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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
please advise re: seating depth
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<blockquote data-quote="rufous" data-source="post: 24842" data-attributes="member: 122"><p>Thanks for the replies and suggestions. If I do lengthen the magazine box it would be from the back end. The guy who makes these boxes that Brownells sells would do the machining. He said he can give me about 0.2" more room. But it is looking like I may not need to. I was out shooting the Swift 180 Scirocco and trying deeper seating depths. That bullet is touching the lands at about 3.65" overall length. I tried a couple days ago a seating depth of 3.625, 3.59 and 3.35". At 3.35" and 76 grains of RL22 I got a 3 shot group of 1.14". Then today I tried 75.5 grains of RL22. A seating depth of 3.36" gave a group of 1.55". Seating depth of 3.37" gave 1.14" and seat depth of 3.38" gave a group of 0.79". Then a seat depth of 3.39" gave a group of 0.63". Finally I tried 75 grains with a seating depth of 3.38" and got a group of 0.43". So now I need to try 75 grains and 3.39" since that seating depth was better than 3.38" with 75.5 grains. Anyway it looks like this gun will shoot with lots of jump to the lands (0.260"). I guess a parallel throat will allow a rifle to shoot tight groups with lots of jump to the lands. Rufous.</p></blockquote><p></p>
[QUOTE="rufous, post: 24842, member: 122"] Thanks for the replies and suggestions. If I do lengthen the magazine box it would be from the back end. The guy who makes these boxes that Brownells sells would do the machining. He said he can give me about 0.2" more room. But it is looking like I may not need to. I was out shooting the Swift 180 Scirocco and trying deeper seating depths. That bullet is touching the lands at about 3.65" overall length. I tried a couple days ago a seating depth of 3.625, 3.59 and 3.35". At 3.35" and 76 grains of RL22 I got a 3 shot group of 1.14". Then today I tried 75.5 grains of RL22. A seating depth of 3.36" gave a group of 1.55". Seating depth of 3.37" gave 1.14" and seat depth of 3.38" gave a group of 0.79". Then a seat depth of 3.39" gave a group of 0.63". Finally I tried 75 grains with a seating depth of 3.38" and got a group of 0.43". So now I need to try 75 grains and 3.39" since that seating depth was better than 3.38" with 75.5 grains. Anyway it looks like this gun will shoot with lots of jump to the lands (0.260"). I guess a parallel throat will allow a rifle to shoot tight groups with lots of jump to the lands. Rufous. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
please advise re: seating depth
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