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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.375/416 Barret?
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<blockquote data-quote="Fiftydriver" data-source="post: 377937" data-attributes="member: 10"><p>BD408,</p><p> </p><p>Curious why you think the 350 gr SMK would have any problems at 3400 fps? I have never seen any SMK bullet above 6mm bore size have any issued with velocity even up to and including 3600 fps.</p><p> </p><p>That said, MOST solids seem to have serious accuracy problems at velocity much over 3200 fps. Some will do a bit better but most drop off in accuracy dramatically and it seems the higher the BC the harder velocity is on these bullets.</p><p> </p><p>I will admit that I have pushed the 300 gr SMK and 350 gr SMK FAR harder then they should be in my 338 AM and 375 AM using the old TTI cases which are simply amazing and sorely missed. In my 40" 338 AM I broke 3600 fps with the 300 gr SMK and with a 36" 375 AM I pushed the 350 gr SMK right to 3500 fps. Is this a practical load, certainly not, far to high in pressure. My goal was to see if the SMK had any limits as far as accuracy and velocity were concerned. Never was there any real change in accuracy.</p><p> </p><p>Certainly we could do much better with a different bullet design but the 350 gr SMK does shoot very well in most barrels and is not limited to specific bore diameter that many solid bullets are handicapped by. Call me old fashioned but give me a lead core bullet over any solid just for their reliability in a variaty of bore diameters.</p><p> </p><p>Also a bit surpised that your Bertram is as strong as your reporting. I have never seen any of their brass handle pressure well at all, weither it be the 408 CT, 505 Gibbs or 577 Tyrann case. They must have REALLY beefed up the case head on the cases your using.</p><p> </p><p>I have talked with Jamison about building me a new case. Will not offer any details yet but it would work in 408 CT receivers, single shot or repeaters and would offer case capacities roughly 20-22 grains higher in powder charge then my 338 and 375 AM.</p><p> </p><p>Only problem and the main reason I have not gone full steam on this is that brass would be estimated in the $6.50 to $8.00 range each and of all the potential customers I have talked to, they said they would not spend the money on the brass to get another 100 or even 200 fps over the 338 and 375 AM and have brass that is 2 to nearly 3 times more expensive then the fully formed and correct headstamped AMs based on the 408 CT.</p><p> </p><p>Just wondering what market there will be for a rifle that shoots a round that takes $8.00 out of your pocket every time you buy a piece of brass. That has always been my hold up with these projects that go beyond the 408 CT case size. Hell, the 50 BMG is 1/2 the cost of even 408 CT brass. Admittedly, its much larger then needed but its cheap. Just wish we had some good brass at reasonable prices.</p><p> </p><p>God I miss the TTI brass of days gone by. With that brass, the 408 CT based rounds would easily match anything on the 50 Spotter or 416 Barrett case. Oh well.</p><p> </p><p> </p><p> </p><p>I have polled many of my customers that are interested or looking into a rifle in this class and ask</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 377937, member: 10"] BD408, Curious why you think the 350 gr SMK would have any problems at 3400 fps? I have never seen any SMK bullet above 6mm bore size have any issued with velocity even up to and including 3600 fps. That said, MOST solids seem to have serious accuracy problems at velocity much over 3200 fps. Some will do a bit better but most drop off in accuracy dramatically and it seems the higher the BC the harder velocity is on these bullets. I will admit that I have pushed the 300 gr SMK and 350 gr SMK FAR harder then they should be in my 338 AM and 375 AM using the old TTI cases which are simply amazing and sorely missed. In my 40" 338 AM I broke 3600 fps with the 300 gr SMK and with a 36" 375 AM I pushed the 350 gr SMK right to 3500 fps. Is this a practical load, certainly not, far to high in pressure. My goal was to see if the SMK had any limits as far as accuracy and velocity were concerned. Never was there any real change in accuracy. Certainly we could do much better with a different bullet design but the 350 gr SMK does shoot very well in most barrels and is not limited to specific bore diameter that many solid bullets are handicapped by. Call me old fashioned but give me a lead core bullet over any solid just for their reliability in a variaty of bore diameters. Also a bit surpised that your Bertram is as strong as your reporting. I have never seen any of their brass handle pressure well at all, weither it be the 408 CT, 505 Gibbs or 577 Tyrann case. They must have REALLY beefed up the case head on the cases your using. I have talked with Jamison about building me a new case. Will not offer any details yet but it would work in 408 CT receivers, single shot or repeaters and would offer case capacities roughly 20-22 grains higher in powder charge then my 338 and 375 AM. Only problem and the main reason I have not gone full steam on this is that brass would be estimated in the $6.50 to $8.00 range each and of all the potential customers I have talked to, they said they would not spend the money on the brass to get another 100 or even 200 fps over the 338 and 375 AM and have brass that is 2 to nearly 3 times more expensive then the fully formed and correct headstamped AMs based on the 408 CT. Just wondering what market there will be for a rifle that shoots a round that takes $8.00 out of your pocket every time you buy a piece of brass. That has always been my hold up with these projects that go beyond the 408 CT case size. Hell, the 50 BMG is 1/2 the cost of even 408 CT brass. Admittedly, its much larger then needed but its cheap. Just wish we had some good brass at reasonable prices. God I miss the TTI brass of days gone by. With that brass, the 408 CT based rounds would easily match anything on the 50 Spotter or 416 Barrett case. Oh well. I have polled many of my customers that are interested or looking into a rifle in this class and ask [/QUOTE]
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.375/416 Barret?
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