switching from 308 165 BT's to ABs; load data use?

[WI_XP]

I've found an H4895 load that works great for BT's; it's listed as a max, but shows zero pressure signs (XP-100 handgun, Lapua brass) and is very accurate. The OAL is 2.83, which is a bit over spec. I didn't realize the AB's are a bit longer than the BT's (1.308 vs 1.290). I think if I load to the same OAL the bullet base will be contacting the powder, and I don't want to have a compressed load. Is the shape of the AB such that if I load it so the base of the bullet is the same place within the brass, the bullet won't be contacting any closer to the lands than the BT?
I'd like to avoid having to start from scratch on load development, but if I can't safely swap the two, I'll back off and work my way up.

 

[Divernhunter]

Just a question. What is the reason for not wanting a compressed load? My best loads are compressed loads.

 

[WI_XP]

I haven't seen any H4895 loads listed as compressed, and as it's a max load, I didn't think compressing it would be wise...

 

[Richracer1]

Compressing isn't a big deal, but since you're starting with a new component, I'd advise re-accomplishing your load developement with the 165AB.

 

[JD338]

WI_XP

Welcome to the forum, glad to have you here.
Since you already have a proven load, start from there. Just back off a couple grains and work up.
Let us know how the AB shoots for you.

JD338

 

[DrMike]

As has already been mentioned, it is always good to back off a bit before verifying a load by working up to the max. H4895 is a good powder for your purpose. The amount of compression, if any, shouldn't be significant.