@bohem my last 6mm Osprey prefit was a 1:7.5 twist and shot great like every barrel I got from PVA.
I see you prefer the 1:7 twist and was thinking about getting 2 more barrels with the sale and going 1:7. I’m only shooting 109 Bergers.
Think switch to 1:7 good idea or stay with 1:7.5??
I like the 7 because it gives extra margin that allows cold weather, very long distance shots with solids and other high BC bullets. In warm summer weather the 7.5 does just fine, but things become spotty when you get out a ways and the DA drops near or below 0. It also shows a slight increase in BC for bullets that already shoot really well, but a slight increase in the BC of about 1.5-3% consistently shows up in doppler testing in tests that have been done by Hornady on my bullet designs, an independent lab at NMIT and data that was released by AB's mobile lab on our bullets and the 109 Hybrid being shot in Ospreys.
I've been shooting 7tw 6mm's exclusively on my personal match barrels since 2018 and I've got close to 20k rounds of various jacketed and solid bullets fired on them in that time. (Anyone doing the math will realize that I don't get to shoot that much any longer)
I know you will have exceptional performance with the 7tw, and I advocate it to anyone that's willing to listen to my opinion on the topic.
As usual, we'll make you whichever you ask for, but if it was my money being spent I would use a 7tw.
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