Re: Die recommendations and tips for 7.62x53R
26From the range..
The M28/76 slugged lands at about .300 and grooves at about .309. My thought on the the better fit is based on how the rifle shot. Both rounds went downrange. When I was sighting in either Lapua it just appeared to be a bit tighter as the group moved toward the center. The PPU while not bad was higher and shot more left to right. I did manage to get the PPU on target as well. Here’s a pic of my progression with the Lapua first shot is on the left lower off the target and the next four on the target as I incrementally clicked the sights. I changed the elevation a bit and it was near center vertical so I countinued tuning the sight until I started to hit red. Soon after switched to the PPU and the spread got wider and higher the target was at 50 yards. I did try the PPU at 100 and did end with one in the red, but it just seemed like it didn’t shoot as consistently even with my bad eyes.Marlene wrote: Tue Mar 05, 2019 6:47 pm Tell us what the slugged groove diameter of the barrel is. “Better fit” assumes a lot.
Slightly over .308 (top pic on measure).
Ok, check if my though is sort of right using Lapua bullets.Marlene wrote: Tue Mar 05, 2019 10:05 pm .309 groove diameter is loose for a target gun that's supposed to shoot .308 bullets, but being a bit tight for .310 bullets probably shoots them quite well.
Lapua ammo is so much better than PPU that the comparison speaks only of the comparison between ammo and not bullet sizes.
A rule of thumb would be groove dimension plus .001?Marlene wrote: Wed Mar 06, 2019 1:23 pm I’m suggesting that you load the D166 bullets in to either brass with 7.62x54r dies. I’m also saying that loading.308 bullets in either case will probably work with the same dies.
My understanding is that the only difference between the 53r and 54r specs is bullet diameter and trim length. Someone please confirm that I am correct on this?
That is correct from everything I've read as well. VV load data has them listed as the same for their load data, and the measurements between the two (illustrations anyway) are the same. Trim to length on the 53r is 2.098" vs the 54r being 2.105"Marlene wrote: Wed Mar 06, 2019 1:23 pm I’m suggesting that you load the D166 bullets in to either brass with 7.62x54r dies. I’m also saying that loading.308 bullets in either case will probably work with the same dies.
My understanding is that the only difference between the 53r and 54r specs is bullet diameter and trim length. Someone please confirm that I am correct on this?
Thanks. Trying to learn.Marlene wrote: Thu Mar 07, 2019 9:09 am Two die set with both expanders would be my first choice.
Rule of thumb is bullet diameter matches groove diameter. The rule of thumb does not cover all situations.
I have a book like this..
Ok.Marlene wrote: Thu Mar 07, 2019 12:08 pm Read everything in that book except the actual load data cover-to-cover twice. Then, refer back to it as you start loading and learning more. Data can come from other places, but the non-data parts of the book are really important for you to learn.
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