I'll stick with magnums and probably switch my .308 over to them too (I think military primers are magnum). Then I can just focus on sourcing cci250/450 for my precision stuff. 250s for 300nm/.308 and 450s for 5.56. In a pinch I could even use .308 palma brass with 450s.
That kind of goes hand in hand with the 1.35. You can get a 1.125 or 1.18 tenon in there.
Yeah, but does the 1.0625 thread tenon make the 1.35 shank a moot point?
That I don't know, someone with more gunsmithing knowledge will have to chime in.
I shoot 245s with a 9 twist, no problems out to 1952 yards for me. I do live at 3k ft elevation
I have an 8.3 twist and shoot at 250-800 ft elevation. I'm sure you'll be fine with 8.5
Don't overlook temperature. If you shoot at sea level at 20 degrees or cooler that 8.5 gives you a little buffer.
I'm just the opposite. I'll take a 20 degree morning over 100 any day of the week and twice on Sunday. Until the wind picks upNo worries there, I tap out about freezing. I will however shoot when it is pushing 100.
I spoke to a good Smith and to Bartlien, bartliens answer was kinda odd to me but I'll take it. They said that most 30 Cal magnums are built on a 1.00"/ 1.055" thread tenon.
750 bolt diameter leaves more meat around the case rim for the extractor and case head support(def do not recommend a 700 diameter bolt on a norma/lapua). Talk to the guys who've built a lot of Norma's or improved variants like Dallas Lane, Alex Wheeler or Ryan Pierce. They all recommend an action with 1-1/8 tenon diameters. My original Norma imp was in a Kelbly with 1-1/16 tenon. Newest build is on a Bat with 1-1/8 tenon.
I have a couple BAT M actions. Zero complaints. Jim Borden now makes a bigger action as well. I’ve had several Bordens, but haven’t seen the Lapua size.
It's a bat long action igniter, basically a HR without any the fancy stuff. Integral lug, pinned rail, swappable bolt heads. Cut for 4" mag box, BnA trigger times up perfectly. Very smooth, tight tolerances. Been running a short action bat bumblebee for a few years hunting and love that thing.
If you can find a long action bat igniter, its essentially the same as an hr, big tenon and integral lug, but pin/screw rail. The bolt heads are modular on the newer bat's. Believe I'm using 336 bushing with lapua, but my brass is OLD, from one first few runs they did back in 2018. I believe a lot the newer stuff is thicker necked.
I have a lightly used atlas 338 with extreme duty bolt stop. Says Piercision Rifles on the side, would make you a screaming deal on it. My first Norma imp was built on it, for the new barrel I went with the Bat.
I’m currently using an AXMC. If I was starting today I would pick up an Impact 787.
From my research that I've been doing with all this. Alex wheeler or Ryan pierce
Wheeler is a 35° shoulder, Pierce is 33°, I've been shooting the Pierce version for 4 years. I'd personally go the Wheeler route as he isnt all proprietary with his reamer/dies. Pierce is.......and Pierce didn't even design his reamer, Bjay Gambeng did. Pierce locked it all down so it's all only available through him. I was lucky enough to get a reamer from Bjay himself, and a 33° Norma imp micron die from Bullet Central before Pierce put an end to that. However Ryan did build my first rifle and it was a hammer till N570 did it in near 1k rounds.
If you can get a set of dies out of Pierce, my smith has my reamer, he does excellent work. He'd gladly do a simple barrel job.
They did upon initial release, 33° improved, but I've not saw them available for some time, just standard 300nm. Maybe call and see if a guy can get one. Standard. 300nm seating die works just fine for the improved versions.
