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If you have a caliper you don't need a special tool. Take a .223 Rem. case and trim it to make sure it's square, then measure it's length. Insert a .22 LR round into the .223 case and measure it again. Subtract the case length. The difference is the rim thickness.
the way i look at it is.. sorting does not make your ammo more accurate.. instead.. it makes your flyers more consistent.Can sorting cheap Ammo by rim thickness then by weight produce match quality or would it just be a waste of time? I have noticed improvements in my group sizes by sorting SK standard and SK match. The big drawback is the inordinate amount of time invested. Thanks for any opinions.
Can sorting cheap Ammo by rim thickness then by weight produce match quality or would it just be a waste of time? I have noticed improvements in my group sizes by sorting SK standard and SK match. The big drawback is the inordinate amount of time invested. Thanks for any opinions.
nice post and thank youI shoot slightly less than 10k rounds of SK, Lapua, and Eley Tenex combined per year. I compete in NRA Conventional Smallbore Outdoor Prone, and on occasion, ISSF 50M prone. My preference, and the general preference of other competitors within the disciplines are to test by lot, trying to gain ammunition that is of a consistent velocity. The USAMU did this for many many years - I do not know if they still do. My preference was for ammunition that had an average velocity of 1055 - 1060 fps., as that grouped well in both of my rifles.
SK Standard Plus/Wolf Match Target were both made by SK, which was at one time owned by Lapua. If you examine the headstamp on all three, this will become obvious. All SK was made at the same time, and then lot tested. The most consistent became SK Rifle Match or Wolf Match Extra. The least consistent became SK Standard/Wolf Match Target.
My preference is to use SK Standard Plus for practice, Eley Match Black for 50 yd/50M competition, and Eley Tenex (Red) for 100 yd. competition. Eley has a lot test result database for each of their lots produced over the last 10 years. You visit their website, input your lot no.s into the blank field and they will show you the 10 shot test group that resulted from that particular lot. The group size and velocity consistency determine whether a specific lot is Match(Black) or Tenex (Red).
Many competitors used to try and find Eley lots that had been manufactured on certain machines (numbered 1-5). Eley recommended against this, as they stated that the machines were rebuilt from time to time, and that alone would change the characteristics of the ammunition.
Good luck and safe travels this weekend @USMCDOC - I wish my prior commitment didn't prevent me from shooting the match with you this weekend.
-tc
Outstanding observation with a very convincing visual reference added. Thank You.Hello (from Germany). Here is my experience.
1.) Sorting .22LR by rim thickness for accuracy is not really helpful.
2.) The measurement can be incorrect depending on the Rim inclination.
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