Thread: 270 150 Lrabs

So ive been doing some load development for a mate and his 270 tikka. Seated for mag length first lot were done with 2209 from 48 grains to 51.5 iirc? So he shot them and accuracy of all of them were outstanding like 15 shots into an inch and a half maybe smaller. B7t got piss poor speeds on the chrony only just cracking high 2500s and then they started going backward in speed as powder charge went up. I put it down to dodgy battery and bad light. So I did some more up for him with 2213sc and he shot them today and still didn't crack 2600fps and we loaded up to 2 grains over max of adi book.
So what am I missing. Inlay have set his seating die up wrong and may have crimped the load would this cause speed issues? Am I just being a pissy and just keep upping the load. There are absolutely no pressure signs what so ever. Ideas better powders? . 22 inch barrel aswell. Cheers