I never stop learning----This weeks lesson herein

[Old Rooster]

Last night I finished checking several boxes of loaded ammo and found something interesting.
When using regular dies I have runout up to .006 and as little as .001 but using the RCBS Match Master dies I only found 1 load with a tad over .001, I think it is because you put the bullet in the die on top and it loads the bullet into the case and seats it. Possibly the bullet I have been putting in the case under the die is not as straight as the Match Master dies puts the bullet! I had 1 bullet slightly over .001.
I use the Hornady concentricity gauge and straightener and found other loaded ammo is much straighter after using the straightener. I could only get a few to .000 and will wait until I get to the range to test the loads.

 

[FireFlyFishing]

Last night I finished checking several boxes of loaded ammo and found something interesting.
When using regular dies I have runout up to .006 and as little as .001 but using the RCBS Match Master dies I only found 1 load with a tad over .001, I think it is because you put the bullet in the die on top and it loads the bullet into the case and seats it. Possibly the bullet I have been putting in the case under the die is not as straight as the Match Master dies puts the bullet! I had 1 bullet slightly over .001.
I use the Hornady concentricity gauge and straightener and found other loaded ammo is much straighter after using the straightener. I could only get a few to .000 and will wait until I get to the range to test the loads.

Agreed on the match master dies. They just work.

 

[Bang4theBuck]

I have an update! And It's a good one. I sized the brass carefully and rotated it a couple partial rotations in the full length sizing process. I also lubed the inside of the necks, and then when seating the bullets, I rotated the round aprox 120 deg each time. My runout e ded uo being between .001" and .0015"across all of the rounds I shot. In ever charge weight the groups were better. My best group last week was 1.35" woth an average about about 1.6". Today, my best group was .40" and my average was .075". This is all with a totally factory Browning A-bolt Medallion (1986 model), with a 5lb trigger.

Im a happy guy! And I learned something.

 

[Mike Matteson]

I am already in that rabbit hole. I might run into you down there.

Me too!

 

[Mike Matteson]

I got the RCBS. If I were to buy it again, I would probably get the Sinclair. That's just due to it having rollers bearings instead of a V slot to roll the round in.

Ineresting!

 

[MarkInPA]

I have an update! And It's a good one. I sized the brass carefully and rotated it a couple partial rotations in the full length sizing process. I also lubed the inside of the necks, and then when seating the bullets, I rotated the round aprox 120 deg each time. My runout e ded uo being between .001" and .0015"across all of the rounds I shot. In ever charge weight the groups were better. My best group last week was 1.35" woth an average about about 1.6". Today, my best group was .40" and my average was .075". This is all with a totally factory Browning A-bolt Medallion (1986 model), with a 5lb trigger.

Im a happy guy! And I learned something.

Good job. Glad to hear it. I'm already reloading fairly concentric ammo but, maybe I'll have to give this twist method a try.

Five pound trigger? Is that for real?

 

[Bang4theBuck]

Yep....my biggest criticism of browni g along with short mags, and long throats (just my limited experience).