35WhelenAI
WKR
- Joined
- Nov 20, 2021
- Messages
- 1,551
My 300 WM pretty much settled on IMR7828. Really does well with the heavier bullets and a bit less charge weight than H1000. My personal preference is for a fairly full case but not compression. Mid to high 90% range works great.
Had the bolt stop shortened, took out the sheet metal filler in the magazine box and got a magnum length follower for my M70 Synthetic Matte Sporter. I seated the older Barnes 180 XBT out to 3.600 in and was able to get a bit more velocity with the subsequently slightly higher charge weight I worked up to. I tried fire lapping back in the mid-90s based on a Shooting Times article and I think I was a bit overzealous and the throat on that rifle is very long, lol.
Edit: Lee factory crimp die will get you consistent bullet release tension, helps eliminate potential inconsistent tension as case are sized and resized.
What ranges are you wanting to shoot at big game? Midway has 180 Barnes TTSX available, superb game bullet. Barnes doesn't have 180 TTSX data for H1000, start with mid range 200 gr Barnes data (which they have for H1000), watching for pressure indicators and you should easily get 3,000 fps.
Had the bolt stop shortened, took out the sheet metal filler in the magazine box and got a magnum length follower for my M70 Synthetic Matte Sporter. I seated the older Barnes 180 XBT out to 3.600 in and was able to get a bit more velocity with the subsequently slightly higher charge weight I worked up to. I tried fire lapping back in the mid-90s based on a Shooting Times article and I think I was a bit overzealous and the throat on that rifle is very long, lol.
Edit: Lee factory crimp die will get you consistent bullet release tension, helps eliminate potential inconsistent tension as case are sized and resized.
What ranges are you wanting to shoot at big game? Midway has 180 Barnes TTSX available, superb game bullet. Barnes doesn't have 180 TTSX data for H1000, start with mid range 200 gr Barnes data (which they have for H1000), watching for pressure indicators and you should easily get 3,000 fps.
Last edited: