So memory does serve me correctly. 55's are flat and 50's are boattail. Don't work about the flat bottom, I had a couple of hundred of them a few years ago before trying the 50's. I loaded them up in my brother's ammo and they shot just fine out of his rifle. At the time I only had the one rifle that didn't like them. Therefore I have found I have the most confidence in the 50gr so that's what I shoot exclusivley. There's really nothing wrong with the 55's if your rifle shoots them well. I just happen to prefer the 50's and the boattail. Good luck.
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