Below is the results of a test I did this past weekend. Very unscientific but I wanted to see how the velocity differed between different length barrels on some of my 7x57's. I used Sellier & Bellot 173gr and Norma 150gr factory loads.

For what its worth here are the results. I can't get my spreadsheet to copy in the same format so its kinda hard to follow. I would be glad to email the Excel spreadsheet to anyone interested.

Ammo
Bullet
Distance
Conditions
1st shot
2nd shot
3rd shot
Avg.Vel.
Firearm

Sellier&Bellot
173gr
100 yds
sunny - 60
2304
2324
2321
2316
Nowatny BRNO Mauser 20" bbl

Norma
150gr
100 yds
sunny - 60
2516
2556
2588
2553
Nowatny BRNO Mauser 20" bbl

Sellier&Bellot
173gr
100 yds
sunny - 60
2390
2357
2389
2378
Delorge Mauser - Douglas 22" bbl

Norma
150gr
100 yds
sunny - 60
2718
2716
2716
2716
Delorge Mauser - Douglas 22" bbl

Sellier&Bellot
173gr
100 yds
sunny - 60
2352
2327
2301
2326
Oberndorf Mauser Type B 24" bbl

Norma
150gr
100 yds
sunny - 60
2712
2661
2612
2661
Oberndorf Mauser Type B 24" bbl

Sellier&Bellot
173gr
100 yds
sunny - 60
2124
2507
2512
2381
HVA Custom - McGowen 24"bbl

Norma
150gr
100 yds
sunny - 60
2601
2570
2558
2576
HVA Custom - McGowen 24"bbl

Sellier&Bellot
173gr
100 yds
sunny - 60
2410
2425
2414
2416
Oberndorf Mauser Type A 28" bbl

Norma
150gr
100 yds
sunny - 60
2846
2775
2814
2811
Oberndorf Mauser Type A 28" bbl

Be patient, guys, I have Jeff's results...realy impressive....

This is the GUNSMITHING forum; it's illegal to post load results without including photos of the rifles - especially rifles like these.