UMMMMMMMMM, NO, Most of those rifles were re barreled several times during their service lives. They received the latest barrels available each time. The twist rates didn't vary to my knowledge but the bullets issued by the Swedes DID.
The Swedes switched to a 140 grain boat tail design around 1941. They also changed the rear sights on some of their rifles when they were fitted with shorter barrels, M96/38.
Some of these rifles will have "data" either pasted or nailed to the right side of the butt.
OP, you state your rifle has been sporterized. Not that it really matters. The thing is, you don't mention if you're shooting iron sights or a scope. If irons, they will be for the 140 grain bullet and you will have to do some shooting to familiarize yourself with their performance.
Norma loads the 160 grain round nose projectiles at the same velocity the Swedish military did but with different powders.
The Swedes used a BOFORS made powder that went by the designation #44. It was the same as or similar to IMR 3031. They loaded 34 grains of this powder under their 160 grain bullets for a velocity of 2200fps out of the M94 Carbine and 2300fps out of the M96, M38 and Ag42B semi auto rifles. It was my understanding that one of the main reasons for standardizing on the 139 grain SBT bullets was feeding the Ag42B semi auto. I'm not really sure but it would make sense as well as the possibly better trajectory of the new bullet.
Varget is slightly slower than IMR3031. I haven't used it in the Swede as I prefer IMR7828SSC.
I have used H4831 and the old #44 powder which I loaded to the military specs. Back in the day, surplus 160 grain cupro nickle round nose bullets and loaded cartridges were available from International Firearms out of Montreal.
I bought thousands of each, as well as wooden tipped cartridges to cannibalize the excellent pistol powder they contained, fill the cases with surplus powder/bullets. I pulled the bullets and weighed the powder. That's where I got the 34 grain load. My records show appx 2300fps from my M96 at the time.
A starting point of 34 grains of Varget should be close to the military velocities.
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