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Join Date: Jun 2009
Location: Northern Berks County, PA
That isn't a major issue.
If you were going to notice that kind of small variation in brass in your accuracy, you wouldn't be using Rem brass. I don't mean that you shouldn't use RP brass, rather it's not "high end" brass. You'd see more impact on your groups by using premium brass with super consistent capacity/volume than you would be stressing over RP brass having 10/100 or so variance on the case length, which will disappear after the first firing anyway (most likely).
Plus, the 06 case headspaces on the shoulder, so the mouth position isn't a safety concern in this situation.
Do this...weigh 10 cases. See what your case weight variation is. I bet you see 5gr variance....or more. Maybe a lot more.
Get a concentricity gauge and measure the neck concentricity and I bet you see variance.
If you want the kind of consistency you're sort of hinting at, you need consistent case volume and neck concentricity as well, and I guarantee you the RP brass won't be stellar in either regard.
I also bet if you follow good reloading protocols, you can use that RP brass to produce very capable groups from your rifle.
One thing I can't recommend highly enough is to partial full length size your brass. Fire it once, then when you resize, set your sizer to barely push the shoulder back enough to chamber the case. I can give you more specific instruction that if you need it.
When you do that, your cases won't have to stretch much on each firing. You'll trim very infrequently, and your brass will last about forever if you anneal every few load cycles. If you really wanna make that brass sing, you could get a neck turner and turn the necks for super consistent neck thickness (meaning consistent neck tension), get a carbide sizer button for your die, and weight sort that brass so you are working with very, very consistent components.
But to what effect? You'll spend a lot of time and money, and if you produce 1.5" groups at 100 with that brass (VERY doable), and you reduce it to 0.75", does it matter?
Only you can answer that question.