First time measuring chamber in 300 win mag. Got these numbers now what I do next.
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First time measuring chamber in 300 win mag. Got these numbers now what I do next.
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What do those numbers represent?
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Length of bullet I used with hornady coal.
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Ok, so 3.340” is the maximum coal for the 300winmag. The other numbers are from rounds that you loaded? What bullet are you using?
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Yes 208 eld match
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You need to measure your magazine and see what the maximum length that it will allow. Ideally you should measure the chamber/throat of your rifle and see what the maximum your rifle chamber will allow with that bullet. A lot of times the throat of in a barrel is cut to where it will allow longer, than what the book says, maximum length.
You can do all that and determine your own “load to” length, or you can adjust your die out a little and load to what the book says is maximum. If you take the second route, you need to make sure the round fits your chamber, at that length, and that the bullet is not contacting the rifling, before you shoot any.
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Measuring the coal for that rifle. You can take an empty case (no primer - no powder) seat a bullet out. Drop in chamber and slowly close bolt pushing round into chamber. When the bullet hits the lands it will be pushed back into the case. Close the bolt then slowly extract the round. You can then measure from case head to the scratches on the bullet where it hit the lands. Now you know the distance. Reduce that number by .002" or .003". Check and make sure it will fit the magazine. Now this measurement will only work for those particular bullets. Ogives change on bullets so if you changed bullets back to the process.
I'm gonna go thru the same process on my 6.5cm today. I have the Hornady OAL gauge, modified case and ogive adapter for my calipers.
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That tool makes it so much easier to to find your max OAL.Originally Posted by Cowcatcher
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