Try loading your gun with one cartridge at a time. Still getting the squib loads?
Heavy recoiling rounds have a nasty habit of raising havoc with unfired rounds still in the cylinder. They can cause the bullets to pull out of crimps and they can actually de-seat a properly seated primer.
Here are a few things to try......
Make sure your primer pockets are clean, flashholes polishing media free, and primers seated to uniform depth. Lee makes a great priming tool to do this. Mine of pressed in 10s of thousands of primers without a problem. (I'm glad they didn't paint them red)
Take a sized brass and one of the styrofoam trays that you get meat in at the grocery store. Push the sized brass into the foam and cut out some discs. If they get stuck in the brass, stick a needle or pin thru the primer flash hole and push them out. (i have brass made up with drilled out flash holes and use a nail, head inside the case, to push the discs out.) After you have sized, primed, and put powder in the case, put the disk on top of the powder and push it down with a pencil. Then seat your bullet. This disc will uniformly hold the powder next to the flashhole.
Set your dies to seat the bullet in one step, then readjust to crimp in a second step. Lots of dies are "made to" seat and crimp in the same step. The crimp is made to hold the bullet, the dies is trying to push it. Kind of working against itself huh... Seat the bullet in one step with the crimp grove, cannelure, etc about one hair's width above the top of the brass. After you have seated all the bullets (moving in the belling a little is ok), then readjust your die to do a GOOD uniform roll crimp into that grove or cannelure. You will see the bullet is no longer a hair's width from the top of the brass, but several hairs width. Do you have a nice ring around the entire case? if not, readjust your die a little, or spin your round in the shell holder 180 degrees and run into the die again.
OK, you have clean primer pockets, clean flashholes, powder retainers in place, and a good roll crimp. You should be good to go with WW296 loads.
Good Luck,
Steve