I have a Winchester 1885 in 225x6mm improved on the way; I am wondering whether anyone has loads for this caliber.
Since case capacity (water) is very near 219 Zipper, I feel that I can use that data as a starting load for light bullets.
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You can use them if the case capacity under the seated bullet is the same and the bullet sectional densities are the same. You'll reduce pressure a little with the larger bullet cross-sectional area, but that will ballpark you. Greater SD than the .22 load you are taking the load data will tend to cause greater pressure. If the volumes under the seated bullet are not the same, then adjust the charge by the ratio of the difference to keep the same percent of available space filled. And still keep that same SD. Usually, that will compensate for the differences. If in doubt, use the lower of the two charges (calculated and zipper from a manual for a same SD bullet) and work up.
Ok, so that IS similar to the round I shoot. I can tell you that necking the case up is quite easy, fire-forming loads can be surprisingly accurate and the end result should be a pretty versatile round for varmints and smaller deer. Case life will be excellent, so even though the parent brass can be tough to find, you won't go through it very quickly. I'll even sell you 50 brand new cases, if you look and can't seem to find any. (I've got several hundred, at the moment.)
Yup - had a 25-225 AI in a T/C Contender barrel years ago. Had originally been made for hunting with 85 gr Nosler semi-pointed lathe cut Partitions. Nosler quit making that bullet and I didn't care for the 95 grainers, so it got sold. Dies were very expensive, as I recall.
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