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Hunting
The Basics, Starting Out
Chamber specs
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<blockquote data-quote="davchr" data-source="post: 2058919" data-attributes="member: 116660"><p>Having done some varmint hunting with .223's and a .243 I am looking to buy a 7mm Rem Mag long range rifle for deer and elk in Arizona.</p><p></p><p>So, I ordered a new Remington 700 long range. Before taking possession I measured the throat depth (actually the ogive distance from the case head to the bullet ogive). It appeared to be WAY too long as the bullet cannelure was about .210" beyond the end of the case neck. (Hornady 162 gr SST bullet) I rejected the gun and ordered a Browning X-Bolt Long Range. Measured the throat depth on this gun. This time the bullet cannelure was "only" .142" beyond the case neck. I rejected that gun as well. The C.O.L. was 3.400".</p><p></p><p>I looked up the SAAMI specs for the 7mm Rem Mag chamber. They have a reference dimension of 2.7256" from the bolt face to the end of the throat. The Browning measurement gave me 2.767" from the head of the cartridge case to the ogive of the bullet or about .041" over what I think SAAMI says. If the chamber was in spec the bullet cannelure would be ~.100" beyond the end of the case neck.</p><p></p><p>I have several questions:</p><p>1. Is there something wrong with my assumption that the cannelure should be near the end of the case neck when the bullet ogive is at the lands? Not > .100" off? (I am a retired mechanical engineer, and have spent a LOT of time in machine shops making parts, molds, and prototypes so I am pretty sure my measurements are close.)</p><p>2. Should I be rejecting these rifles? Or is that all that can be expected from production rifles?</p><p></p><p>Any insight here would be appreciated.</p><p></p><p>thanks,</p><p>Dave Christensen</p></blockquote><p></p>
[QUOTE="davchr, post: 2058919, member: 116660"] Having done some varmint hunting with .223's and a .243 I am looking to buy a 7mm Rem Mag long range rifle for deer and elk in Arizona. So, I ordered a new Remington 700 long range. Before taking possession I measured the throat depth (actually the ogive distance from the case head to the bullet ogive). It appeared to be WAY too long as the bullet cannelure was about .210" beyond the end of the case neck. (Hornady 162 gr SST bullet) I rejected the gun and ordered a Browning X-Bolt Long Range. Measured the throat depth on this gun. This time the bullet cannelure was "only" .142" beyond the case neck. I rejected that gun as well. The C.O.L. was 3.400". I looked up the SAAMI specs for the 7mm Rem Mag chamber. They have a reference dimension of 2.7256" from the bolt face to the end of the throat. The Browning measurement gave me 2.767" from the head of the cartridge case to the ogive of the bullet or about .041" over what I think SAAMI says. If the chamber was in spec the bullet cannelure would be ~.100" beyond the end of the case neck. I have several questions: 1. Is there something wrong with my assumption that the cannelure should be near the end of the case neck when the bullet ogive is at the lands? Not > .100" off? (I am a retired mechanical engineer, and have spent a LOT of time in machine shops making parts, molds, and prototypes so I am pretty sure my measurements are close.) 2. Should I be rejecting these rifles? Or is that all that can be expected from production rifles? Any insight here would be appreciated. thanks, Dave Christensen [/QUOTE]
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