Seating depth advice

[BenInMT]

I have learned that freebore can be a good thing. I think some of your increments are too fine to give meaningful data, and your biggest jump is only .055”. Try jumping them farther. Would I take a load that shoots great .025” jump but bad at .030”- no way because I’ll always be chasing the lands as my throat erodes. I’m looking for a wide comfort zone. Not sure if you’re using a magnetospeed but you posted velocity data- I would not do this work with one of those strapped on my barrel.

 

[std7mag]

I have learned that freebore can be a good thing. I think some of your increments are too fine to give meaningful data, and your biggest jump is only .055”. Try jumping them farther. Would I take a load that shoots great .025” jump but bad at .030”- no way because I’ll always be chasing the lands as my throat erodes. I’m looking for a wide comfort zone. Not sure if you’re using a magnetospeed but you posted velocity data- I would not do this work with one of those strapped on my barrel.

If your trying to find your powder charge with the velocity node method, the Magnetospeed is fine.
Personally, i wouldn't use one if i were trying to shoot groups.

I have been to a short range BR match and someone have a Magnetospeed strapped to the barrel during the match.

 

[Anakin67]

Where should I go from here? 300 H&H Mag. 180 grain Accubonds. 67.5 grains of IMR 4831. CCI primers and Nosler brass. 3.652" OAL to lands.

3.585" OAL. ES=100 fps. 1.5 MOA (3-shot group)
3.595" OAL. ES=25 fps. 0.9 MOA
3.600" OAL. ES=15 fps. 0.7 (2-shot group and a big flier)
3.605" OAL. ES=14 fps. 0.8 MOA
3.613" OAL. ES=47 fps. 0.6 MOA
3.625" OAL. ES=25 fps. 1.18 MOA
3.640" OAL. ES=14 fps. 1.15 MOA

Obviously, the 3.613" created the best group. I am surprised it shot so well with the ES being 47 fps. Should I try any other lengths to try to get better than 0.6 MOA? I am kicking around trying 3 shots at 3.610" and 3 shots at 3.620". I don't have a big surplus of reloading supplies to be messing with load development without eating into my supplies a little. This is the first time I have ever messed with seating depths as my other rifles seem to shoot great with advertised OAL. The advertised OAL for this load is 3.600", but I got a huge flier (2") out of it.

Johny did you ever sell your xbolt 22-250? I’d be interested. Not paying $50 or replying to 10 links, or waiting 7 days to become “verified” hope this works. [email protected]