Re: Anyone besides me using the MCR Meplat trimmer?
my,
I use a meplat trimmer made by HPitts here on the Hide. I first sort by ogive length, then trim. After trimming, I point them with a Whidden pointer. To remove the swarf left by pointing, the bullets are peened with small ball bearings in a vibratory tumbler either before or during the application any coating.
KT,
My understanding of the function of the center reamer is to make sure a small opening at the hollow point exists. The opening allows pressure equalization inside the hollow point jacket with forces on the unsupported part of the jacket. Don't know whether or not this is necessary, especially if you don't get too aggressive with pointing. I've seen other tools with this idea before, but no longer have the links and cannot say how long this idea has been around.
Results:
About 1/2 to 1 MOA decrease in elevation required for same POI. This equals an increase of MV of about 100f/s for most cartridges. You may do better by changing powders, primers, bullet jump or bullets.
The group size may shrink or may increase, depending upon the rilfe/ammo combination, consistency of work, and other factors.
Decrease in difference between COL and OGL in loaded rounds.
Summary:
You've got to do most everything else the BR folks do to increase consistency to obtain better group sizes.
If you cannot get a 50-100f/s increase out of your load by changing powder, primers, brass, etc, this might help.
HTH,
DocB