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243Win GRT pressure predictions vs Book Data

I'm asking for a little help to understand. I have loaded but not shot yet a short ladder using the 105gr Match Burner and H4350 in my 243Win. I want to see if it will stabilize. I made 10 rounds, 2ea at .3gr intervals. My intentions were to shoot 5 at 100yds and 5 and 200yds to see if I have...
- Nimbus73
- Thread
- Jun 6, 2025
- Replies: 3
- Forum: Reloading
Headspace question

How much influence does headspace/shoulder bump have on velocity, sd/es and groups? I resized 26 pieces of brass yesterday for some confirmation loads. I was aiming for about a 1.6265" bump on my 243win. About half measured 1.6255 to 1.6265 but the rest varied all over as much as back to 1.622...
- Nimbus73
- Thread
- May 13, 2025
- Replies: 10
- Forum: Reloading
Reloads, just how anal are you?

Please bear with my wordiness on this discussion but I'm really curious on just how good is good enough. I began following this site as well as others in my quest for knowledge as I am almost 1 year into the reloading rabbit hole. I probably spend more time accumulating "stuff" at this point and...
- Nimbus73
- Thread
- Jan 6, 2025
- Replies: 56
- Forum: Reloading