My uncles,dad and I ran Speer flat base (hot Cor) bullets exclusively back in the eighties and nineties shooting a lot of crop damage deer. 280’s, 270’s and 25-06’s. Never had issues with a bullet one. We tried some Speer BTs in the 270 and 257 variety and they started to show a little weakness if pushed hard. I still have some 145 gr BTSP 7mm that I use in my 280 Rem. Very accurate and work excellent on deer but I don’t run them hard out of my 280
I have used a few over the years. The only one I had issues with is the 7mm 130 Hot Cor flat base. I don't have rifle I can make them shoot out of. I have tried a few boxes of them and they just don't shoot for beans in a few of my rifles. Now, the Boattailed version shoots well. No darned idea.
