For those of you having experience with both, is one better than the other? Is it just preference? Like Chevy vs Ford?
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I have both. The first Custom action I ever bought was a BAT HR. I bought it new sight unseen based solely on what I had read about them. I shouldn't have done that. The only thing I like better about the BAT is the tenon thread size for large diameter cartridges. I think the Deviant is a much better action than a BAT HR.The Bat HR and the Deviant long actions. Both (either) would be used in a chassis.
I would certainly be open to suggestions.
My buddy has a BAT and has had a lot of issues getting it to reliably extract fired cartridges. We've pulled his shit apart and double checked barrel dimensions, ensured nothing goofy going on in the chamber, etc... and can't figure out why it's doing it. Extractor just decides "Nope" 10-15% of the time. In the time waiting to get his stuff back from BAT in working order he bought a Nucleus and is very happy with it. Also, this is completely subjective, but I hate how their bolt handle looks on the top side.
I used to bag on Defiance for the overly tight bolt/receiver fit but I think anymore they've backed off of that stuff so you can cerakote them or run them in a little bit of dirt. Also, I'm still not a complete fan of SS being nitrided, but provided you don't grenade your action with handloads, they run pretty fucken slick.
Machining and finishing on both is exceptional. Personally I'd lean towards Defiance between the two, but neither would on the top of my list. YMMV.