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Loading for AR-50A1 - Bullet Seating Depth and Bullet Jump

Anyone out there loading for the AR-50 using Hornaday 750g A-Max. I built a home made modified case and max bullet seating depth tool and found out that the throat on the AR-50A1 is so long my bullet fell right out of the case with almost none of the flat of the bullet sides engaged in the flat of the case neck. When properly loaded according to Hornaday with a minimum 1 bullet diameter depth into the case, that leaves me with a 1/2 inch min bullet jump. This took me completely by surprise as I'm new to 50 BMG and use to tuning my bullets in the 5 to 50 thousandths range off the lands and grooves. Not 1/2 inch.

Is this normal? Can this gun still be accurate at long range? Does a 1/2 inch jump for a 50 BMG mean anything at all?

I planned on doing my normal load testing and see if these is a sweet spot in there somewhere based off of the Hornaday recommended OAL. Just want to see if anyone has paved some ground ahead of me here.

Mike.
 
I have done some load work up on a couple of 50's one of them had a long throat that the bullet wouldn't touch so I just seated them to where the bearing surface was right at the neck shoulder junction 5.580 oal and worked up with H50 and imr 5010. Got good results with the H50 with the longer throated rifles and 5010 worked really well with the shorter ones. Start with 210 gr H50 and work up to 230 the best loads I have found is between 210 and 225. ;)
 

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