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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm wsm
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<blockquote data-quote="Capt RB" data-source="post: 1519011" data-attributes="member: 85987"><p>It can be a few things One a better seal from a well lapped bore will give a touch more speed. A tapered lap will give more speed and a tighter bore dia. can give this as well. I have a .298 4 groove in 308 that iss about 100fps faster than normal. I hit pressures with much lower charge weights. This is a combination of things including the chamber being from a non sammi spec.</p><p> Seeing as your below the book with pressure I would think your chamber is at least a minimum spec sammi chamber. Might even be in the throat design. Talk to your smith. Some will give you the information alot won't.</p></blockquote><p></p>
[QUOTE="Capt RB, post: 1519011, member: 85987"] It can be a few things One a better seal from a well lapped bore will give a touch more speed. A tapered lap will give more speed and a tighter bore dia. can give this as well. I have a .298 4 groove in 308 that iss about 100fps faster than normal. I hit pressures with much lower charge weights. This is a combination of things including the chamber being from a non sammi spec. Seeing as your below the book with pressure I would think your chamber is at least a minimum spec sammi chamber. Might even be in the throat design. Talk to your smith. Some will give you the information alot won't. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm wsm
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