pp 25 acp in a 257 robertsII

[sambone2]

I want to make a small game load @ about 1500 fps using a 50 gr 25 acp in my roberts.  Anybody tried this?  Suggested powder?  Thanks samb2

[JBMauser]

I did what you are trying to do with my Enfield .303 and 71 grain 32cal jacketed pistol bullets.  At 35 yards I had a 2 1/2 in. group.  this is full military sights and wood,  I used 13 gr. of Unique.  It was easier to load the bullets inverted and shoot them as wad cutters than it was to get them started straight into the neck.  The inverted group was wider at 3 1/2 in.  I plan on repeating this with the lee loader I just acquired to see if I can shrink the groups. 
great plinker.  best of luck with yours.  JB

[Castaway]

Don't think you'll be able to patch the bullet.  You might try cigarette paper but my luck with it has been dismal.

[iiranger]

First problem, .25 ACP balls are usually .250 in diameter or approx. .257 Rob calls for bullets that are .257/.258 in diameter. Ergo, you have to do something to enlarge the bullet or it wobbles and accuracy ISN'T. As said, you can paper patch anything, but getting two wraps in .007... and something this small... makes my fingers sore thinking about it. There are "onion skin" / "copy" papers that  might work. And if it is a bit large, you can run it thru a size die (and lubricate it too if you like). 1500 no problem here.

If you are willing to use lead bullets, you can upset them by tapping with a mallet. If you want precision, you support them in a die of some sort. This would get you a groove filling bullet. Well lubed and you can go to the Lyman manual for loads. Might not have bullets quite this light, but fast powders, no big deal. IMR had a manual out that listed loads for all their powders in each round. The 4831 loads for .22 hornet or .222 were silly, but informative.

It has been done. The other option are the chamber inserts that allow you to shoot the whole cartriddge in the larger chamber. luck.