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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
solid copper bullet performance
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<blockquote data-quote="MontanaRifleman" data-source="post: 859103" data-attributes="member: 11717"><p>Steve,</p><p></p><p>In a nitrided 27" 300 RUM barrel with RL33, I'm expecting close to 3200 fps with the 230's. In my old 26" Sendero barrel, I was getting a little shy of 3500 fps with the 177's with both Retumbo and RL17, however the RL17 load was less than 90% capacity. I'm thinking the nitrided barrel might be a little friendlier to RL17 and the 177's and might see 3600 fps or so. I'm also a little skeptical of the BC claim for the 177. I think it's probably in the mid to upper .5 range and time should tell on that soon.</p><p></p><p>If I use .6 and 3600 fps for the 177's and .74 and 3200 fps for the 230's, the 230's catch the 177's in velocity @ 1300 yds with 53 gr more mass. At 1K the 230's have a 400 ftlb of KE advantage over the 177's and even better relative momentum advantage. The 230's take the windage advantage from the get go although it is close through out with a 10 mph corrrection of 5 MOA for the 230's vs 5.6 MOA for the 177's @ 1300 yds.</p><p></p><p>The 230 Hybrids are going to be hard to beat in the 30 cal down range. In fact they are the best LR bullet ballistically in the 30 cal. If accuracy is equal between the 2 I have to go with the 230's. The only possible advantage the 177's would have is closer range penetration through muscle and bone and in that case, the 200 gr CEB's would be at least equal and probably better than the 177's.</p><p></p><p>Back when the 210 VLD's were king of the heap so to speak, the 177's would have given them a lot better competition. The 1600 fps opening velocity is a big plus when it comes to deer size game, but not sure how much advantage it is in trying to use a 177 gr bullet on elk size game at those lower velocities.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 859103, member: 11717"] Steve, In a nitrided 27" 300 RUM barrel with RL33, I'm expecting close to 3200 fps with the 230's. In my old 26" Sendero barrel, I was getting a little shy of 3500 fps with the 177's with both Retumbo and RL17, however the RL17 load was less than 90% capacity. I'm thinking the nitrided barrel might be a little friendlier to RL17 and the 177's and might see 3600 fps or so. I'm also a little skeptical of the BC claim for the 177. I think it's probably in the mid to upper .5 range and time should tell on that soon. If I use .6 and 3600 fps for the 177's and .74 and 3200 fps for the 230's, the 230's catch the 177's in velocity @ 1300 yds with 53 gr more mass. At 1K the 230's have a 400 ftlb of KE advantage over the 177's and even better relative momentum advantage. The 230's take the windage advantage from the get go although it is close through out with a 10 mph corrrection of 5 MOA for the 230's vs 5.6 MOA for the 177's @ 1300 yds. The 230 Hybrids are going to be hard to beat in the 30 cal down range. In fact they are the best LR bullet ballistically in the 30 cal. If accuracy is equal between the 2 I have to go with the 230's. The only possible advantage the 177's would have is closer range penetration through muscle and bone and in that case, the 200 gr CEB's would be at least equal and probably better than the 177's. Back when the 210 VLD's were king of the heap so to speak, the 177's would have given them a lot better competition. The 1600 fps opening velocity is a big plus when it comes to deer size game, but not sure how much advantage it is in trying to use a 177 gr bullet on elk size game at those lower velocities. [/QUOTE]
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