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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm WSM long throating
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<blockquote data-quote="mooredj" data-source="post: 3065597" data-attributes="member: 121913"><p>Just some data I put together since I am jumping into the 7 SAUM arena. I am really working on getting the heavies to work. I wanted just a bit more powder capacity to makes sure I can get to 2900fps. I have set this up with a 0.218 freebore as designated by the column noted in green. The arrow on the bottom left points to the bullet seating depth. The arrow on the right is what I have settled on for shooting the Berger 195 EOL. I have been told what you need is bore diameter bullet seating and that is shown at 0.284. The cartridge neck length is 0.311. The bullet is seated in the case of the seating depth at 0.311 so that the bearing surface starts right at the case neck junction with the boat tail below that point. The boat tail is slightly up the neck when the bullet is seated at 0.284. I am taking a page from Brian Litz on seating depth for the Berger hybrids and assuming I will find accuracy at a jump of 0.025 with a seating depth of 0.284. If what he says holds true, I will keep shooting the same load with the same bullet seating depth until accuracy falls off at some point. In the meantime I will keep measuring the throat to see how fast it moves. Pay attention to the COAL on the far right. I will be shooting this out of a Zermatt Arms TL3 long action so no issues for me but a short action will be a problem. You really need a long action to stretch out the legs on the 7 SAUM with heavies. If I want to shoot the 180 Hybrids, I will not be able to seat to bore diameter. It can be done but I will probably need to single load to make sure the bullet stays concentric during loading. Okay for target and not ideal for hunting loaded in a magazine. This design does open up lots of possibilities using some of the other heavies.</p><p></p><p>You can also see what the SAAMI design looks like with the 0.90 freebore using a 1 degree throat angle. You can see how the 180 hybrids work but where using the heavies becomes an issue since you can't get the powder capacity you need to get them to shoot inside the 180 hybrids.</p><p></p><p><strong>[ATTACH=full]555906[/ATTACH]</strong></p></blockquote><p></p>
[QUOTE="mooredj, post: 3065597, member: 121913"] Just some data I put together since I am jumping into the 7 SAUM arena. I am really working on getting the heavies to work. I wanted just a bit more powder capacity to makes sure I can get to 2900fps. I have set this up with a 0.218 freebore as designated by the column noted in green. The arrow on the bottom left points to the bullet seating depth. The arrow on the right is what I have settled on for shooting the Berger 195 EOL. I have been told what you need is bore diameter bullet seating and that is shown at 0.284. The cartridge neck length is 0.311. The bullet is seated in the case of the seating depth at 0.311 so that the bearing surface starts right at the case neck junction with the boat tail below that point. The boat tail is slightly up the neck when the bullet is seated at 0.284. I am taking a page from Brian Litz on seating depth for the Berger hybrids and assuming I will find accuracy at a jump of 0.025 with a seating depth of 0.284. If what he says holds true, I will keep shooting the same load with the same bullet seating depth until accuracy falls off at some point. In the meantime I will keep measuring the throat to see how fast it moves. Pay attention to the COAL on the far right. I will be shooting this out of a Zermatt Arms TL3 long action so no issues for me but a short action will be a problem. You really need a long action to stretch out the legs on the 7 SAUM with heavies. If I want to shoot the 180 Hybrids, I will not be able to seat to bore diameter. It can be done but I will probably need to single load to make sure the bullet stays concentric during loading. Okay for target and not ideal for hunting loaded in a magazine. This design does open up lots of possibilities using some of the other heavies. You can also see what the SAAMI design looks like with the 0.90 freebore using a 1 degree throat angle. You can see how the 180 hybrids work but where using the heavies becomes an issue since you can't get the powder capacity you need to get them to shoot inside the 180 hybrids. [B][ATTACH type="full" alt="1710987516616.png"]555906[/ATTACH][/B] [/QUOTE]
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7mm WSM long throating
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