I picked up a winchester M70 a couple of years ago, and finally got around to shooting it. The rifle is from the early 70's and has a Hart replacement barrel on it. First shot is in the black but it keyholed. The round was handloaded Hornady 150gr FMJ, that I shoot in my Garands and M1A with no Problems. The barrel appears to be brand new and is not bent or damaged. The barrel says 1-14 twist, H2. I noticed that my reloading manual test rifle has a 1-9 twist. Could this twist rate be too slow to stabalize a 150gr FMJ bullet? If so what type of bullet would work in this barrel? TIA