I got my M700 in 280 AI back from the gunsmith. I had the action blueprinted and installed a Hart 24" #5 Flutted barrel 1-9 twist and Tubb recoil lug. For now I am using a Leupold VXIII 2.5x8 but will change to a VXIII 4.5x14.
Started load development with the 160 gr AccuBond and RL22. After 75 rounds, (50 fire forming) I have the following results:
60.0 grs RL22
COL 3.495", .015" off the lands
3 shot groups of .295", 218"
moving up to 61.0 grs.
58.0 grs RL22
3 shot group of .575" ( first 2 shots were .161")
59.0 grs RL22
3 shot group of .510" (first and third shots measure .153")
moving up to 60.0 grs and 61.0 grs.
I am happy with the way this rifle is shooting, considering I am using R-P brass and I haven't squared up the primer pockets or turned the case necks. I may be pushing the limits of the 8x scope while trying to achive sub 1/4 MOA. My goal is to hit 3000 fps with the 160 gr AB. This would be a great long range deer, antelope, and caribou load that will buck the wind and take out the vitals from any angle.
If anyone is interested, I will keep you posted with future results.
Location: The rifle range, or archery range or behind the computer in Alaska
Re: 280 AI Range Report
That is good info. I have been thinking of having a 280 improved put together for my LR sheep rifle. 308 accuracy with near 7mm mag performance. I like that idea.
Are you going to try the 162 AMAX??
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
I am happy to share my results, hope it will help you guys out in the future.
I am a Nosler fan so I will stick stick with the AccuBond. Once I get the 160 gr set, I will work up a load for the 140 gr.
BTW, my fire forming load was 140 gr Nosler BT with 57.0 grs of RL19 and a Fed GM210M primer. This is a proven load in my 280 Remington.
20 shot group was around 1.5" but I wasn't very serious about the group. I was pressed for time, wanted fire formed cases. I will shoot for group the next time I FF cases.
DJ, would you mind telling what these types of improvements costs? Ballpark is good enough, I have no idea what we are talking about. Im assuming this included the AI conversion since you mentioned fire forming your cases.
"The fear of the Lord is the beginning of wisdom, all who follow his precepts have good understanding."
The cost was around $1000.00 for materials and labor. It was a little more than I expected but the results are well worth the investment.
I have settled on the 160 gr AB with 62.0 grs RL22.
Consistantly shoots in the .2's at 100 yds.