22 PPC USA

 

The following data was developed in a Sako S491 rifle that started life as a 223 Remington. We received a shipment of Norma 22 PPC USA brass, and we did not have any rifle to try it in. And as we have a number of these Sakos in 223 Remington, we decided to see if we could just open the bolt face to take the larger head size.

It actually was easier than we thought. We originally thought we might have to modify the extractor to make it work, but as it turned out that was not necessary at all. The original extractor worked without any modifications.

As soon as we opened up the bolt face, we realized that we did not have any suitable barrel to put on it!

Well, we already have the original factory barrel in 223 Remington. We decided to cut part of the chamber off, and just run a 22 PPC USA reamer into it, and try that one as a temporary measure. The final result looked a bit funny, but it shot fine. In fact, we found out that the same barrel with a 22 PPC USA chambering was more accurate, than the original factory chamber of 223 Remington. I do not want to start an argument whether the 22 PPC USA is more accurate than the 223 Remington. I would just attribute the better accuracy to a better chamber. As our reamers are all made to minimum SAAMI specs. Also, I cut the chamber to where the bolt would close on a new case, but not on the GO gage. This seems to work fine with our lot of brass, but might not work with a slightly oversize brass.

We used Norma brass and the Federal 205M in all the following loads. All bullets were molly coated, and the groups are for 5 shots at 100 yards. All the following loads were developed after a brand new stainless steel barrel was installed on the rifle. The barrel is from Hart, # 4 , and finished at 26 inches. A Leupold 8.5-25 X scope was installed in Leupold mounts.

Norma brass and the Federal 205M primers were used. All groups are 5 shots at 100 yards.

 

POWDER

VELOCITY

GROUP

BULLET

23.0 VVN 130

3097

0.409

SIERRA 52 MK

 23.5

3160

0.260

 

24.0

3234

0.518

 

24.5

3296

0.412

 

25.0

3306

0.512

 

25.5

3369

0.500

 

26.0

3428

0.488

 

26.5

3493

0.531

 

24.0 VVN 133

3057

0.887

NOSLER 55 BALLISTIC TIP

24.5

3119

0.609

 

25.0

3168

0.424

 

25.5

3229

0.425

 

26.0

3289

0.525

 

26.5

3354

0.602

 

27.0

3422

0.873

 

30.0 RL 12

3433

0.508

40 BERGER MEF

30.5

3532

0.447

 

31.0

3598

0.832

 

31.5

3690

0.580

 

32.0

3746

0.726

 

 

 

 

 

 

 

 

 

 

POWDER

VELOCITY

GROUP

BULLET

27.0 VVN 130

3954

0.431

35 BERGER MEF

28.0

4127

0.616

 

28.7

4252

0.586

 

29.4

4356

0.460

 

30.1

4416

0.400

 

30.8

4521

0.294

 

31.5

4628

0.442

 

28.0 VVN 133

3900

0.476

 

29.0

4068

0.321

 

30.0

4192

0.267

 

30.7

4258

0.884

 

29.0 REL 7

4318

0.349

 

29.7

4466

0.416

 

30.4

4597

0.748

 

28.0 H 4198

4208

0.768

 

28.7

4317

0.831

 

29.4

4402

0.495

 

30.1

4503

0.728

 

30.8

4625

0.676

 

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Last updated August 26th, 2000