I had issues with flat base bullets until I set my case necks up with no more than .003" neck tension and Use the Lyman vld chamfer tool.
Here
https://ads.midwayusa.com/product/1...MIz9iP_MHF6wIVQeDICh0xUAYxEAQYASABEgJM9fD_BwE
When I used the RCBS rocket ship tool I was peeling guilding metal off the bullets during seating and accuracy suffered.
This here.
https://www.amazon.com/RCBS-17-60-Deburring-Knurled-Steel/dp/B00162QL1S
Look below that and I see a VLD in that style.
https://www.amazon.com/McJ-Reloadin...07QHDJ2QB/ref=cm_cr_arp_d_product_top?ie=UTF8
Here
https://ads.midwayusa.com/product/1...MIz9iP_MHF6wIVQeDICh0xUAYxEAQYASABEgJM9fD_BwE
When I used the RCBS rocket ship tool I was peeling guilding metal off the bullets during seating and accuracy suffered.
This here.
https://www.amazon.com/RCBS-17-60-Deburring-Knurled-Steel/dp/B00162QL1S
Look below that and I see a VLD in that style.
https://www.amazon.com/McJ-Reloadin...07QHDJ2QB/ref=cm_cr_arp_d_product_top?ie=UTF8