I thought about the two big 50's offered by CZ and choose the 505 because I like the round better. On a more emotional level yes - I choose the Gibbs for the history and romance of the round and just for the looks. The looks difference is dramatic! I suggest you examine both prior to changing you mind and going to the Jeff. The Jeff is short fat round, with a rebated rim and short neck. I am sure it can work, but feeding problems were reported in the past history. The original 23 guns were single stack feed, that probably did much to reduce feeding problems. The 505 is a big round, long case, long neck and no rebate compromise. IMHO - impressive as all get out. The 505 is better suited to staggered magazine and although the rim diameter is large for the CZ bolt face, it does fit. If the 505 is considered marginally large in size for the CZ, then by the same standard the 500J is small for the CZ. The 500Jeff is really an ugly compromise designed to fit in a standard Mauser and IMHO is a waste of a magnum action.

Now, of this is in any way meant to be a practical consideration, just my 2c on a side by side emotional comparison of these two 50's. In the CZ, I opted for the Gibbs and never looked back. What and beauty of a round and what a chance to relive history. The function and reliability of my 505 Gibbs CZ have been perfect although I cannot say the same for my cheapo 458Lott by same. The custom shop 505 priced under $3k is the deal of a lifetime. It is no trick to build a 500Jeff (well maybe it is, but length is no problem). Until the CZ550 the might Gibbs was homeless. Now, that has changed and we are a better world for it.

If you dont count the 50bmg bullets which are too long, seems to me all or most of the best bullets are available in both 505 and 510. It not a shortage of bullet choice but a shortage of $$$ that limit bullet purchase. Casting might be best route for low cost practice.