Who makes the best Rim thickness gauge??

[Candocad]

What kind of rifle do you shoot to experience the same results with bulk ammo as with entry level target ammo?

I've used mainly 3 rifles for the 'bulk' ammo batch accuracy checks:
1/. Sako Quad with a bull type target barrel.
2/. Norinco NS522.
3/. Ruger 10/22 with Dlask bull target barrel.

The 'budget batch' approach is as follows:

3-4 boxes of budget ammo: all individually rim gauged. This gives 6-12 different rim thicknesses. (Normally, the more expensive the ammo the less variance.)
Each round is given a wipe with a cloth (some manufacturers have the round very heavily coated with lubricant / wax) and placed in a MTM type rimfire round box head down dependant upon its rimfire rim size.
Each box therefore has a very similar / identical rim size.
5 round test x 20 times at 75 yards from a sandbag, non windy if possible. Taken slowly, normally 100-300 rounds maximum.

This method, I find, has brought in the groups in most of the above rifles.

Examples that have surprised me are:

American Eagle (yes that cheap crap) when batched as per above can derive groups similar to both CCI Green / RWS Club in the Norinco and the Sako.
I have 5 different modified Ruger 10/22's, and only two show a common preference: Eley Match. One loves Aguila Match. Only problem I have found is that the most accurcate is not the most reliable in cycling terms.
For the Sako it prefers RWS Rifle Match, but it gives a similar performance with bulk Federal 525 value pack as sorted as per above.
The Norinco performs very well Blaser Long Range sorted via rim thickness.
Both of the bolt action rifles perform best with Eley Tenex, but what doesn't?

Does batching of basic bulk ammo, via the rim thickness produce the best round for target shooting? No, just buy a premium brand / round and run with it.
Does batching of basic bulk ammo, via the rim thickness produce more consistently accurate rounds for target shooting when compared to unbatched basic bulk ammo: Yes, absolutely.

Even when plinking with the above rifles, I notice a better result with batched ammo. (I take plinking way too seriously!)

I my experience.

Candocad.

 

[grauhanen]

I've used mainly 3 rifles for the 'bulk' ammo batch accuracy checks:
1/. Sako Quad with a bull type target barrel.
2/. Norinco NS522.
3/. Ruger 10/22 with Dlask bull target barrel.

The 'budget batch' approach is as follows:

3-4 boxes of budget ammo: all individually rim gauged. This gives 6-12 different rim thicknesses. (Normally, the more expensive the ammo the less variance.)
Each round is given a wipe with a cloth (some manufacturers have the round very heavily coated with lubricant / wax) and placed in a MTM type rimfire round box head down dependant upon its rimfire rim size.
Each box therefore has a very similar / identical rim size.
5 round test x 20 times at 75 yards from a sandbag, non windy if possible. Taken slowly, normally 100-300 rounds maximum.

This method, I find, has brought in the groups in most of the above rifles.

Thank you for the information. The rim sorting results with bulk ammo seem incredible.

 

[horseman2]

While I have a Bald Eagle it is my wish to share with you the cheapest . . .

One 243 Winchester full length resized and trimmed to length.



It will run side by side with the Bald Eagle until the caliper starts showing an error when zeroed.

 

[yodave]

SK Rifle Match ammo sorted into 0.039. 0.040 and 0.041, anything outside of these measurements went into the fouler box
50 meter test tunnel with a proven rifle capable of the testing the true results of rim thickness, quite obvious that my rifle does not like anything that measures more then 40 thou, vertical stringing was the result.

Both targets on the left are 39 thou, ones in the middle are 40 thou, right hand targets are 41 thou, so is rim thickness a thing??? you bet your ash it is.........

 

[KDX]

I know a member here who made a really cool rim thickness gauge recently. I will ask him if I can post pics, or maybe he will.

 

[barsik]

I made mine out of a Hornady .243 comparator but I had to stack about 6 or 7 thin flat washers in the bottom of the caliper adapter so the bullets wouldn't bottom out on the nose. there was just enough left for the setscrew to secure the comparator to the caliper adapter. works perfectly, but I had to spend some time drilling out the center of each washer to a quarter inch. maybe flat or specialized machine washers the proper diameter wouldn't need to be drilled out.

 

[KDX]

SK Rifle Match ammo sorted into 0.039. 0.040 and 0.041, anything outside of these measurements went into the fouler box
50 meter test tunnel with a proven rifle capable of the testing the true results of rim thickness, quite obvious that my rifle does not like anything that measures more then 40 thou, vertical stringing was the result.

Both targets on the left are 39 thou, ones in the middle are 40 thou, right hand targets are 41 thou, so is rim thickness a thing??? you bet your ash it is.........

This is a good post/ammo test. Thanks.