I rarely go over any loads I see in manuals. I looked up a 1967 Hornady Manual, which showed
50.9 grains of 4350 as maximum. (IMR4350 was the only 4350 then.)
Nosler manual #2 shows 49 grains of IMR 4350 as maximum for their 140 grain bullets.
Ken Waters in his 7mm(update) January 1982 shows 50 grains as maximum with 145 grain SPEER bullets and 48 grains of 4350 with 140 grain Nosler in his Sept 67 review of the 7x57 (All Nosler bullets then might have been Partitions and again 4350 was IMR4350)
The 48th edition of the Lyman manual shows 48 grains of IMR4350 as a compressed load.
SPEER #13 shows 49 grains of IMR4350 as compressed with their 145 grain bullet.
The Big Book of Gun Gack shows 50 grains of IMR4350 with the 140 grain Nosler Partition,
51 grains of IMR4350 with 140 gran Nosler Solid BaseThe 45th Edition of the Lyman manual shows 48 grains of IMR4350 as compressed with the 139 grain Hornady bullet.
The 1971 Sierra manual shows 48.2 grains maximum with their 140 grain bullet
7th edition of the Hornady manual shows 45.9 grains as maximum for IMR4350 and their 139 grain bullet.
Of course they used cases made by various case manufacturer's with various capacities.
When I loaded this ammo I suspect that I stopped at 50.9 grains as shown in the 1967 Hornady Manual, I loaded these quite a while ago* and I'm just guessing. I used WW cases BTW.
* I believe I bought this rifle in 1981 and likely these were loaded back then for a Pronghorn hunt.
