4 Attachment(s)
Accuracy at 350 yds update
Finally warmed up to go shoot. Have been running test on velocity and barrel fouling using a Savage 308W rifle with a 26" barrel and a Whitt Machine break using powder coated Lee 170 gr cast bullets( with copper). PC was one coat shake and bake after setting gas check and locking it in with a Lee .310" push through die. After PC (water dropped) and resized sized to .310" on the drive rings and bore rider section to .301" with home grown sizer which uses modified Redding neck sizing bushings. Brass was processed with a neck sizing die and then with a homemade expander plug to give .002" neck tention. After the initial inside brass neck chamfering , from then on the long taper chamfering tool is run backwards in a batter powered drill to eliminate ANY scraping. Bullets are seated using the old CH seating dies with the sliding which perfectly aligns thr bullet with the case and completely eliminate scraping and mis aligned bullets. Over the last couple of months I have been working on PCed HV rifle velocities and the resultant barrel fouling. Just to eliminate variables bullets we cast at one time, dried, powder coated with different powders but bake in the same oven wit a thermocouple to insure temperature. CCI 200 primers and IMR 4895 powder. I plan to stay at 41gr till summer weather due to the flatting of primers (not excessive but there is significant increase from 12' to 30'F Today for 50 round the lowest when barrel was perfectly clean was 2634fps for first shot and as the barrel begin to foul velocity went up to 2790fps. Accuracy did degrade but not enough that could not be managed by field clean. I will include a 300 yd plate just for fun before it was cleaned and cleaning patches showing color, powder charge, and number fire before cleaning. There is a difference between fouling and the colors used as well as some colors seem to continue fouling longer than others. Smokes John deer Green so far seems to build to a low level and does not build any higher. He is looking to help determine if it is the pigment or the polymer that makes the more desireable powder for HV rifles.
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