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Hunting
The Basics, Starting Out
bolt lug contact
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<blockquote data-quote="Fiftydriver" data-source="post: 91023" data-attributes="member: 10"><p>Harv,</p><p></p><p>Really depends on how heavy you load the 270 Win. Neck sizing only works great for accuracy but if you load to top levels you will quickly need to bump the shoulder to maintain easy chambering. You can let that be your judge on when to bump the shoulder.</p><p></p><p>Do some testing and see if the rifle shoots better with neck sized only or partial Full Length sized cases. Despite conventional wisdom, many factory rifles shoot more consistantly with partially full length sized cases because they are not baring evenly on the bolt lugs.</p><p></p><p>If the bolt lug baring surface is not square, generally a preload on the bolt will cause unexplained fliers at times. This Bolt preload can be caused by only neck sizing so test her out and see how your rifle responds. Your lugs look relatively even but its impossible to tell if they are square without putting a mic to them.</p><p></p><p>From what I have seen with the Tikka rifles, the most limiting factor to accuracy is their synthetic stocks, very flexible in the receiver area.</p><p></p><p>If you get a load in the 1/2" range I would say you have done very well and to stick with that.</p><p></p><p>Again, test the neck sizing only against the partially FL sized cases and see if there is any accuracy difference. If you decide to neck size only, it is imparative to keep those lug surfaces lubed with quality lube as there will be more force applied to them when the bolt is closed. Keep them clean as well!!</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 91023, member: 10"] Harv, Really depends on how heavy you load the 270 Win. Neck sizing only works great for accuracy but if you load to top levels you will quickly need to bump the shoulder to maintain easy chambering. You can let that be your judge on when to bump the shoulder. Do some testing and see if the rifle shoots better with neck sized only or partial Full Length sized cases. Despite conventional wisdom, many factory rifles shoot more consistantly with partially full length sized cases because they are not baring evenly on the bolt lugs. If the bolt lug baring surface is not square, generally a preload on the bolt will cause unexplained fliers at times. This Bolt preload can be caused by only neck sizing so test her out and see how your rifle responds. Your lugs look relatively even but its impossible to tell if they are square without putting a mic to them. From what I have seen with the Tikka rifles, the most limiting factor to accuracy is their synthetic stocks, very flexible in the receiver area. If you get a load in the 1/2" range I would say you have done very well and to stick with that. Again, test the neck sizing only against the partially FL sized cases and see if there is any accuracy difference. If you decide to neck size only, it is imparative to keep those lug surfaces lubed with quality lube as there will be more force applied to them when the bolt is closed. Keep them clean as well!! Good Shooting!! Kirby Allen(50) [/QUOTE]
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The Basics, Starting Out
bolt lug contact
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