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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Testing two rifles, identical chambers ...different barrels
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<blockquote data-quote="Fiftydriver" data-source="post: 111511" data-attributes="member: 10"><p>GG,</p><p></p><p>Not sure with Daves 338 but with my 338 AM I will top out in pressure before I top out the case capacity with a 300 gr pill and H-50BMG. That said, I do load up to 149.0 gr H-50BMG with my top end load. This is a 98 to 99% load density in my 338 AM. </p><p></p><p>With the 350 gr ULD RBBT, I have a significant amount of air in the case. I would say topping out at around 90% load density with H-50BMG.</p><p></p><p>I would be a bit on the nervous side to try Retumbo in my 338 AM at least with a 300 gr pill or heavier. H-50BMG seems about right for the 300 gr SMK and I am loaded up and ready to test VV 20N29 in the 300 and 350 gr loads as well here soon as I get out to the range.</p><p></p><p>I am pretty sure BD408 can go up quite a bit in powder charge and would also increase velocity some as well and get a cleaner burn out of his 338 ST.</p><p></p><p>On the dark bullet hole thing, you may be onto something but also consider that the 300 gr SMK has nearly the same meplat as most 22 and 6mm caliber match bullets. Only difference there is a whole lot more bullet diameter so there will be similiar initial paper tear from the meplat but much more paper stretching around the larger diameter bullet resulting in more paper to bullet contact. I suspect this is the reason for the larger black areas on the target more then anything. </p><p></p><p>If you look at an expansion ratio comparision, this class of 338 rounds has a lower expansion ratio then even my 7mm AM.</p><p></p><p>The only problem with case capacities this large and bullets this heavy is that things can get serious real quick. That is where the slow burning powders give a bit extra cushion in safety margin as they give you a bit more warning when your getting to the top.</p><p></p><p>Maybe Retumbo would get some more fps but I suspect it would be a bit tricky getting it to shoot consistantly well at these top end velocities. Just what I have seen with the really big 338s. </p><p></p><p>Now a 250 gr pill, I would say that would be a very practical powder choice.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 111511, member: 10"] GG, Not sure with Daves 338 but with my 338 AM I will top out in pressure before I top out the case capacity with a 300 gr pill and H-50BMG. That said, I do load up to 149.0 gr H-50BMG with my top end load. This is a 98 to 99% load density in my 338 AM. With the 350 gr ULD RBBT, I have a significant amount of air in the case. I would say topping out at around 90% load density with H-50BMG. I would be a bit on the nervous side to try Retumbo in my 338 AM at least with a 300 gr pill or heavier. H-50BMG seems about right for the 300 gr SMK and I am loaded up and ready to test VV 20N29 in the 300 and 350 gr loads as well here soon as I get out to the range. I am pretty sure BD408 can go up quite a bit in powder charge and would also increase velocity some as well and get a cleaner burn out of his 338 ST. On the dark bullet hole thing, you may be onto something but also consider that the 300 gr SMK has nearly the same meplat as most 22 and 6mm caliber match bullets. Only difference there is a whole lot more bullet diameter so there will be similiar initial paper tear from the meplat but much more paper stretching around the larger diameter bullet resulting in more paper to bullet contact. I suspect this is the reason for the larger black areas on the target more then anything. If you look at an expansion ratio comparision, this class of 338 rounds has a lower expansion ratio then even my 7mm AM. The only problem with case capacities this large and bullets this heavy is that things can get serious real quick. That is where the slow burning powders give a bit extra cushion in safety margin as they give you a bit more warning when your getting to the top. Maybe Retumbo would get some more fps but I suspect it would be a bit tricky getting it to shoot consistantly well at these top end velocities. Just what I have seen with the really big 338s. Now a 250 gr pill, I would say that would be a very practical powder choice. Good Shooting!! Kirby Allen(50) [/QUOTE]
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Testing two rifles, identical chambers ...different barrels
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