#### Abolt

##### Well-Known Member

I have a 300 wsm with a bartlein 26" barrel. I tested some Hornady 150g btsp and h4350. When I loaded these up I used the data from the Hornady book, after looking tonight I noticed they are 3 grains heavier than my other books I have. I'm wondering if my chronograph could be off or if anyone has any other ideas.

My load:

Norma 300 wsm case

Hornady 150g btsp

Col .010 from lands

Federal gm215m

H4350 67g, 68g, 69g, 70g, 71g.

Here are the velocitys:

67g: avg: 3184 sd: 7.54

3181

3176

3190

3192

68g: avg: 3339 sd: 30.74

3303

3351

3375

3329

69g: avg: 3386 sd: 13.95

3374

3396

3374

3400

70g: avg: 3370 sd: 11.15

3361

3364

3370

3386

71g: avg: 3465 sd: 8.85

3475

3471

3459

3457

Looking at these numbers velocity is considerably higher than book values. The 71g load is pushing RUM numbers. Here is a picture of one primer from each group. 67g bottom left and 71 top right, cannot get the picture to rotate. Also the 100 yd group of the 71g. .377" first 3 and .54" overall. It seems to have potential.

My load:

Norma 300 wsm case

Hornady 150g btsp

Col .010 from lands

Federal gm215m

H4350 67g, 68g, 69g, 70g, 71g.

Here are the velocitys:

67g: avg: 3184 sd: 7.54

3181

3176

3190

3192

68g: avg: 3339 sd: 30.74

3303

3351

3375

3329

69g: avg: 3386 sd: 13.95

3374

3396

3374

3400

70g: avg: 3370 sd: 11.15

3361

3364

3370

3386

71g: avg: 3465 sd: 8.85

3475

3471

3459

3457

Looking at these numbers velocity is considerably higher than book values. The 71g load is pushing RUM numbers. Here is a picture of one primer from each group. 67g bottom left and 71 top right, cannot get the picture to rotate. Also the 100 yd group of the 71g. .377" first 3 and .54" overall. It seems to have potential.