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Long Range Hunting & Shooting
Large .338s... potential accuracy?
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<blockquote data-quote="Long Time Long Ranger" data-source="post: 401707" data-attributes="member: 505"><p>You can build the excalibur or 300 pegasus on any mk5 action from 257 wby up. If you like the most in a beltless big 338 it has the most powder capacity. The improved 338-416 rigby with the shoulder pushed forward is virtually the same capacity and would save you a little on brass. I have seen them and 338-378 imp's push 300 smk's easily over 3100 fps and some into the 3200's. They are the fastest before going up to the chey-tac case. In the big 338's in a hunting weight rifle you really have two popular classes. The lapua and ultramag class that push the 300 smk 2750-2850 fps and then the huge imp 378 wby and 416 rigby cases that can push the 300 smk 3100-3200 fps. The excalibur is similar to the big blown out rigby case. A couple more grains of powder. They are all very accurate if done by a gunsmith familiar with the chambering. None in either class would be more accurate than the other. I have seen the imp 378 and rigby cases shoot incredible groups beyond a mile. If you are into extreme long range these are THE rifles to have. The standard lapua and ultramag stuff get left behind at the longer ranges because of the wind guestimation and you just flat run out of clicks. 200-300 fps makes quite a bit of difference. If I was going with a custom long range 338 these are the ones I would go with. Not saying all my lapuas and 338-300 ultras are not good ones because I love to shoot them all. But when the shooting gets long I always shoot my really big 338's.</p></blockquote><p></p>
[QUOTE="Long Time Long Ranger, post: 401707, member: 505"] You can build the excalibur or 300 pegasus on any mk5 action from 257 wby up. If you like the most in a beltless big 338 it has the most powder capacity. The improved 338-416 rigby with the shoulder pushed forward is virtually the same capacity and would save you a little on brass. I have seen them and 338-378 imp's push 300 smk's easily over 3100 fps and some into the 3200's. They are the fastest before going up to the chey-tac case. In the big 338's in a hunting weight rifle you really have two popular classes. The lapua and ultramag class that push the 300 smk 2750-2850 fps and then the huge imp 378 wby and 416 rigby cases that can push the 300 smk 3100-3200 fps. The excalibur is similar to the big blown out rigby case. A couple more grains of powder. They are all very accurate if done by a gunsmith familiar with the chambering. None in either class would be more accurate than the other. I have seen the imp 378 and rigby cases shoot incredible groups beyond a mile. If you are into extreme long range these are THE rifles to have. The standard lapua and ultramag stuff get left behind at the longer ranges because of the wind guestimation and you just flat run out of clicks. 200-300 fps makes quite a bit of difference. If I was going with a custom long range 338 these are the ones I would go with. Not saying all my lapuas and 338-300 ultras are not good ones because I love to shoot them all. But when the shooting gets long I always shoot my really big 338's. [/QUOTE]
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Large .338s... potential accuracy?
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