Does anyone have any reloading data for the 7x57 improved. Also, any advice on dies for this caliber.

7magman-

IIRC, P.O. Ackley's book has the 7x57Imp. maxing out at 53 grains of IMR4350. Max in most other reloading books, for 7x57 (standard), is between 49 and 50 grains of IMR 4350. When I loaded for 7x57Imp, I never tried any other powders; I always thought WW760 would be a good choice, also.

As for dies, I'd go with Redding. Sometimes, you can catch them on sale at Midway, or E-bay. You might even want to run an add here.

Will look up my info tonight and try to post tomorrow. H-414 is good, of late IMR 4064 has shown promise, IMR 4350 is good. RCBS can provide dies

Hiya
I've been shooting a 7x57 AI for about five years now and have compiled quite a bit of data from experimenting and range sessions.
The rifle was made by C. Donnelly who took over P.O. Ackley's tools and business, so the chamber dimensions are exact to P.O. Ackley's specs.
F.N. 98 Mouser action
22" barrel 1-9" twist.
There are going to be some differences in chamber dimensions depending on who did the work.
The dies I use are RCBS Group G 7x57AI 40deg and cost about $75.00. Donnelly had to shorten the sizer die just a little to make it right with my rifle.
The most consistently accurate loads I have discovered so far are with 160gr and 175gr bullets using H-450 powder. Unfortunately H-450 is no longer available but I do have a little left to make hunting loads. H-4831 works almost as well as H-450.
If you have any specific questions feel free to PM me and I'll share what I know.

I liked H450 in a lot of calibers, but haven't had any for years.

Ive considered investing in a 7X57 AI reamer and building one or two of them. If I did I would probably just use a set of Lee collet dies for a standard 7X57.

quote:

Originally posted by 7magman:
Does anyone have any reloading data for the 7x57 improved. Also, any advice on dies for this caliber.

7magman;

I have been shooting a 7x57AI (40deg) a few years and have found WW760 and 140 Nosler AB's to be just the ticket in my rifle. Redding dies seem to work, and I doubt if you would notice a difference with RCBS. Good Luck
Lee

120 gr Sierra spitzer try 48 gr H414 and work up (my max was 52 gr)
140 gr TSX try 47 gr H414 and work up (,y max was 51.5 gr), or 43 gr IMR 4064 (max was 47 gr), and try 44 gr IMR 3031 (max was 46 gr)

With remington brass

I hve a friend with one of those in a #1. He likes Reloader 19 as I recall. Excellent cartridge IMO.