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Hunting
The Basics, Starting Out
Custom hunting .30-378
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<blockquote data-quote="J E Custom" data-source="post: 259850" data-attributes="member: 2736"><p>First of all I think the Weatherby Mark 5 is one of the strongest actions made. !!!!</p><p></p><p>A while back White laboratories tested all of the commercial actions to destruction (Blew </p><p>them up) and the only action that they couldn't blow up was the MK 5. (when I find </p><p>this test results report I will post it).</p><p></p><p>Next the accuracy issue. The type of action has very little to do with accuracy if it is</p><p>installed with minium tolerances and precision.</p><p></p><p>And as far as freebore it does not hurt accuracy if the chamber is concentric and head </p><p>space is .001 or less. also it allows hotter loads (Higher velocity) with less pressure.</p><p></p><p>If you take a Weatherby factory load and try to use it in a non throated 30/378 it will</p><p>probably blow the primer because it will be to hot forcing you to load down losing velocity.</p><p></p><p>I have a 30/378 built on a # 7 taper shillen target select with a standard throat that will/</p><p>has shot a .092 (less than 1/10 of an inch) 5 shot group and is built on a Weatherby Mark</p><p>5 action using a 200gr nozzler partition .</p><p></p><p>Also I once had (wish I still did) an accumark in 30/378 that would shoot 1/4 MOA groups</p><p>(.174,.198 and .219 with different loads) so the rifle more than exceeded Weatherbys </p><p>specs.</p><p></p><p>As far as I'm concerned It is the only fractory action that is suitable and strong enough</p><p>for the 30/378.</p><p></p><p>The Mk 5 actions are well machined,stronge and have good triggers, plus they look good.</p><p></p><p>A custom action would be the only other option for the big 30/378.</p><p></p><p>Just my 2 cents based on lots of experience with Mark 5 actions.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 259850, member: 2736"] First of all I think the Weatherby Mark 5 is one of the strongest actions made. !!!! A while back White laboratories tested all of the commercial actions to destruction (Blew them up) and the only action that they couldn't blow up was the MK 5. (when I find this test results report I will post it). Next the accuracy issue. The type of action has very little to do with accuracy if it is installed with minium tolerances and precision. And as far as freebore it does not hurt accuracy if the chamber is concentric and head space is .001 or less. also it allows hotter loads (Higher velocity) with less pressure. If you take a Weatherby factory load and try to use it in a non throated 30/378 it will probably blow the primer because it will be to hot forcing you to load down losing velocity. I have a 30/378 built on a # 7 taper shillen target select with a standard throat that will/ has shot a .092 (less than 1/10 of an inch) 5 shot group and is built on a Weatherby Mark 5 action using a 200gr nozzler partition . Also I once had (wish I still did) an accumark in 30/378 that would shoot 1/4 MOA groups (.174,.198 and .219 with different loads) so the rifle more than exceeded Weatherbys specs. As far as I'm concerned It is the only fractory action that is suitable and strong enough for the 30/378. The Mk 5 actions are well machined,stronge and have good triggers, plus they look good. A custom action would be the only other option for the big 30/378. Just my 2 cents based on lots of experience with Mark 5 actions. J E CUSTOM [/QUOTE]
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Custom hunting .30-378
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