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Rifle Boolits Complete Powder Coat or Drive Bands Only
In another thread 405grain posted some ideas on what he termed Hybrid Boolit Powder Coating. See: https://castboolits.gunloads.com/sho...Hybrid-Boolits
In essence powder coating the driving bands only; leaving the nose uncoated. This was an alternative method to completely powder coating the boolits. I tried a few of these and started wondering what the accuracy differential was between fully Powder Coating a rifle boolit – shooting a group and then shooting the same load and boolit with driving bands only coated.
I shot two styles of boolits in a test today; the RCBS 200 Sil and 311290 in my Remington 700 chambered in .308 Winchester. These boolits are on the heavy side for the .308; but I have been shooting a variety of heavy boolits this winter in the .308 Winchester. The following pics show a Completely Powder Coated and a driving bands only powder coat of the RCBS 200 Sil. (Green); And a Completely Powder Coated and a driving bands only powder coated 311290 (Blue).
Attachment 297443 Attachment 297444
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RCBS 200 Sil Full Coat and Drive Bands Coated
The following Target is 10 Rounds of RCBS 200 Sil Driving Bands only coated. 1.876 MOA
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and then 10 Rounds of RCBS 200 Sil Fully Coated. 3.977 MOA
Attachment 297445
Driving Bands only had much better group with the RCBS 200 SIL boolit (Gas Checked and 30 Grains BLC2).
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311290 Boolit Drive Bands only and Full Powder Coat Test
The following Target is 8 Rounds of 311290 Driving Bands only coated. 7.502 MOA
Attachment 297447
and then 10 Rounds of 311290 Fully Coated. 1.749 MOA
Attachment 297448
Before going to the Range I had expected that one Powder Coating Technique or the other would provide better accuracy. Unfortunately; it’s a head scratcher as the group results between the two techniques on two different boolit styles were inverted.
Anyone else have any similar tests and results with Targets they can share?