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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Anyone deal w/700 Rem w/long throat? New gun, not shot out. Rem do this on purpose?
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<blockquote data-quote="J E Custom" data-source="post: 845862" data-attributes="member: 2736"><p><strong>Re: Anyone deal w/700 Rem w/long throat? New gun, not shot out. Rem do this on purpo</strong></p><p></p><p></p><p></p><p></p><p>We brought a lot of this on ourselves because we wanted "More Velocity" So in order to stay with the market trends Almost all of the newer cartridges have more free bore. So they boosted the pressure from 55,000 average to 65,000 PSI. In order to do this they had to add more free bore.</p><p></p><p>All of the WSMs, SAUMs, RUMs have At least .200 thousandths free bore or more.</p><p></p><p>When Winchester came out with there 270 Average pressures went from 46,000 - 52,000 to</p><p>over 55,000 so they increased the free bore to manage pressures and limited the mag length </p><p>to prevent loads that could reach the lands making pressures exceed max.</p><p></p><p>Roy figured this out and decided to make all of his rifles with lots of free bore in order to gain velocity</p><p>over everyone else. Because Velocity sells.</p><p></p><p>To address the accuracy issue there are a few different rules to get the desired accuracy from a</p><p>belted case with lots of free bore.</p><p></p><p>1= The chamber must be perfectly aligned with the bore centerline. </p><p>2= The action and bolt must also be square and on the same centerline as the chamber and bore.</p><p>3= Head space with a belted case should be the minimum (Just enough to close the bolt) If there is</p><p>more than .001 or .002 thousandths head space the need to fire form becomes very important.</p><p>4= Once the case has been fire formed, sizing correctly is the secret to accuracy (Only size enough to close the bolt "No More") . when you size to the minimum you are essentially shooting a shouldered case because it is head spacing on the shoulder and with Zero head space the case fits the chamber </p><p>perfectly and is aligned perfectly with the bore. The bullet will still be held centered by the case even </p><p>after it reaches the lands and starts to engrave.</p><p></p><p>Back in the day we had to seat the bullets where they touched the lands in order to make up for the</p><p>quality of chambers, Reamers, brass, bullets and in general, workman ship. Now with all of the improvements in all of the above, It is easy to achieve outstanding accuracy.</p><p></p><p>1/2 MOA groups are a starting point now days with these cartridges and Sub 1/10 th MOA groups are possible and not to uncommon.</p><p></p><p>The 270 Winchester is a fine old cartridge and very capable of 1/2 MOA @ 600 yards. especially now days.</p><p></p><p>Sorry for the long post.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 845862, member: 2736"] [b]Re: Anyone deal w/700 Rem w/long throat? New gun, not shot out. Rem do this on purpo[/b] We brought a lot of this on ourselves because we wanted "More Velocity" So in order to stay with the market trends Almost all of the newer cartridges have more free bore. So they boosted the pressure from 55,000 average to 65,000 PSI. In order to do this they had to add more free bore. All of the WSMs, SAUMs, RUMs have At least .200 thousandths free bore or more. When Winchester came out with there 270 Average pressures went from 46,000 - 52,000 to over 55,000 so they increased the free bore to manage pressures and limited the mag length to prevent loads that could reach the lands making pressures exceed max. Roy figured this out and decided to make all of his rifles with lots of free bore in order to gain velocity over everyone else. Because Velocity sells. To address the accuracy issue there are a few different rules to get the desired accuracy from a belted case with lots of free bore. 1= The chamber must be perfectly aligned with the bore centerline. 2= The action and bolt must also be square and on the same centerline as the chamber and bore. 3= Head space with a belted case should be the minimum (Just enough to close the bolt) If there is more than .001 or .002 thousandths head space the need to fire form becomes very important. 4= Once the case has been fire formed, sizing correctly is the secret to accuracy (Only size enough to close the bolt "No More") . when you size to the minimum you are essentially shooting a shouldered case because it is head spacing on the shoulder and with Zero head space the case fits the chamber perfectly and is aligned perfectly with the bore. The bullet will still be held centered by the case even after it reaches the lands and starts to engrave. Back in the day we had to seat the bullets where they touched the lands in order to make up for the quality of chambers, Reamers, brass, bullets and in general, workman ship. Now with all of the improvements in all of the above, It is easy to achieve outstanding accuracy. 1/2 MOA groups are a starting point now days with these cartridges and Sub 1/10 th MOA groups are possible and not to uncommon. The 270 Winchester is a fine old cartridge and very capable of 1/2 MOA @ 600 yards. especially now days. Sorry for the long post. J E CUSTOM [/QUOTE]
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Anyone deal w/700 Rem w/long throat? New gun, not shot out. Rem do this on purpose?
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