you will need to turn your necks for consistancy as well. Everything needs to be basically perfect or this loading method does not perform well. I clean my 6mm-284 every 25 shots to remove any powder fouling and with the Lilja barrel, I have found that I can clean it every 75 rounds to remove the copper with ease. They simply don't copper foul if theyare broke in properly. Also, remember that I am driving a 30" tube, not a 28". I have 4" of barrel on you. That is dramatic. I am also using a 3 groove rifled barrel which will increase velocity as well. I also use a coated bullet which gives anothe 50 fps or so over non coated. All in all, I would say the only thing youshould change is your powder selection. I am using Rl-22 in my rifle with the 107 gr Mk. I could probably use H-1000 in my rifle but I like the velocity and consistancy of the Rl-22 as well as the clean burning. If I had your rifle come into the shop for load developement, the two powders I would load up first with your bullet selection would be R-19 and R-22. You will get at least 3600 fps with those powders and probably a bit more. Something to think about, Hornady lists the 240 Wby as only getting 3500 fps with only one powder using the 87 gr bullet. That powder is IMR-4320, very quick compared to H-1000. The best all the other powders are getting is 3300 fps from the Hornady 24" barrel. I think your getting better then you think, jsut using to slow a powder. Try something faster and see what happens. Good Shooting!!! Kirby Allen(50) [/QUOTE]
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