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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Tight neck chamber
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<blockquote data-quote="J E Custom" data-source="post: 1095096" data-attributes="member: 2736"><p>SAMME specs. normally require the ammo manufacture hold his max dimension to</p><p>.006 to .007 thousandths smaller than their maximum chamber dimension.</p><p></p><p>A good reamer manufacture will hold the SAMME dimensions and if you shoot factory ammo you will still be fine. But rarely will a factory chamber be SAMME spec. (it will normally be larger).</p><p></p><p>The minimum clearance between a loaded round should be .003 thousandths if it is turned. the normal clearance should be .004 thousandths with turned necks. you can go with less clearance</p><p>but pressure will appear early if everything is not perfect. on dangerous game it is recommended that this neck clearance be between .006 and .008 for chambering in poor conditions or life threatening circumstances.</p><p></p><p>So if you get a SAMME reamer and have it chambered by a good gunsmith it should be good to shoot most factory ammo. if you want to turn all of the necks on your brass, I recommend that you do a minimum turning then push the bullet you want to use in it, measure the od of the loaded round and add .004 thousandths to that and have a reamer made with that size neck.</p><p></p><p>To find out if your rifle has a SAMME neck, a loose neck or a tight neck simply measure the Od of several fired cases, subtract the neck thickness x2 and the bullet diameter and you will know how much clearance you have from a loaded round to your neck chamber.</p><p></p><p>Note ; these neck dimensions are very important if you want to avoid pressure issues.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1095096, member: 2736"] SAMME specs. normally require the ammo manufacture hold his max dimension to .006 to .007 thousandths smaller than their maximum chamber dimension. A good reamer manufacture will hold the SAMME dimensions and if you shoot factory ammo you will still be fine. But rarely will a factory chamber be SAMME spec. (it will normally be larger). The minimum clearance between a loaded round should be .003 thousandths if it is turned. the normal clearance should be .004 thousandths with turned necks. you can go with less clearance but pressure will appear early if everything is not perfect. on dangerous game it is recommended that this neck clearance be between .006 and .008 for chambering in poor conditions or life threatening circumstances. So if you get a SAMME reamer and have it chambered by a good gunsmith it should be good to shoot most factory ammo. if you want to turn all of the necks on your brass, I recommend that you do a minimum turning then push the bullet you want to use in it, measure the od of the loaded round and add .004 thousandths to that and have a reamer made with that size neck. To find out if your rifle has a SAMME neck, a loose neck or a tight neck simply measure the Od of several fired cases, subtract the neck thickness x2 and the bullet diameter and you will know how much clearance you have from a loaded round to your neck chamber. Note ; these neck dimensions are very important if you want to avoid pressure issues. J E CUSTOM [/QUOTE]
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Tight neck chamber
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