22-250 AI 1x8 twist load data needed

[Veritas]

I had a 22x250 1x8 twist done up a few years ago and never shot it. Simison built finished 29" lilja in a McMillan Hunter class stock. I want to work up a load for this but need some help on the loads. Early fall I like to use it for Pdogs at 500 plus shooting.

Don't know if I should cull winchester brass or go for the Norma?? Bullet selection there's a few choices Berger 73 gr Match BT or the 77 gr Match BT. Hornady has the A Max 75gr and the 80gr.

It's the starting load and powder selection that I am after. Seems there's not allot of info on data once you move past the 60 grainers.

[Lost creek]

For my 22-250ai 8 twist i fireform with 39grs. rl-22 and then use 42.5 grs. rl-22 with 75 and 80gr. bullets. I found the 75gr. a-max to be the best varmint bullet because it does more damage,as the 80gr. sierra and nosler just pokes a hole.

[Bill Gunn]

I worked up a lot of loads with H-414, and Berger 75gr VLD's with Molly.

I started at 35.0(2800) and went up to 44.5(3670FPS) Anything over 44gr was much to hot in my gun.
I settled on a load of 43.5(3532fps) These loads worked great at home here where a VERY HOT day is 85*f, and they averaged right around 1/2 " very consistently.
I connected on a woodchuck at a hair over 725yds the first day I had it out.

My gun is a bench only gun, with a tight neck, very heavy 1/8 Hart barrel with a heavily weighted stock for a total weight of 32#. It has a Premier Reticle 6-20 Leupold.

I trimmed, weighed, and sorted through a lot of R-P brass to get 500 good ones, but they worked out good for me.

When I took the gun out to South Dakota for some PD's, and did some shooting at 90*f and higher it all fell apart.
The bullets all became a gray cloud at 50 to 75 yards out, and never reached the dogs. I actually found a jacket on the ground that a small trap door opened on the side of the jacket where it rode the rifling, and ALL the lead was out of the bullet.
I called Berger, and was told to keep the speed down closer to 3000 fps if I was going to hunt in the higher outside temps.

I just worked up a new load with the Berger's (I tried the Hornady 75's but they won't work at all in my gun, fliers, and even keyholes, but they may be fine in your .

The new load is 36.5 of H414 and they average 3117fps with 1/2 " groups.
I'm leaving for S.D. a week from tomorrow, so in a few weeks I'll know how they work out.

While doing some testing with 60gr Sierras and 31gr of IMR4064 @ 3050fps (used for fire forming) I got some really nice .150 to .261 groups !