I am looking into parts for a build in 6.5x55. I came across a 1:8.5 twist brux blank and will probably get it in 24" varmint profile. Would the 8.5 twist be good for 100-140gr bullets and for the 140s in the match/vld?
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I am looking into parts for a build in 6.5x55. I came across a 1:8.5 twist brux blank and will probably get it in 24" varmint profile. Would the 8.5 twist be good for 100-140gr bullets and for the 140s in the match/vld?
Depends on how fast your are pushing them! Berger has a good twist calculator you can use their website. I ran the 140VLD's in an 26" 8 twist 6.5-06 and didn't see them tighten up until I got them around 2950fps or better. I think standard Ogive 140's will be fine though in an 8.5 for sure.
I will check out the berger sit thanks
For the Swede, go with 1-8. Especially if you are going to use Bergers.
I would second WBM's suggestion to get the 1:8 twist. I have a Shaw 1:8 twist barrel that is accurate, (when I do my part) out to over 1000 yards with no difficulty. i have not shot it in a while, but I think that was with 140 A-Maxes. Rule of thumb for me is to go with faster, versus slower twist barrels, although I understand that there are situations when a slower twist may be more appropriate.
I have a 10 twist I mostly shoot they Sierra 107gr, they are a good balance between being light enough for some half decent velocity, and yet they still have an good BC, I can shoot 129s no problem but have never tried the 140s or 142s, I bet a 9 twist would stabilize them.
Dean
I am going to order and wait for a 1:8 instead of the 8.5. Should I still be able to get good results with the lighter 100ish bullets or should I just leave the lighter stuff to a different rifle?
I've got a 8.5 twist Mcgowan and it shoots the 140's and 142's just fine.