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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 Norma vs 300 Norma Imp
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<blockquote data-quote="LeddSlinger" data-source="post: 2280396" data-attributes="member: 65338"><p>I have built two different 300 NMIs and have components to build my third NMI. Made some tweaks on the chamber design this time around so just waiting on my reamer from JGS to get it done.</p><p></p><p>The NMI is a very impressive round. I am running the 220gr Berger up around 3200 fps from a 26" barrel using N570. The standard 300 Norma could never achieve that. I am currently using Lapua brass and case life is excellent. Another guy I shoot with occasionally built a big ELR rifle in the 300 NMI with a 34" barrel and can push the Berger 245gr up over 3250 fps.</p><p></p><p>Also picked up 300 Norma brass from ADG to test in my third rifle when it's complete.</p><p></p><p>For fireforming you just load close to max data for the standard 300 Norma and shoot. Max load on the standard 300 Norma is a mild load for the NMI.</p><p></p><p>Very easy to find good accuracy and N570 is an excellent powder for bullets from the Berger 215gr all the way up to Berger 245gr. Amazingly consistent across a wide range of temperatures and weather conditions and shoots very little vertical at long range. There are many others that use N570 besides myself in the NMI with the same results.</p><p></p><p>The 215, 220, and 230 work very well with about .235" freebore (+/-.010" fb) and a CFE-12 box.</p><p>Your reamer will have to have extra freebore if you want to shoot the 245 and not crowd the case capacity. And the 245 is better suited for a CFE-9 magazine due to its longer OAL.</p><p></p><p>If you want to use a M5 magazine bottom metal, the CIP+ from Hawkins with the long Lapua mags from Accurate Mags will accommodate most bullets and freebore but maybe a little tight for the 245gr.</p></blockquote><p></p>
[QUOTE="LeddSlinger, post: 2280396, member: 65338"] I have built two different 300 NMIs and have components to build my third NMI. Made some tweaks on the chamber design this time around so just waiting on my reamer from JGS to get it done. The NMI is a very impressive round. I am running the 220gr Berger up around 3200 fps from a 26” barrel using N570. The standard 300 Norma could never achieve that. I am currently using Lapua brass and case life is excellent. Another guy I shoot with occasionally built a big ELR rifle in the 300 NMI with a 34” barrel and can push the Berger 245gr up over 3250 fps. Also picked up 300 Norma brass from ADG to test in my third rifle when it’s complete. For fireforming you just load close to max data for the standard 300 Norma and shoot. Max load on the standard 300 Norma is a mild load for the NMI. Very easy to find good accuracy and N570 is an excellent powder for bullets from the Berger 215gr all the way up to Berger 245gr. Amazingly consistent across a wide range of temperatures and weather conditions and shoots very little vertical at long range. There are many others that use N570 besides myself in the NMI with the same results. The 215, 220, and 230 work very well with about .235” freebore (+/-.010” fb) and a CFE-12 box. Your reamer will have to have extra freebore if you want to shoot the 245 and not crowd the case capacity. And the 245 is better suited for a CFE-9 magazine due to its longer OAL. If you want to use a M5 magazine bottom metal, the CIP+ from Hawkins with the long Lapua mags from Accurate Mags will accommodate most bullets and freebore but maybe a little tight for the 245gr. [/QUOTE]
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300 Norma vs 300 Norma Imp
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