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338 rum rifle build?
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<blockquote data-quote="Long Time Long Ranger" data-source="post: 218459" data-attributes="member: 505"><p>I went down to the basement and sifted through some boxes of my old loads from several years back just to check my memory on this to make sure I had it right. I found loads on two 338 Lapua's with 26" barrels. The accuracy loads averaged 3476 with the 200 grain ballistic tip. Accuracy load was 106 grains of WMR and the bullet seated on the lands. The average of eleven 338-300 ultramags that I could find data on averaged 3358 fps with max accuracy loads and the 200 grain ballistic tip. This was with various powders but they all maxed right in there. The barrels on the ultras varied between 28"-30". The max loads on the Lapuas averaged about 2-4 grains more of the same powder. When I find data on other bullets I will put it in here. The Lapua, which is a shortenned 416 Rigby, fell right between the 338-300 ultramags and my full size 338-416 rigby's and 338-378 weatherby's.</p><p></p><p>Other interesting data I found was my little pet 358 ultramag shooting 225 grain ballistic tips at 3419 fps with a 7 fps extreme spread on a 5 shot group. The group was 3 6/8" at 650 yards. That is an elk killing machine. This is a hart barrel with 1-16 twist and the weatherby freebore in it which is probably the difference with the high velocity. </p><p></p><p>For comparison my pet 338 gibbs accuracy load shot the 200 ballistic tip at 3068 fps. This is all you can get out of a 30-06 case. This was with H-414 powder.</p><p></p><p>I have boxes of data on all kinds of wildcats I have done over 35 or so years. I need to get it all together in book form for easy access. I guess now retired and a shattered leg might be time to start that process.</p><p></p><p>I found my long range coyote load for my 240 gibbs shooting the 70 grain ballistic tip at 4226 fps and my 257 STW antelope killing load of 3987 fps with the 100 grain Barnes. This really got to be fun reading.</p></blockquote><p></p>
[QUOTE="Long Time Long Ranger, post: 218459, member: 505"] I went down to the basement and sifted through some boxes of my old loads from several years back just to check my memory on this to make sure I had it right. I found loads on two 338 Lapua's with 26" barrels. The accuracy loads averaged 3476 with the 200 grain ballistic tip. Accuracy load was 106 grains of WMR and the bullet seated on the lands. The average of eleven 338-300 ultramags that I could find data on averaged 3358 fps with max accuracy loads and the 200 grain ballistic tip. This was with various powders but they all maxed right in there. The barrels on the ultras varied between 28"-30". The max loads on the Lapuas averaged about 2-4 grains more of the same powder. When I find data on other bullets I will put it in here. The Lapua, which is a shortenned 416 Rigby, fell right between the 338-300 ultramags and my full size 338-416 rigby's and 338-378 weatherby's. Other interesting data I found was my little pet 358 ultramag shooting 225 grain ballistic tips at 3419 fps with a 7 fps extreme spread on a 5 shot group. The group was 3 6/8" at 650 yards. That is an elk killing machine. This is a hart barrel with 1-16 twist and the weatherby freebore in it which is probably the difference with the high velocity. For comparison my pet 338 gibbs accuracy load shot the 200 ballistic tip at 3068 fps. This is all you can get out of a 30-06 case. This was with H-414 powder. I have boxes of data on all kinds of wildcats I have done over 35 or so years. I need to get it all together in book form for easy access. I guess now retired and a shattered leg might be time to start that process. I found my long range coyote load for my 240 gibbs shooting the 70 grain ballistic tip at 4226 fps and my 257 STW antelope killing load of 3987 fps with the 100 grain Barnes. This really got to be fun reading. [/QUOTE]
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