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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm-300 Norma Improved?
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<blockquote data-quote="highdrum" data-source="post: 1747386" data-attributes="member: 13732"><p>My piercision 300nmi will push bullets of equal weight 125-150 fps faster than the 30 nosler. ADG 28 NOS brass has 103gr capacity. Stepping down a caliber and going more overbore w/o increasing barrel length decreases the efficiency of your increased capacity, more than likely RL33, N570, H50BMG, maybe US869 will be best powders. The barrel life will be short as you'll be almost identical to 7mm rum charges, but it's your choice. 195 Bergers get explosive at extreme speeds, maybe he's banking on the new 190 a tip. Slowing your twist to 8.5 may be an idea since you'll be getting 3300 fps or so. Maybe he hasn't gotten a Rigby faced action yet and is just casting bets for input on his build? I'm just adding an opinion of practicality with the setup. My new 7mm will be a Sherman max, which only holds 78gr capacity, with charges around 70gr N570 pushes a 195 close to 3000 fps from a 26" barrel, 30% less powder for 10% less speed. My only reasoning for my post. I'm out of this conversation.</p></blockquote><p></p>
[QUOTE="highdrum, post: 1747386, member: 13732"] My piercision 300nmi will push bullets of equal weight 125-150 fps faster than the 30 nosler. ADG 28 NOS brass has 103gr capacity. Stepping down a caliber and going more overbore w/o increasing barrel length decreases the efficiency of your increased capacity, more than likely RL33, N570, H50BMG, maybe US869 will be best powders. The barrel life will be short as you'll be almost identical to 7mm rum charges, but it's your choice. 195 Bergers get explosive at extreme speeds, maybe he's banking on the new 190 a tip. Slowing your twist to 8.5 may be an idea since you'll be getting 3300 fps or so. Maybe he hasn't gotten a Rigby faced action yet and is just casting bets for input on his build? I'm just adding an opinion of practicality with the setup. My new 7mm will be a Sherman max, which only holds 78gr capacity, with charges around 70gr N570 pushes a 195 close to 3000 fps from a 26" barrel, 30% less powder for 10% less speed. My only reasoning for my post. I'm out of this conversation. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm-300 Norma Improved?
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