Q: I recently worked up a load for my 7mm Rem Mag that gives me surprisingly good accuracy — three-shot groups measuring 19mm (.75”) at 100 metres from a benchrest. This, using a Sightron 3.5-10x scope, is as good as the best I’ve ever been able to get from factory ammunition (19mm groups with the Hornady 154gn SST load).
The question I’d like to ask you is what kind of velocity am I getting from my Model 700 Remington with 61cm barrel using the 120gn Hornady SP Tipped and 68gn of Reloder 22?
To play it safe, I worked up one grain at a time from 64 grains. Extraction and bolt lift were still easy, so I stopped right there.
Can you tell me what kind of velocity and energy I’m getting at the muzzle and out to 400 metres?
As one who has owned several rifles, some of which could only shoot one-minute groups with one load, I am constantly amazed at the ability of my Remington 700 to put both 154gn and 120gn bullets into such tight groups and only 144mm apart.
Harold D Brown
A: Your load of 68gn of RE-22 should be giving you approximately 1015m/s (3330fps) velocity. That’s what I got in my custom Mauser which had a 61cm (24”) barrel.
If you sight in 68mm high at 100 metres, the 120gn bullet will land 56mm high at 200 metres, zero at 250, and drop 95mm at 300m, and 420mm at 400.
Energy figures are 3308 joules (2440ft-lb) at 100 metres, 2717J (2004ft-lb) at 200, 2214J (1633ft-lb) at 300 and 1788J (1319ft-lb) at 400m.
You are fortunate in having a rifle that will place both light and heavy bullets so close together and still give such fine accuracy. By all means hang on to it!
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