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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Cartridge Comparison - Need everyones help and input
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<blockquote data-quote="Autorotate" data-source="post: 596252" data-attributes="member: 8073"><p>drenner43-</p><p> </p><p>The internet forums miss some of the key components of normal spoken communication....I'm sure MikeCRs response in person would be better delivered/recieved.</p><p> </p><p>But I do agree...the thread your talking about would be tough.</p><p> </p><p>For example on the topics of wildcats....and say throat design.....the specifics to those are key to establishing the velocity potential of those cases.</p><p> </p><p>Based on the experience of a 300 RUM AI, 30-338 Lapua Improved, a 338 Lapua Improved, and a 375 Cheytac Improved (it's almost embarrassing to admit all these wildcats now....), I expect to be able to realize a 60-70% utilization of the new formed case capacity gain from the unformed parent case capacity using the Ramshot Mag/H1000/Retumbo burn rate class of powders.</p><p> </p><p>Example- 338 Benford Magnum (just made that up), holds 100 grains unformed. Max load where we start to see pressure in a SAAMI chamber is 100 grains with a 250 grain Benford bullet. Now we wildcat it...lets call it the 338 Benford Magnum JE Improved. We blow the taper out, steepen up the shoulder, and load us up some fireform loads. Boom, formed case holds 120 grains. We see an increase of 20 grains of case capacity. I would expect to see the new max load to use 60-70% of the new case capacity, or around 100 grains + (20 gr times .65)=112 to 114 grains. Say we had a 24" barrel on this rifle...the MV gain would be minimal. But say this was a 30" barrel....now we might be doing some good!</p><p> </p><p>Example2-Say on the 338 Benford Magnum example above...we had one rifle throated for a 210 grain "hunting" bullet...and one throated for a 350 grain long secant ogive "match" bullet.....and the useable case capacity with a bullet seated to the lands was 10 grains different. Again...velocity potential could span a wide spectrum depending on barrel length, powder class, and heck even the brand of brass used (as some you can pressure up pretty good without knowing it)</p><p> </p><p>That's where I was coming from. If the above was old news already, I apologize in advance. If nothing else, if this thread rocks on, folks will read the above, and the data they post will reflect the concerns above.</p><p> </p><p>And I'll be happy to post my rifles, but it will take me a day or two to dig around on my laptop.</p><p> </p><p>Good luck, and good shooting! gun)</p></blockquote><p></p>
[QUOTE="Autorotate, post: 596252, member: 8073"] drenner43- The internet forums miss some of the key components of normal spoken communication....I'm sure MikeCRs response in person would be better delivered/recieved. But I do agree...the thread your talking about would be tough. For example on the topics of wildcats....and say throat design.....the specifics to those are key to establishing the velocity potential of those cases. Based on the experience of a 300 RUM AI, 30-338 Lapua Improved, a 338 Lapua Improved, and a 375 Cheytac Improved (it's almost embarrassing to admit all these wildcats now....), I expect to be able to realize a 60-70% utilization of the new formed case capacity gain from the unformed parent case capacity using the Ramshot Mag/H1000/Retumbo burn rate class of powders. Example- 338 Benford Magnum (just made that up), holds 100 grains unformed. Max load where we start to see pressure in a SAAMI chamber is 100 grains with a 250 grain Benford bullet. Now we wildcat it...lets call it the 338 Benford Magnum JE Improved. We blow the taper out, steepen up the shoulder, and load us up some fireform loads. Boom, formed case holds 120 grains. We see an increase of 20 grains of case capacity. I would expect to see the new max load to use 60-70% of the new case capacity, or around 100 grains + (20 gr times .65)=112 to 114 grains. Say we had a 24" barrel on this rifle...the MV gain would be minimal. But say this was a 30" barrel....now we might be doing some good! Example2-Say on the 338 Benford Magnum example above...we had one rifle throated for a 210 grain "hunting" bullet...and one throated for a 350 grain long secant ogive "match" bullet.....and the useable case capacity with a bullet seated to the lands was 10 grains different. Again...velocity potential could span a wide spectrum depending on barrel length, powder class, and heck even the brand of brass used (as some you can pressure up pretty good without knowing it) That's where I was coming from. If the above was old news already, I apologize in advance. If nothing else, if this thread rocks on, folks will read the above, and the data they post will reflect the concerns above. And I'll be happy to post my rifles, but it will take me a day or two to dig around on my laptop. Good luck, and good shooting! gun) [/QUOTE]
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