45th edition Lyman load book (1970)
7mm Rem Mag
140gr bullet Sierra
start
IMR 4895 50.0gr vel 2744fps pressure 41.100 CUP
Max
IMR 4895 57.0gr vel 3054fps pressure 52,000 CUP
Cases Rem, primer Rem 9 1/2M
test firearm Universal receiver 26" barrel.
that's the closest I can get and the data is over 50 years old, so take it for reference ONLY not for use.
I realize the post says IMR 4895, not H4895. So the transition by Hogdon from surplus powder to newly manufactured probably does not apply.
But I will say I'd be very skeptical of 1970 vintage load data myself.
My example was PROBABLY H4895, But picture a group of Olde Retired Guys at the coffee shop, when they could still smoke a pipe with coffee after breakfast. One says "Hey,Dave,back when we were still elk hunting together
,you had a good 30-06 load you put together for that Mauser I built. That load always worked real good in that rifle. My Son is wanting to use that rifle to go hunting this year. Could you make some of those same loads for me?"
Well,Dave says "Sure"
Later,the Son brings the rifle and ammo to me. He says "I can't believe how this thing kicks!! I'm wondering,are the primers supposed to fall out like that? And that black stuff..."
Well,of course I look to the primers(that are gone) Gonna read me some of those "pressure signs" The primer pockets are splayed out. Scary stuff.
The powder was one of the 4895's. (Probably Hogdon. These guys hunted with the same Gunsmith Louie Baechler who used to sell me bulk surplus H-4831 for $1.60 a lb. )
I broke one down and weighed it. The charge matched up perfectly to a safe,under max load published in P.O.Ackley's "Handbook for Shooters"
I'm sure Old Dave conscientiously looked at notes and duplicated the exact load that shot safe and well in that rifle.
But,in good faith,he may have bought "Newly Manufactured" H-4895.
The red can DuPont IMR powders were still on the shelf in 1970.
I've loaded quite a bit of 7mm Rem Mag. Its a big case that has a relatively small bore. Consider its a necked down 458. IMR4895,if I'm not mistaken,is a good burn rate in a .458.
I'm not saying you can't use 4895. You can. Generally,if they bother to publish data,it will work. I would not push the upper limit. Settle for "Enough" Things can spike suddenly with big cases and quicker powders.
I never loaded 140 gr bullets. I generally used 160's. Some 150 Ballistic Tips. The 150's like IMR4350. I used H-4831 for the 160's H-1000 for 168's.
Reloader 19 and Reloader 22 work about equally well.