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Reloading and Tuning my 16" AR-10

FLIGHT762
So, with your comparator distance setting case shoulders @ 1.620", how does that compare to the SAAMI minimum of 308 Win @ 1.630?

What comparator are you using?

Most Comparators will NOT give you a proper SAAMI distance reading. I have 3 different Comparators. Hornady, Sinclair and Derrico. When I take a 1.630" SAAMI minimum headspace gauge and measured them in my Comparators, I get 3 different measurements.

With the Hornady, I get 1.622", the Derrico is 1.628" and the Sinclair number is way off.

So, those individual numbers are equal the 1.630" SAAMI minimum.

I use those numbers to know where SAAMI minimum is. I then can set my resized brass shoulders to where I want them.

I have a number of 308 Win. rifles. AR 10's and bolt guns. In all of my rifles, none have a fired brass lengths go past 1.634".

For me, I can set my F/L die to resize case shoulders to the SAAMI minimum (1.630") and then be able to use that resized brass in ANY of my 308 rifles without oversizing.

There are only a couple of Comparator manufacturers that have their comparators machined to match the 1.630" distance.


There are two manufacturers of case shoulder measuring tools that are called "Mics" that do measure SAAMI minimum, the RCBS Precision Mic and the Whidden Mic are set to their "0" setting to be calibrated @ 1.630". I do have a RCBS Precision Mic in 308 Win. and when I have apiece of brass resized to the "0" mic setting it is at the 1.630" minimum distance.
When I take that piece of brass and measure the shoulder with the Hornady comparator, I get 1.622" and in the Derrico, I get 1.628".

So, my question to you is that 1.620" measurement you're getting with your comparator, how does that measurement relate to the actual SAAMI 1.630" minimum measurement?

If you're actually bumping your case shoulders .010" below minimum (1.620"), you are way oversizing your brass and you will be getting case head separations.

I haven't found the need to shoulder bump shorter than SAAMI minimum, even in my two 308 Win. M-1A's.

Many new reloaders get confused with comparator numbers and try to compare and relate those numbers to actual SAAMI numbers.

I'm curious as to how you determined to set you shoulders to your 1.620" measurement.
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Reduced Recoil?

King_beardsly
hermosabeach said:
300 win mag and up have a stout recoil from the bench.

Since you hunt, have you used shooting sticks and shot the rifle standing?

When standing it's easier for you to move with the gun.

Shooting .338 win mag from the bench in my hunting rifle (no brake) is a lot.

Standing it's not too bad.


For bench, as others said, add weight.

Add a rail and 4-14 pounds of brass weights to the rail under the gun.
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4-14lbs… I like your style
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MPA Rifle rings or one peice scope mount?

Emerson0311
Rodney65 said:
Sorry old thread but I saw this comment and was just wondering why higher is the trend? If you aren't mounting a clip on thermal or NV what does mounting the scope higher do for you?

Personally for ergonomics I find after the cheek piece is adjusted having my head a 1/2" higher above my firing hand makes no difference. I have always tried to get the lowest rings possible but maybe I'm doing it wrong.
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A more vertical head position with a “chin weld” is more comfortable and repeatable, especially once a shooter moves to a position more square behind the rifle, rather than bladed sideways like we were taught because all our precision shooting instructors used loop slings. It means your head position more similar across all shooting positions. It also means once the rifle butt moves toward the Center of your body, along with a proper butt that is behind the action, recoil moves the rifle back but not to the sides. This means you can spot your hit, or miss, and adjust more quickly. Most of us Gen X’ers learned shooting techniques from the early 1900’s.
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Ukraine war Bullshit.

Emerson0311
375fan said:
The flyover was a bad idea and fucking waste of taxpayer money and resources. Putin is fully aware of what our advanced aircraft are capable of doing. Trying to bully or intimidate him is just plain fucking stupid. What should be going on from the start is Trump having serious conversation with Putin about how to end the bs war.
Hillary and her red button :rolleyes: she liked to talk tough, showed just how out of her league she really is/was.
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That shit was not for Putin. He, like every truly powerful man, is well above that crap. The flyover was for media purposes to give chubbies to the mental midgets that approach politics like pro sport’s rivalries. It’s all bullshit. Until the problem children end up still and steaming in a ditch, all this theatre represents zero reality.
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