FWB 300S vintage target air rifle: Part 5
by B.B. Pelletier
The FWB 300S is considered the gold standard of vintage target air rifles.
This is a test I said I would do the next time I got a calm wind day at the range. That day came last Friday, and I took the opportunity to test the FWB 300S at 50 yards with a scope. This test was designed to see if there is any discernible accuracy difference between pellets that are sorted by weight and those selected at random from the tin. If you read part 4, you’ll see that I was surprised to find that these JSB Exact RS pellets I selected for their accuracy had such a variation in weight. I sorted through almost 40 pellets to find 20 that weighed exactly 7.3 grains. Though the weight difference was only four tenths of a grain, it was more than expected and more pellets were affected than I thought.
The JSB Exact RS pellet was chosen because of previous performance demonstrated in part 3. And I had to choose a domed pellet because out at 50 yards no wadcutter can possibly be accurate — I’ve proven that on many occasions in the past.
In part 4, I tested the rifle at 50 yards using the target sights that come on it, and I got two groups of 10 shots each. One was with random pellets taken from the tin. That group measured 1.689 inches between the centers of the two widest shots, while the other was 10 weight-sorted pellets that grouped in 1.363 inches. I didn’t feel that test was conclusive, so I wanted to return with the rifle scoped to see what it could do.
Not only did I mount a scope on the rifle, I also installed a scope level, and on every shot the bubble was leveled. That eliminated the possibility of any cant, so the rifle was always shooting in the same orientation.
The scope hangs over three-quarters of the loading port, making loading a chore. Notice how close together the scope rings are, yet they occupy the entire length of the dovetails. The 300S is not made for a scope! Notice, also, the scope level that was consulted on every shot.
I mounted a Leapers 3-9×50 scope with AO. It’s an older version of the one I linked to, but the specs are mostly the same. Notice in the photo that this scope was almost too long for the rifle, even though it was mounted at the extreme rear of the spring tube.
Where I had used a 3-inch bull target with the aperture target sights, I switched to the smaller 10-meter target when using the scope. The pellets were falling off the target paper anyway and onto the plain backer paper attached to the target frame, because of the large drop of this pellet at 150 feet.
I couldn’t have asked for a better day in which to shoot. Since I was at the range very early, there was absolutely no breeze. The sun hadn’t risen very high, so I didn’t need to shield my non-sighting eye. The rifle rested in the bunny bag dead calm, so altogether this was as perfect a test as I could have run.
Bore already seasoned
Because the bore had been shooting JSB Exact RS pellets last, it was already seasoned for this test. Still, I did shoot the rifle a few times to wake up the action. Then, I began the first group of unsorted pellets.
This time, the pellets did very poorly — grouping 10 shots into 3.152 inches at 50 yards. The group is very elongated, looking like a large velocity swing. The group measures just 1.178 inches wide, which is less than half the height.
Next, I shot the pellets that were sorted by weight. Ten went into a group measuring 1.606 inches across. This group is fairly round and well-distributed, so it makes me wonder all the more about the first group. Perhaps the gun needed longer to warm up for the first group than I allowed?
Test is not conclusive
I’m declaring this entire test invalid. I think I’ve stretched the FWB 300S beyond its capability, and the results are not telling me what I need to know. I’m aware that others have shot 10-meter rifle at 50 yards and say they’ve gotten good results, but clearly I’ve not been able to do the same with this rifle.
I think the test itself is worth pursuing, but with a rifle better-suited to accuracy at 50 yards. Pushing the FWB 300S outside its comfort zone was not a good idea. But I have several accurate air rifles that are all capable of grouping well at 50 yards. That’s what I need to rerun the test.