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Interestingly enough, as I was pushing the bullet down the bore, it became very easy once I neared the chamber, but still several inches up the barrel from the chamber. That tells me that where the bullet is initially engraving into the bore, it's fairly oversized. That's probably why this...

The barrel slugged at .506 - .507".

Much obliged, good Sir!

I've not fired factory loads in this, and at $15/pop, I doubt I will anytime soon. And yes, I'm using Large Rifle Magnum primers. Interestingly, I've read some anecdotal evidence of "slow" .505's due to having oversized barrels, .507-.508". I haven't slugged the bore yet, but I may do that...

Well, now I have two correct chronographs :Banghead: :LOL: I corroborated my original numbers with a new chronograph, and both are reading the same. I guess I've got more work to do!! AC :W Cal 50:

Barnes lists RL22 with the 525 TSX, 125.5gr - 133gr, for a max velocity of 2223fps. I know there's not a direct substitution using powder burn rate charts, but H4831 looks to be very similar, if not a touch faster than RL22. Basing a theoretical max of 130gr (conservative) of H4831, reduce 10%...

So far, it seems to me, two things are occurring. One, I've got a slow batch of H4831. Two, I've got a chronograph that's reading low. I've got a new chronograph on the way, that will definitely clear things up, I hope! Thank you for your input.

Just returned from a range session with my 505 Gibbs, and I'm a little baffled and wondered if anyone else has experience that could be of help. I loaded 5 of the 525gr TSX with 117gr - 129gr of H4831 powder. Also loaded 5 of the CEB 525gr solids with 117gr - 129gr of H4831 powder. Chrono...