but its not about rushing things, its about the satisfaction of finding a load that shoots better then factory that you load yourself. On some rifles, I have experimented for years to find the "perfect load".
A big Amen too that Larry,
I started working my 223 last December, I finally was satisfied with my load about 2 weeks ago, I'll guess 200 rounds or so.
Dale,
It look's like you found 2 spots where your rifle likes the load. Now for me accuracy is what it's all about, in this case I'd toss the 38grn load simply because of it being a 22-250, you want fast and flat, that's what the gun is for. I'd work around the 40.5. Loading 5 each of say 40.3,,40.4,,40.5,,40.6,,40.7, keeping the seating the same. I have found .10(one tenth) of a grain is enough to change a group.
I'd also mention that record keeping IS important,,log your loading info,,make detailed notes on targets and save them. It might all be freash in your mind now, but in a few months when you gain more experiance and experiment more you'll be glad you keep a record.
Here's a target I made I can run off my printer that works great for me, 1 inch grid, 2" square with a Dime as the center dot;